View allAll Photos Tagged CrescentNebula
La nébuleuse du Croissant, dans la constellation du Cygne à 400 mm (équivalent à 600 mm en 24x36, mais ensuite recadré à environ 900mm): 10 photos, 3 Darks, 14 Offsets ; 11 Flats. Assemblage dans IRIS et cosmétique dans Photoshop CS4. Nikon D5300 modifié astro par Eos for Astro, Nikkor AF-S 200-400mm F/4, télécommande Twin1 ISR2 + Monture Astrotrac 320x+ filtre IDAS LPS-D1-N
Paramètres: 10x 120s F/4.5 ISO 3200, 400mm.
Série prise le 24.8.2017
The Crescent Nebula
I spend to this project a second session with 30 240-sec. frames on a night with 1/3 moon. Added the 12 frames from a another session to the new 30 frames and stacked again...
Canon EOS 700Da
HEQ-5
GPU
TS-Photon 154/600 Newton
50/180 Guiding Scope
ASI 120 MM mini
Kstars/Ekos/INDI
42x 240sec RGB
15x Dark
20x Bias
20x Flat
Optolong L-eNhance Dualband Narrwband Filter
Siril v0.9.11-1:
Processing: Photometric CC
Processing: Histogram Transf.
Processing: SCNR
Gimp:
Stretch, Sharpening, Denoise, Color Correction ...
150/750 PDS, canon 1100d modificada, filtro UHC optolong, 80x600"+7x1200", autoguiado con buscador 9x50+spc900nc, procesada con pixinsight, Photoshop y lightroom.
No me convence el filtro UHC, parece que complica bastante el procesado
Crescent nebula is an ionized gas nebula about 5000 light years from Earth.
⏱️ 6h (93 x 4min ISO 800 frames)
Kaunas, Lithuania (Bortle 8 skies)
📅 September, 2021
Setup:
📷 Canon EOSR unmodified
🔭 Skywatcher Explorer 150PDS
️ Baader MPCC and IDAS LPS-D2 filter
⚙️ Skywatcher HEQ5 Pro
↖️ Guiding with ZWO ASI 120MM Mini + ZWO 30mm Mini Guide Scope + PHD2
💻 Stacked and edited with DeepSkyStacker and PixInsight
NGC 6888 also known as the Crescent Nebula in the constellation Cygnus. This is a clipping of a wider view of the area and consists of 15 x 60 second exposures at ISO 3200. Equipment used was a Canon 6D, Canon EF 400mm f/5.6L USM lens mounted on an iOptron ZEQ25 mount. I'll post the full-frame view at another time.
The Crescent Nebula (NGC6888) lies in the constellation Cygnus the Swan. This “cosmic bubble” in space owes its striking appearance to a central Wolf-Rayet star that pushes the hydrogen and oxygen atoms outward. As the high-velocity wind of WR136 hits a slower-moving stellar wind that the star previously produced when it became a red giant, the collision produces a shock front and the shell of gas we see: NGC 6888. The interaction is so energetic, in fact, that it also produces X-rays. The Crescent lies some 5,000 light-years away and measures about 25 light-years across.
RGB taken with a QHY10 OSC and AT65EDQ, 8x600s
Ha taken with QHY23M & 11" EdgeHD+Hyperstar 10x300
OIII taken with QHY23M & 11" EdgeHD+Hyperstar 2x300
Northfield, OH
Oct 21, 23, 2022
Equipment--
Telescope: Explore Scientific ED 80, field flattener (no reducer), 480mm focal length
Mount: Sky-Watcher EQ6R-Pro
Camera: ZWO ASI204MC-Pro
Guide scope: Williams Optics 50mm guide scope
Guide camera: ZWO ASI120MM-S
Software: NINA, PHD2
Imaging--
Lights: 46x300s
Darks, Flats, DarkFlats, Bias: assorted
Sensor temp: -10.0
Filter: Optolong L-Pro
Sky: Bortle 6 (nominal)
Post processing--
Software: PixInsight, Photoshop
This mosaic is a composite of 24 individual panels. Each panel is a stack of between 8 and 16 images shot as 245s exposures with a Celestron Edge HD 9.25" telescope at f/2.3 with HyperStar and Atik 314L+ color CCD camera. The images are pre-processed and stacked in Nebulosity. Each stack is then color calibrated and deconvolved in PixInsight. Microsoft ICE is used to make the mosaic. The mosaic then undergoes some cleanup in PixInsight, and final processing in PS CS 5.1. Images were taken over 8 different nights from 2012-2015, mostly from Mt. Pinos, CA.
