View allAll Photos Tagged CrescentNebula
This peculiar object is results from two sets of stellar wind thrown off by a central star. These shells of material were ejected at different times and have travelled outward at different rates. They are seen here to be colliding and interacting. The nebula is about 15 light years across and lies at a distance of 5,000 light years.
This image was captured under high desert skies near Santa Fe, New Mexico, USA with a telescope of 12" aperture at f/4.5 and an electrically-cooled CCD camera. This bi-colored image was taken through hydrogen-alpha (red) and oxygen-III (blue green) narrow-band filters.
The Crescent Nebula NGC 6888
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Cygnus alone has so many Deep Sky Objects, you can spend many nights imaging all of them... My scope is a bit small for the Crescent Nebula really, but since there is lots of other nebulosity, I still find the picture quite interesting.
Guide graph looked really good last night. A good polar alignment and a well balanced scope/mount do make a huge difference...
EOS700 Da, William Optics ZS61, iOptron iEQ45pro. Guiding with a 60mm guide scope and a ZWO ASI 178MC.
23 lights, ISO1600, 360s
10 darks, 5 bias
DSS and Photoshop for processing.
#astro #astrofotografia #astrophotography #astrofotografie #dso #nebula #nebel #crescent #crescentnebula #ngc6888 #cygnus #schwan #milkyway #milchstrasse #sichelnebel #mondsichelnebel #canon #ioptron #williamoptics #zs61 #zwo #dsophotography #deepskyphotography #sterne #sternbild #stars #nightsky
This Brain-like nebula or Crescent nebula NGC 6888, is emission nebula about 5000 light years from Earth. Its located in Cygnus constellation. The nebula is an expanding shell of gases results from Wolf-Rayet star in the centre of the nebula. This hot powerful star produces a fast speed solar winds that collide with the older outer shell gases. The impact is energize and ionize the outer shell gases to glow up in Hydrogen and Oxygen emission lines (Red & Blue in colour respectively). Captured over 2 nights in HOO palette with total integration of 4hrs & 20min. Gear setup: ES 100 APO CF, iOptron GEM45 guided by ZWO mini guidescope and ZWO ASI120MM-S, EFW 5x1.25, Baader Ha 6.5nm & O iii 6.5nm filters, ZWO ASI1600MM pro cooled @ 0. Acquisition by APT, Stacked by DSS and processed by PS. For more image details, check my astrobin link: www.astrobin.com/8d6qec/
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.
Image credit: X-ray: NASA/UIUC/Y. Chu & R. Gruendl et al. Optical: SDSU/MLO/Y. Chu.
It's about 5000 light years away, among the clouds of nebulosity in the Cygnus constellation. The Crescent (or Euro Sign for the currency oriented) comprises a couple of shockwaves produced by the evolution of an energetic Wolf-Rayet star.
Tech Stuff: TV-85/Borg 1.08 flattener/ZWO ASI 533 MC / IDAS LPS-V4 nebula filter/RST 135E mount. Two hours of unguided 15-second exposures integrated and processed in PixInsight. I'm redoing targets which are situated over my house during the summer to enjoy the benefits of more recent technology I've added in the past year (including the strain-wave mount; the 533 camera; and AI processing tools). I'm happy with the way these are giving new life to my scopes including this Televue 85, my first home astronomy purchase. From my yard 10 miles north of NYC.
This is 2 hrs of 3 minute sub-images taken on Sep 26, 2021. Taken from a metro area with a QHY183c at -15C, an Optolong L-eNhance filter, an Astro-Tech AT60ED at F/4.8 and acquired and stacked in SharpCap 3.2 LiveStacking with dark substraction.
Sh2-105 (NGC 6888) and Sh2-101
the first few frames...
as of 24/09/2022: 96x5min (8h), Optolong L-eNhance, on
William Optics RedCat 51
ZWO ASI2600MC Pro
ZWO ASI120MM Mini Guide Camera
AsiAir Plus
AM5 Mount
Here is a view of the Crescent Nebula (NGC 6888 or Caldwell 27) in the constellation Cygnus. This is about the best I can get using a standard DSLR camera.