The center of the image is at RA: 20h 19m 20.4s DEC: +39° 42' 4.8"; it covers a region of sky 3° 23' wide by 3° 8' high, and it is within 1° of being aligned with the cardinal directions. The bright star toward the upper left of the image is Sadr, or γ Cyg, a supergiant F8Iab that is nearing the end of its life. In the sky, it is surrounded by clouds of hydrogen that make up the emission nebula, IC 1318. This area of the sky also contains many dark molecular clouds, including Barnard 343 in the upper right of the image. The two open star clusters that stand out most are NGC 6910, above and to the left of Sadr, and M29 (NGC 6913) - the only Messier object in this shot, in the lower left corner. In the lower right corner is NGC 6888, the Crescent Nebula. This is where I began constructing this mosaic, in June 2012. The Crescent Nebula is a shell of hydrogen puffed into space from the outer layers of a very massive star. The remaining portion of the star glows with high intensity from helium fusion that ionizes the gas around it. This is a Wolf-Rayet star, and, like Sadr, it will end its life as a supernova. This portion of the galaxy will undergo radical changes in appearance due to the violent evolution of massive stars over the next few million years.
The Crescent Nebula (NGC6888) lies in the constellation Cygnus the Swan. This “cosmic bubble” in space owes its striking appearance to a central Wolf-Rayet star that pushes the hydrogen and oxygen atoms outward. As the high-velocity wind of WR136 hits a slower-moving stellar wind that the star previously produced when it became a red giant, the collision produces a shock front and the shell of gas we see: NGC 6888. The interaction is so energetic, in fact, that it also produces X-rays. The Crescent lies some 5,000 light-years away and measures about 25 light-years across.
The Crescent Nebula (NGC6888) lies in the constellation Cygnus the Swan. This “cosmic bubble” in space owes its striking appearance to a central Wolf-Rayet star that pushes the hydrogen and oxygen atoms outward. As the high-velocity wind of WR136 hits a slower-moving stellar wind that the star previously produced when it became a red giant, the collision produces a shock front and the shell of gas we see: NGC 6888. The interaction is so energetic, in fact, that it also produces X-rays. The Crescent lies some 5,000 light-years away and measures about 25 light-years across.
The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by William Herschel in 1792.[2] It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000[3] to 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures.
The red in this photo is Hydrogen alpha (Ha) gas and the blue/teal is O111 (oxygen 3) ozone.
Photographed 5K years later, Sept 04 & 05 2021 Alexander Valley, Sonoma County, Calif
OBJECT: NGC 6888 Crescent Nebula
Scope: SVX130T 935mm f/7
Camera: ASI2600MC
Mount: EQ6R
Filters: L-Extreme
Moon Phase: 4% waning
Lights: 36 @ 150” 100 gain, -10deg on 09-04-21
60 @ 150” “ “ on 09-05-21
Darks: 30 @ 150” Library
Flats: 30 @ 3.5” MF
Dark Flats: 30 @ 3.5” MDF
Notes: Multi night shoot. Hazy smoke, clear, calm, 60’s temp, 40’s RH
NGC6888/Crescent Nebula in Cygnus.
Love this nebula especially in narrowband - otherwise there are a huge amount of stars in the area and they really get in the way of imaging. :P
This image is hydrogen alpha only, it's done with a canon DSLR 350D using astronomik ha 12nm clip-in filter, and SkyWatcher ED80 scope riding on EQ6 :)
Could do with more data but for now i'm pleased with how well the 350D handled narrowband imaging.
The Crescent Nebula, NGC 6888, is 5000 light years away. Captured in 7.5 hours of exposure on 2024-06-17 & 23 under a Bortle 7 sky in Austin, Texas. A HOO palate OSC NB image.
At its center is a heavy metal Wolf-Rayet star, shedding its outer layers at high velocity to collide with earlier slower moving stellar wind. This results in both inward and outward moving shock waves and the spectacularly complex structure we see here.
WO RedCat 250/51mm, L-Ultimate dual NB filter, ASI533 MC camera, ASIAIR Plus controller, SW AZ-EQ5 mount.
Processed in PixInsight, 90 5' exposures w darks, drizzle stacked, Auto DBE, then SPCC, RC-Astro Noise/Blur/StarXTerminator plugins, Star Stretch, and Affinity Photo final exp and crop
The Crescent Nebula is an emission nebula in the constellation Cygnus. It is about 4,700 light years away and is formed by a fast stellar wind from the star HD192163. The star is shedding its outer envelope, ejecting the equivalent of our Sun's mass every 10,000 years. The stellar wind is colliding with and energising, a slower-moving wind ejected by the star when it became a red giant around 400,000 years ago. The result of the collision is a shell about 25 light years across. The central star will probably undergo a supernova explosion in the next million years. (Source: Sky Safari)
Taken with my William Optics FLT91 telescope with F6AIII 0.8x reducer, in my backyard at Bortle 5 skies.
Camera: ZWO ASI2600MC Pro with Optolong L-Ultimate 2" filter
Mount: ZWO AM5 with ASIAir Plus
Software: PixInsight, Affinity Photo2, NoiseXTerminator, StarXTerminator and BlurXTerminator
Integration time: 4h 10m
HOO version: flic.kr/p/2oKGQTQ
More acquisition details: astrob.in/8he66h/0/
Skies have been cloudy around where I live, so I have reprocessed, and cropped to focus on the nebula, clarified and SHO-like palette version of the wider-field photo taken with:
* William Optics FLT91 with F6AIII 0.8x reducer
* ASI2600MC Pro with Optolong L-Ultimate 2" dual-band narrowband filter
* ZWO AM5 mount with ASIAir Plus
* Processed with PixInsight and Affinity Photo 2
* integration time 4h10m
See wide-field photo here: flic.kr/p/2oKGQTQ
Fujifilm X-T10, Samyang 135mm f/2.0 @ f2.0, ISO 1600, 40 x 60 sec, tracking with iOptron SkyTracker Pro, stacking with DeepSkyStacker, editing in GIMP, taken July 31 under Bortle 3/4 skies. Conditions seemed about perfect, Sadr was nearly directly overhead, and my focus was dead-on, making processing simple.
Notable nebulae contained in this extent are the Gamma Cygni Nebula around Sadr and the Crescent Nebula near the center.
Taken on my third consecutive night of astrophotography - I'm not going out tonight despite the likely clear skies - I need a break.
Aug. 2 update: A re-edit, this time without a luminance layer - makes the reds less pink.
I used a stack of 13 4 minute exposures for the RGB component, and a stack of 20 3 minute hydrogen-alpha exposures as an enhancement for the red channel. I'm not sure what I was thinking when I was shooting emission nebulae without the Hα layer - the amount of detail it brings out is pretty incredible.
We're all waiting for the next supernova in the Milky Way. It's been centuries since the last one visible to the naked eye (unless you count 1987A - but that wasn't in the Milky Way). We've all read about Betelgeuse and Antares, but the star at the center of the Crescent Nebula, WR 136, is a lot closer to exploding than either of those red supergiants. The gas you see is the former outer layers of the star, meaning it has already passed through its red supergiant stage. WR 136 is a Wolf-Rayet star, and it is very near the end. Maybe it won't appear in the sky in our lifetimes, but at some point, this star that has already shed its hydrogen envelope will brighten by an enormous factor as its core collapses and blasts the remaining outer layers of the star into space.
Telescope: Celestron Edge HD 925 at f/2.3 with HyperStar
Cameras: RGB shot with an ATik 314L+ from the dark skies of Mt. Pinos
Hα shot with an Atik 414-EX and Atik Hα filter from my light polluted backyard
Preprocessing in Nebulosity; stacking, channel combination, and processing in PixInsight; final touches in Photoshop
The spectacular region of sky around the Carina Nebula, NGC 3372, in Carina, with its adjacent nebulas and open star clusters. NGC 3532, the Football Cluster is at left, while NGC 3293, the Gem Cluster, is at upper right. At far right is the ear-lobed shaped Crescent Nebula, NGC 3199, a remnant of a Wolf-Rayet star and its stellar winds.
This is a two-panel mosaic, with each panel a stack of 4 x 6-minute exposures with the Borg 77mm f/4 astrographic refractor and filter modified Canon 5D MkII at ISO 1600. Stitched in Photoshop. Shot April 3/4, 2016 from Tibuc Cottage, Coonabarabran, NSW, Australia. Autoguided with the SBIG SG-4 guider.
The heart of Cygnus is a region rich in H-alpha and details, the image is a night-sky scape of that region and the Crescent Nebula can be seen in the upper central part to the right of the image My first time using the Redcat 51 and a Nikon Z6II. I am in love with both, Redcat for stellar optics and Z6II for quality and ease! Moon had risen during the last 3 hours of session in 'waning crescent' phase but exposures just got a bit brighter but stack was great in the end. I had preferred to start with a ISO 1600 not 3200 so that it doesn't get over exposed after moon rise! Image was taken on the 2nd of July, Deep Sky Stacker, Starnet ++ and Photoshop 2021 were used in stacking, processing and editing the image.
Nikon Z6II
Redcat 51
ISO 1600
187x120"
187 Light Frames
10 Dark Frames
75 Flat Frames
75 Bias Frames
NGC6888 - The Crescent Nebula, an emission nebula in Cygnus. LRGB image - data captured over the course of the first week in September 2014
NGC6888, Caldwell 27. Taken between 25th and 28th August 2021.