Tech Specs: Sky-Watcher Esprit 120mm ED Triplet APO Refractor, Canon 6D stock camera, ISO 3200, 60 x 60 second exposures with dark/bias frames, guided using a ZWO ASI290MC and Orion 60mm guide scope. Image date: November 10, 2018. Location: The Dark Side Observatory, Weatherly, PA, USA.
After a long break we had a string of nice nights for imaging in early August. Sadr, the brightest star in this image is the 2nd brightest star in summer constellation Cygnus and it is surrounded by a region of hydrogen and interstellar dust. The Crescent Nebula at upper left emerges as a vibrant magenta thanks to significant oxygen emitting blue light to blend with hydrogen's red.
Tech Stuff: Borg 55FL/ ZWO ASI 533 Mono/ RST-135E unguided /Astronomik NB filter set HA 30 second exposures X 50 min; SII 30 second exposures X 50 min; OIII 30 seconds X 80 min. From my yard in Yonkers, NY, imaged over 3 nights with SQM-L readings 18.2-18.8
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. 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[citation needed] 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. (courtesy Wikipedia)
Wolf–Rayet stars, often abbreviated as WR stars, are a rare heterogeneous set of stars with unusual spectra showing prominent broad emission lines of ionised helium and highly ionised nitrogen or carbon. The spectra indicate very high surface enhancement of heavy elements, depletion of hydrogen, and strong stellar winds. The surface temperatures of known Wolf–Rayet stars range from 20,000 K to around 210,000 K, hotter than almost all other kinds of stars.
Classic (or population I) Wolf–Rayet stars are evolved, massive stars that have completely lost their outer hydrogen and are fusing helium or heavier elements in the core.
In this image 3 narrow band channels, hydrogen alpha, hydrogen beta and oxygen III were color mapped to their precise hue values so this is not a “false” color image but shows the colors emitted by the nebula in these 3 wavelengths of light
Capture info:
Location: SkyPi Remote Observatory, Pie Town, NM US
Telescope: Orion Optics UK AG14 (14” Newtonian f/3.8)
Mount: 10 Micron GM3000
Camera: SBIG STXL 16200
Data:
Ha, HB, OIII 10 hours each
Processing: Pixinsight
Exifs
-Mount: skywatcher neq-6 goto with Rowan modification belt
-telescope: skywatcher 200/1000 F/5
-autoguiding: Asi 120mm
-total exposure: 3H20Min 40 X 5m
-Camera: canon eos 700d astrodon
-filter(s): astronomik CLS ccd eos clip
-other optic(s): baader coma corrector
-software : Siril / photoshopCC
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. It was discovered by Friedrich Wilhelm Herschel in 1792. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 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. (Wikipedia)
Narrowband image: 29/4 & 11/5/15
Oxfordshire, UK
4 Hours Total Exposure
Bin 1x1: 6x1200s Ha
Bin 2x2: 7x600s SII, 5x600s OIII
Equipment:
T: Takahashi FSQ106ED
C: QSI683ws Mono CCD, Astronomik Filters (6nm Ha)
M: Celestron Advanced Vx
G: QHY5-II
Acquisition and Processing:
PHD2, Sequence Generator Pro, CCDStack2, Photoshop CS6
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
SHO like palette processing
RGB version: flic.kr/p/2oKArcj
More acquisition details: astrob.in/8he66h/B/
The Crescent Nebula in Cygnus is produced by the Wolf-Rayet star WR 136 in its center. Wolf-Rayet stars live their life in the fast lane. They begin as massive O-type stars, which burn hydrogen to helium in their core so rapidly that they last only a few million years before ending as supernovas.
With an estimated age of around 4.7 million years, WR 136 is expected to die with a brilliat bang within a few hundred thousand years. Presently, WR 136 is shedding mass at a furious rate of roughly one solar mass per 10'000 years. This fast stellar wind is catching up to older material, ejected when WR 136 still was a red super giant and is shaping it into the Crescent Nebula shell, which is excited to glow by intensive UV radiation emitted by WR 136 in its center.