The Crescent Nebula gets its shape as a result of an ageing star losing mass extremely quickly. Such a star is called a Wolf Rayet star and this one which is at the centre of the nebula will probably go supernova. According to the Sky at Night magazine this violent and rapid ejection has produced a dense shell of scorching hot material that gives the nebula its shape, while the complex structures seen within the bubble are likely the result of stellar winds colliding and interacting with older material ejected by the star long ago.
H: - 85 x 180s (4.25 Hours)
O: - 85 x 180s (4.25 Hours)
Total Integration = 9 hours.
Flats taken with a PURElite CFPL22 Ultra-Thin LED Light Box. Darks and Dark Flats taken afterwards and kept for future.
Telescope: - Skywatcher 130PDS Newtonian. Flocked with the shiny parts painted matt black. Additional camping mat protection from dew. Focuser upgraded with a ZWO EAF (Electronic Auto Focuser)
Camera : - ZWO ASI294MM with a ZWO 1.25” Electronic Filter Wheel
Filters:- Baader Mark-III MPCC Coma Corrector. Baader 7nm Ha and 8.5nm OII narrowband.
Mount: - Skywatcher EQ6R.
Guiding: Skywatcher EvoGuide 50ED & ZWO ASI120MM-Mini.
Controlled by an ASIAir.
Processing Software: Stacked in Deep Sky Stacker and edited in Star Tools and Denoise AI.
Moon: Pretty much full.
Light Pollution and Location: - Bortle 7/8 in Davyhulme, Manchester. Different websites tell me different things about this. It all depends on the time of night and which way I am pointing.
Weather: - High pressure but sitting horribly to the northwest of the country dragging lots of bitty cloud down from the north. Not ideal but dry enough to get a few days’ work in.
Notes: This is my first astrophotography project of the year having become a father at the start leaving me no time to do anything but be tired.
I wanted to go mono but to also make life easier and quicker, so I have invested in an auto focuser and the specialist astrophotography computer ASIAir. This has done the trick, polar alignment is extremely easy and then the rest can be automated so long as the focus is close. I like the way the Asiair automatically moves the mount into position when polar aligning, SharpCap relied on me rotating the mount which could have been inaccurate. It’s been a learning curve, especially getting the flats right but its quite intuitive and I think I am just about there.
Trying to get the colour somewhere near what I wanted it has been challenging too. I reprocessed this image several times.
During the off months I did spend time on upgrading my 130PDS to be very close to an astrograph. I flocked the inside, painted the shiny parts matt black, added more dew protection with camping mat material and covered the light leakage in the focuser with blue tac. I also used a laser collimator which I combined with my collimation cap to get the collimation right. One day I might add a fan to the primary mirror.
I got lots of hours in on this but would be tempted to reduce this in future to get more photos.
This is the Crescent Nebula in Cygnus, aka NGC 6888.
Flippin' stars! Never seen so many. This is 9 x 1200 second subs in Ha with the cooled mono 450D, total 3 hours. Hopefully I'll be able to add some Olll in the not too distant future, and give it some pretty colour. I might also add some more Ha eventually, to cut down on some of the noise, but don't hold your breath :)
Preprocessed and stacked in Nebulosity, processed in CS5
NGC6888 and PN Ju 1 in Cygnus
The Crescent Nebula (NGC6888) is one of scores of spectacular nebula in the nebula rich region of Cygnus. The egg shaped nebula is formed by two stars with their interacting mass ejections. One star, a red giant, is shedding it's cooler and hydrogen rich outer mass layers. This slowly expanding ejecta is glowing from the much hotter and faster moving shock wave of translucent blue-green gas cast off from a rare Wolf-Rayet star. Wolf-Rayet's are some of the hottest stars known, and are very unusual in their ability to fuse heavy elements...The WR's high speed and hot shock wave impacts the red giants slower cooler hydrogen and produces the additional bright glow of the nebula.
Also visible to the left of the Crescent is the Soap Bubble planetary nebula (PN Ju 1 also officially PN G75.5+1.7), further described the Soap Bubble Nebula. This planetary nebula was discovered by amateur astronomer Dave Jurasevich in 2008, and remains a very elusive target. It is best imaged in O-III and as a likely planetary is possibly produced by a sun like star in its final phase of life.
Processed as a modified HOO-LRGB composition using AstroPixel Processor, PixInsight, Affinity Photo and Topaz DeNoise AI processing software. The nebulae are shot entirely in narrowband Hydrogen alpha and Oxygen III over several months from Dec 2021 to May 2022 with further star color & detail added, using a WO FLT91 refractor at its prime 540mm focal length with a ASI2600MM Pro camera (at bin1x1, cooled to -5ºC, gain100) and Chroma 5nm H-a and 3nm O-III and Chroma LRGB filters all mounted on a TTS-160 Panther alt-az mount and TTS-rOTAtor field derotator. Total integrated exposure time is just over 5 hours. Guiding control software is PHD2 through a WO RC51 and ASI290MM mini camera. Sequencing, focus control and calibration frames using N.I.N.A., a PLL-SS2 robotic focuser and TTS-HP robotic mount control app (in testing).
Well heavens above - two clear nights on the bounce. I'd forgotten how to do this stuff ;)
My first guided image! :) The Crescent Nebula in Cygnus, a mere 5K light years away.
Bought a modded Quickcam Pro4000, with the adaptor to fit it to the SW 9x50 finder scope, from Badgers/Anton on SGL. Then did the EQ5 handset mod using the kit from Shoestring Astronomy, downloaded PHD and voila. Total cost £90 - can't be bad :) Not perfect of course, but then it was never going to be with an EQ5 and rubbish motors. There was some evidence of wispy bits around this, but it looked more like discolouration, so I took it out - probably expecting too much :)
SW 200p/EQ5
Nikon D70 modded, iso 1600, Baader CC and Neodymium filter
40 x 5 mins for a total of 3 hours 20 minutes
Guiding: Quickcam Pro4000/9x50 finderscope, PHD
Stacked in DSS and processed in CS5
Emission nebula in Cygnus formed by the fast stellar wind from the central massive Wolf-Rayet star colliding with and energizing the slower moving wind ejected by the same star from an earlier phase of its life.
Bit late for a summer target but it was nice to get this one in on the run of clear nights we had towards end Sept, early Oct 2011. Although it was a pretty good run of nights the transparency wasn't great overall and there was a fair bit of moisture in the air. Not a great time for my dew controller to break down - the hairdryer had to be deployed to keep it under control !
Might frame this to get the soap bubble (at mid top of frame) more in next year, but only found out about that object after I'd shot it!
Tech details below:
TMB 92ss + Borg DG-L .85x reducer @ F4.7
Mount - EQ6
Starlight Xpress SXVR-H18 @ -20 degs
QHY5 PHD guiding, guidesope Meade 127
Ha - Baader 7nm
- 15x12min
OIII - Baader 8nm
- 15x12min
SII - Baader 8nm
- 15x12min
9 hours total
HST mapping
Red - SII
Green - Ha
Blue - OIII
Captured in Nebulosity 2
Calibration, stack and DDP in Images Plus
Curves + all other processing PS CS3
NGC 6888 Crescent Nebula surrounded by Gamma Cygni nebulosity.
This is an HaRGB image (H-alpha frame blended into the red channel and added again as a luminance layer).
Details here:
La constellation du Cygne à 45mm (équivalent à 67mm en 24x36): 8 images... Sur 20 produites, mais 12 ont dû être rejetées pour cause de formation de buée DANS l'objectif: celui ci n'est pas étanche, à cause du mécanisme de bascule et décentrement... La prochaine fois, je l'emballerai dans un sac plastique. Autre problème: la mise au point glisse, à cause du poids de la lentille frontale: il faut prévoir un dispositif de blocage. 3 Darks, 10 Offsets ; 15 Flats. Assemblage dans IRIS et cosmétique dans Photoshop CS4. Nikon D5300 modifié astro par Eos for Astro, Nikkor PC-E 45mm F/2.8, télécommande Twin1 ISR2 + Monture Astrotrac 320x+ filtre IDAS LPS-D1-N
Paramètres: 240s F/3.2 ISO 800, 45mm.
Série prise le 28.7.2017
Légendes: www.flickr.com/photos/achrntatrps/albums/72157684543776386
Massive stars lead short, spectacular lives. This composite X-ray (blue)/optical (red and green) image reveals dramatic details of a portion of the Crescent Nebula, a giant gaseous shell created by powerful winds blowing from the massive star HD 192163 (a.k.a. WR 136, the star is out of the field of view to the lower right).
After only 4.5 million years (one-thousandth the age of the Sun), HD 192163 began its headlong rush toward a supernova catastrophe. First it expanded enormously to become a red giant and ejected its outer layers at about 20,000 miles per hour. Two hundred thousand years later - a blink of the eye in the life of a normal star - the intense radiation from the exposed hot, inner layer of the star began pushing gas away at speeds in excess of 3 million miles per hour!
When this high speed "stellar wind" rammed into the slower red giant wind, a dense shell was formed. In the image, a portion of the shell is shown in red. The force of the collision created two shock waves: one that moved outward from the dense shell to create the green filamentary structure, and one that moved inward to produce a bubble of million degree Celsius X-ray emitting gas (blue). The brightest X-ray emission is near the densest part of the compressed shell of gas, indicating that the hot gas is evaporating matter from the shell. The massive star HD 192183 that has produced the nebula appears as the bright dot at the center of the full-field image.