Located near the star Sadr (Gamma Cygni), the Crescent Nebula is surrounded by the rich star field and red hydrogen emission nebulae of this Milky Way region.
As a special treat, the Soap Bubble Nebula is faintly visible at the lower right corner of the frame. This faint planetary nebula was only discovered 2008 by an amateur astronomer. It is the result of another dying star. This sun-like star is running out of hydrogen fuel and thus shedding its outer layers. Contrary to much the bigger Wolf-Rayet stars, sun-like stars are not massive enough to produce a supernova explosion and will slowly cool as white dwarfs when running out of fuel for their nuclear fusion.
EXIF
Telescope: William Optics Megrez 88
Camera: ZWO ASI 1600MM Pro
Baader SHO and RGB filters
Mount: Equatoriallly mounted Skywatcher AZ-GTI
Rig Control: ZWO ASIAir Plus
30 x 30s RGB
30 x 180s SHO
Total exposure time 5h15min
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.
I’ve finally decided to take the plunge into Astrophotography, and I have to admit, it has been a steep learning curve. Even with all of the information available on the internet, there are a lot of things that cannot be taught. Experience is the best teacher. I can’t count the number of mistakes that I’ve made each night that I went out to collect data. On top of that, just like in “regular photography” you still have to learn the strengths and weakness of your equipment. Additionally, the one variable that we cannot control is the weather. There have been many of nights when the weather forecast predicted clear skies, only have unexpected clouds roll in and ruin a session. Lastly, time is a big problem. If you are like me, who lives in the city, without a backyard, you have to find the time to travel to a site where you can setup your Rig. For me this is nearly impossible during the busy work week, really only leaving the weekends to collect data. Having said that, it took me almost the entire summer to get this photo to where it is now.
To those of you who plan on getting into this hobby, have patience and don’t give up!
Clear skies and thanks for viewing!
About the Photo:
The Butterfly Nebula (IC1318) is a diffuse emission nebula found in the constellation of Cygnus, “The Swan”. In this photo, the Butterfly Nebula (left), the Crescent Nebula (bottom right; NGC 6888), and star Sadr (bright off centered star) which is located in the center or the heart of the constellation of Cygnus, can be prominently seen. The nebula (red) is about 4,900 light years away, while the star Sadr is much closer (approximately 1,800 light years).
This image was collected using a Duo-narrowband filter (Hydrogen Alpha (HA) and Oxygen III (OIII). Narrowband filters, in particularly HA, allow you to shoot in light polluted skies and during full moons.
Equipment and Settings:
Camera: ZWO ASI294MC Pro
Gain: Unity
Telescope: WO Redcat 51 f/4.9
Guide Scope: ZWO 30mm f/4 Mini
Guide Camera: ZWO ASI290MM Mini
Tracker: iOptron Skyguider Pro
Filter: STC DUO-Narrowband
HA_OIII Exposures: 70 X 240sec
Total Integration Time: 4.6 hours
*** All Rights are Reserved ***
Sadr region (IC1318) and the Crescent Nebula (NGC6888) to the east. Both are in the constellation Cygnus and are about 5000 light years from Earth. This image is an overlap of two other images, each comprised 50 3.5 min lights at ISO 800, 20 darks, 20 flats and 20 bias frames.
WO Z61, Flat 61, Nikon D7000 modified, L-eNhance, HEQ5 Pro unguided.
Sky-Watcher Quattro 150P f/3.5
QHYCCD Minicam8
Hubble Palette combined with HOO
30 x 60sec. subs each filter (1.5hrs. total)
Processed with Astro Pixel Processor, NoiseXTerminator and Affinity Photo
La constellation du Cygne à 35mm (équivalent à 50 mm en 24x36): 11 photos, 3 Darks, 9 Offsets ; 10 Flats. Assemblage dans IRIS et cosmétique dans Photoshop CS4. Nikon D5300 modifié astro par Eos for Astro, Nikkor AF-S 24-70mm F/2.8, télécommande Twin1 ISR2 + Monture Astrotrac 320x+ filtre IDAS LPS-D1-N
Paramètres: 11x 270s F/3.5 ISO 1250, 35mm.