HD 192163 will likely explode as a supernova in about a hundred thousand years. This image enables astronomers to determine the mass, energy, and composition of the gaseous shell around this pre-supernova star. An understanding of such environments provides important data for interpreting observations of supernovas and their remnants.
Image credit: X-ray: NASA/UIUC/Y. Chu & R. Gruendl et al. Optical: SDSU/MLO/Y. Chu et al.
Learn more/larger images: chandra.harvard.edu/photo/2003/ngc6888/
p.s. You can see all of our Chandra photos in the Chandra Group in Flickr at: www.flickr.com/groups/chandranasa/ We'd love to have you as a member!
NGC6888 "Crescent" Nebula. Supernova explosion remnants, among Milky Way stars in the background.
Image was taken during 13 observing nights in March/April 2009.
Canon 350Da(baader filter mod), 10" 1:4.7 Newton (F=1200mm)
EQ6PRO SynScan mount, 75mm refractor + QHY6 CCD as a guider
9 hours in H-alpha (Astrodon 6nm), 10 and 20 min. subexpositions mixed. ISO800
10 hours in O-III (Baader 8nm), 20min subexpositions, ISO800
34x2min @ISO200 unfiltered RGB for color stars field and "pseudo-continuum" substraction.
Light-polluted urban sky. About 4.0m visual limit. About 30% of h-alpha frames (10min subexposures) taken under the Moon.
Taganrog, Russia.
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155 exposures of 50 and 60 seconds were taken of the Crescent Nebula on 5-9 and 7-5-25 totaling 2 hrs 25 mins integration time.
Link to full resolution
www.dropbox.com/scl/fi/zqa36rsvl56di9zijg4k3/ngc6888c_155...
Equipment
Astrotech AT8IN, Televue Paracorr 2, Orion Atlas Pro Az-Eq G, Orion 50mm Guide Scope, QHY5III678M guide camera, Ogma AP26CC cooled camera
Software
Astro Photography Tool, PHD2, Stellarium, EQMOD, Siril, GraXpert
Emission nebula in Cygnus formed by the fast stellar wind from the central massive Wolf-Rayet star colliding with and energizing the slower moving wind ejected by the same star from an earlier phase of its life.
The recently discovered soap bubble planetary nebula is also faintly visible at mid top of frame - see note. By way of interest, here is a link to the story of its discovery, using amateur equipment
www.starimager.com/Image%20Gallery%20Pages/Hydrogen%20Alp...
This image is a natural colour mapping version of last year's data + also some star colour I had from the Canon 450D
The original HST mapped version here:
www.flickr.com/photos/42731607@N08/6320008406/in/photostream
Tech details below:
TMB 92ss + Borg DG-L .85x reducer @ F4.7
Mount - EQ6
Starlight Xpress SXVR-H18 @ -20 degs
QHY5 PHD guiding, guidesope Meade 127
Ha - Baader 7nm - 15x12min
OIII - Baader 8nm - 15x12min
SII - Baader 8nm - 15x12min
9 hours total
Captured in Nebulosity 2
Calibration, stack and DDP in Images Plus
Curves + all other processing PS CS3
Can you believe that one star created all this? This is an emission nebula called the Crescent and is found in the constellation Cygnus. It was formed by the fast stellar winds from a massive, very energetic dying Wolf-Rayet star colliding with and energizing the slower moving winds it ejected at an earlier time. That resulted in a shell and two shock waves, one moving outward and one moving inward. I processed this image showing the real colours of the emissions. I used my processing technique which I call ‘Spectral Palette’ using Hydrogen-alpha (Ha) in red close to its actual wavelength, Oxygen (OIII) as a green/blue close to its wavelength and Hydrogen-beta (Hb) as blue close to its wavelength. The gold colour is a combination of Ha and OIII. When you add red and green light, you get yellow. The bluish green is ionized oxygen. The Hb adds blue to the red background nebulosity giving a more fuchsia richer colour.
Technical details:
Telescope: Ceravolo300 at F/4.9
Camera: SBIG Aluma 694
Filters: Astrodon
RGB for stars: 2.6 hours each
Ha: OIII: Hb: 6.5: 6.6: 6.5 hours
Location: private observatory, BC, Canada
Processed in Pixinsight and PS
The Crescent Nebula is a cosmic bubble about 25 light years across, blown by the winds from its massive central star, visible within the nebula. This star, a Wolf-Rayet star (WR 136), is shedding its outer envelop in strong stellar wind while also burning its remaining fuel at a prodigious rate. Nearing the end of its stellar life, this star should eventually explode as a spectacular supernova. In the meantime, the nebula itself, which is about 5,000 light years from earth, exhibits complex structures that are likely the result of the strong stellar wind interacting with materials previously ejected from the same star. (Narrative adapted from the APOD of 10th June 2016)
This view captures the reddish emission from hydrogen atoms as well as the bluish emission from oxygen atoms.
--------------------------
This image has been produced from the same data set of a previously posted image:
www.flickr.com/photos/theordinaryphotographer/48096457891...
August 28, September 1-3, 2018
from Fremont, California
(from home!)
Ha: 10 x 20 min
OIII: 12 x 20 min
Narrow band data only (no LRGB added)
(Total integration time of 7.3 hours)
(all binned 1x1)
QSI-690
AT6RC with field flattener
The crescent nebula in Cygnus is a popular and easy target for amateur telescopes. A powerful, yet dying star called a Wolf-Rayet star is responsible for this formation of glowing dust and gas, and will end its life as a supernova.
This is a reprocessed version with a more natural mix of narrowband information, where red=Ha+24%SII, green=OIII, blue=OIII+15%Ha.
Takahashi Sky 90 at f/4.5
SBIG STL-4020M (remote guide head)
Takahashi EM-200
H-Alpha/OIII/SII: 18 x 20 minutes each channel
Processed with Maxim/DL, CCDStack, and Photoshop CS6
Largo campo - somma di 18 scatti da 8 minuti a 800 ISO. Strumenti: Canon Eos 350D mod.; Obiettivo Nikkor 50 mm chiuso a f/5.6 - Eq6 Pro Mount, 7dark, 25 flat. Località: Spinello (Fc). Data: 12/06/2010
Emission nebula in Cygnus formed by the fast stellar wind from the central massive Wolf-Rayet star colliding with and energizing the slower moving wind ejected by the same star from an earlier phase of its life.
Closer crop of the previous image here:
www.flickr.com/photos/42731607@N08/7184685292/in/photostream
Second processing of previous data, which appears more realistic from a color perspective.
22x3mn subs, darks, bias, flats
ISO 3200
Canon 7D modded Astrodon Inside
Canon EF 70-200mm f2.8L USM @ 70mm f4.0
Astrotrac unguided
Astronomik CLS filter
1st try with Iris as DSS did not succeed in aligning all frames
Post-processing in Photoshop
Red channel used as Luminance to increase nebulosity contrast
Cepheus Flare Complex is clouds in the left upper quarter of the frame between Cepheus and Polaris near the left upper corner.
We can see green trace of drifting comet C/2014 E2 Jacques near the left edge. Here is an image of the comet taken just after this.
www.flickr.com/photos/hiroc/15178257005/
equipment: Sigma 35mmF1.4 DG HSM "Art" and Canon EOS 5Dmk2-sp2, modified by Seo-san on Takahashi EM-200 Temma 2 Jr, autoguided with Takahashi FSQ-106ED, hiro-design off-axis guider, SX Lodestar, and PHD Guiding
exposure: 6 times x 30 minutes, 5 x 15 min, 4 x 4 min, and 6 x 1 minute at ISO 1,600 and f/4.0
site: 11,000 feet above sea level near Mauna Loa Observatory in Hawaii
Crescent Nebula
Skywatcher 200p on NEQ6 mount, with guiding and dithering.
Optolong CLS-CCD filter. ASI294MC Pro at -20C. 62 x 90 second exposures (1 hour, 33 mins) at Gain 121, Offset 30 , 15 dark frames, 15 flat fields, 30 dark flat frames.
The wind was quite strong again. 23/10/20
At the center of the Crescent Nebula is the Wolf Rayet Star, WR-136. Wolf Rayets are luminous-hot dying stars that shed massive amounts of energy and material into space. In the case of WR-136 the material is ejected at speeds of up to 3,000 kilometers per second. When the new material hits previously ejected material it lights up creating a bubble-like emission nebula. Currently the Crescent Nebula is 25 by 16 light years across.
The Crescent Nebula shows its true bubble-like shape in professional telescopes, but through small to medium-sized amateur telescopes one can only make out the brighter sections. The crescent shape of these brighter sections of the nebula provides its common name. WR-136 shines at the center of the nebula at magnitude 7.7 and is easily identified since the crescent wraps around it.
I only had a couple hours between sunset and the rise of a bright gibbous moon. But the sky was clear and transparent, and it would have been a waste not to spend the short time that I had at the telescope. The Crescent Nebula filled the time nicely.
To see additional astronomy drawings visit: www.orrastrodrawing.com
NGC 6888 - Crescent Nebula
The Crescent Nebula is an emission nebula in the constellation Cygnus and discovered in 1792 by William Herschel.
It is formed by fast stellar wind from HD 192163 (Wolf-Rayet star WR 136) colliding with and energising the slower moving wind ejected by the star when it became a red giant.
The result of the collision is a shell and two shock waves (one moving outward and on moving inward). The inward moving shock wave heats the stellar wind to X-ray-emitting tempartures
RA: 20h 12m 7s
DEC: +38° 21.3’
Location: Cygnus
Distance: 5,000 ly
Magnitude: 7.3
Other designations: Sharpless 105, Caldwell 27
Captured over two nights in 2018
Fiel Of view: 3.8 x 2.53 deg
Total acquisition time of 4 hours.
Takahashi FSQ-ED
Technical Details
Captured using iTelescope T20
Processed by: Nicolas ROLLAND
Location: New Mexico Skies Observatory at Mayhill, New Mexico (MPC H06)
Dates of Capture May 27th & 29th 2018
HA 120min 24 x 300 sec
OIII 60min 12 x 300 sec
SII 60min 12 x 300sec
Optics: Takahashi FSQ-ED 106 @ F5.0
Mount: Paramount PME
CCD: SBIG STL-11000M
Pre Processing in Pixinsight
Post Processed in Photoshop CC
The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105). A lovely, clear, moonless night - great conditions for London - inspired us to return to a challenging target to see if we could coax out some more detail. The last time we attempted imaging the Crescent Nebula was 3 years ago with lots of 75 second exposures. This time we gave it 3 hours of 5 minute exposures and, though there is still a lot of missing detail, it's a big improvement on previous attempts. One of these days we'll have to try imaging it with filters.
[Information from Wikipedia]
NGC 6888 is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by William Herschel in 1792. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures.
It is a rather faint object located about 2 degrees SW of Sadr. For most telescopes it requires a UHC or OIII filter to see. Under favorable circumstances a telescope as small as 8 cm (with filter) can see its nebulosity. Larger telescopes (20 cm or more) reveal the crescent or a Euro sign shape which makes some to call it the "Euro sign nebula".
036 x 300 second exposures at Unity Gain (139) cooled to -20°C
050 x dark frames
040 x flat frames
100 x bias frames (subtracted from flat frames)
Binning 1x1
Total integration time = 3 hours
Captured with APT
Guided with PHD2
Processed in Nebulosity and Photoshop
Equipment:
Telescope: Sky-Watcher Explorer-150PDS
Mount: Skywatcher EQ5
Guide Scope: Orion 50mm Mini
Guiding Camera: ZWO ASI120MC
Imaging Camera: ZWO ASI1600MC Pro
Baader Mark-III MPCC Coma Corrector
Light pollution filter
resti di supernova - Dati: 15 x 12 min. 800 Iso + 3 Dark + 25 flat e darkflat
Software: Iris e Photoshop CS2
Strumenti: ottica Takahashi FSQ106 f/5 su Skywatcher EQ6 pro - Canon 40D CentralDS.
Data e luogo di scatto: 04/08/2011 a Castelletta di Fabriano (An)
Temp. esterna: 18,0° C - temp. al sensore: - 2,0 ° C - Umidità 90%
Narrowband image of ngc6888 Crescent nebula.
Combined as HOO.
C14 edge working at F7.8.
EQ8 pro mount
Antila Ha 3nm filter
Baader OIII filter
Atik414ex ccd
Total 6.5hrs
Artemis capture
APP
Nebulosity
Topaz labs
Photoshop
The Crescent Nebula (NGC 6888 or Caldwell 27) is an emission nebula in the Cygnus constellation, about 5000 light years away. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray emitting temperatures.
Scope: Skywatcher ED80
Camera: ATIK 314L
Guiding: TS OAG9, SSAG
Filters: Baader LRGB + Ha
Total exposures: 8h
Location: Mt. Parnonas, Greece
Date: 9 & 10 Jul 2010
This is a one frame from a very large, 18-panels, mosaic of constellation Cygnus. More info in my blog: www.astroanarchy.blogspot.fi/2013/09/a-collection-of-imag...
NGC 6888 in HST-palette
Ra 20h 12m 7s Dec +38° 21.3′
The Crescent Nebula, also known as NGC 6888, Caldwell 27 and Sharpless 105, is an emission nebula in constellation Cygnus, about 5000 light years distance.
It is formed by the fast stellar wind from the Wolf-Rayet star, WR 136 (HD 192163), colliding to an slower moving wind ejected by the same star when it became a red giant, around 400.000 years ago.
The result of the collision is a glowing shock shell around the star. Apparen size of the shell is 18' x 12' and the real size is about 25 x 16 light years.
Image is in HST-palette, (HST=Hubble Space Telescope)
from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.
Star colors are mixed from the NB channels, Red=H-a, G=O-III and B= 85%O-III + 15%H-a.