Série prise le 23.8.2017
This is 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, aka the Black Arrow Cluster, is at left, while NGC 3293, the Gem Cluster, is at upper right. At far right is the ear-lobed shaped Southern 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. No filter was employed in shooting the frames. Autoguided with the SBIG SG-4 guider. Re-processed in 2024.
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 last week I photographed the Crescent Nebula (NGC 6888), a diffuse nebula in the Cygnus constellation. Why is it called that? Naturally, because we see it as crescent-shaped. It is located 4600 light-years away from us, with a diameter of 12.5 light-years. The bright star at its center, WR136, is a so-called Wolf-Rayet star, of which there are only about 1000 in the Milky Way. The star's mass is 15 times that of the Sun, it is barely a million years old, and in a few hundred thousand years, it will become a supernova. The material ejected from its surface forms the Crescent Nebula itself.
4315 x 10 sec, ZWO Seestar S50
SHO 96X300sec RGB stars Askar 130mm f7.7 Quad refractor ASI 1600. Ioptron, ZWO everything else Pixinsight RC Astro PS.
Dati: 64 x 300 sec a gain 5 e offset 25 @ -15° c + 117 dark + 30 flat e darkflat
Filtro: Astronomik UV/IR Block L2
Montatura: EQ6 pro
Ottica: Takahashi FSQ106
Sensore: QHY168C
Cam guida e tele: magzero mz5-m su Scopos 62/520
Software acquisizione: nina e phd2
Software sviluppo: AstroPixelProcessor e Photoshop
Temperatura esterna: 12 ° C - Umidità 37%
Added some Olll to this the other day, but nowhere near enough - not much time available this time of year. This is a crop of my previous image and is now 9 x 1200 secs Ha and 8 x 1200 secs Olll. The modded 450D doesn't quite get cold enough when it's really warm at night as it is at the moment (it's not a CCD after all, but it'll do for now) :)
ED80/HEQ5
Cooled mono Canon 450D
APT, PHD, EQMOD
Prepocessed and stacked in Nebulosity, processed in CS5
This is a direct comparison between Ha and OIII data in the Crescent nebula. I decided to do this as there's such a difference between the two. You can clearly see why the outer shell only ever shows up as blue when these images are combined..... there is no outer shell data in the Ha channel which is generally assigned to the red channel.
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. It was discovered by Friedrich Wilhelm 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.
Details
M: Mesu 200
T: Orion Optics ODK10
C: QSI683 with 3nm Ha and OIII filter
50x1800s Ha
51x1800s OIII
Totalling 50 hours 30m data.
The Crescent nebula NGC 6888 in narrowband.
10 x 25 min subs in HA
9 x 25 min subs in Olll
13 x 25 min subs in Sll.
Darks only. No flats or Bias.
Processed in Photoshop and Pixinsight
TEC 140
Avalon fast reverse mount.
Atik 490 cooled to -10
If you know the constellation Cygnus in the summer sky, you know it's also called the Swan, and a part of it is dubbed the Northern Cross. The center star in the "cross" is named Sadr. When you look up in the night sky at Sadr and the area around it, you just see a bunch of black space, and a few tiny stars. But as this image shows, there's a whole lot more up there than meets the (naked) eye!
This wide-field image was taken with a cooled astro camera and an inexpensive 135mm lens in my back yard. It's actually 131 shots of 90 seconds each - tracked and guided on an equatorial mount - that were combined to produce the final result. The amount of nebulosity - clouds of dust, hydrogen and other ionized gases - that the camera picks up in what to the naked eye is boring black emptiness is astonishing. That star near the center of the frame is Sadr. That distinctly jellyfish-like object to the upper right of Sadr is the Crescent Nebula (NGC 6888).
Maybe in my young son's lifetime someone will invent some goggles you put on that reveal all this celestial stuff that's out there that the naked eye cannot detect. That would be cool. Hey Google, you workin' on that?
Captured with an ASI2600MC Pro color camera paired with a Samyang 135mm f/2 camera lens. I used an Optolong L-Enhance dual bandpass filter. Stacking and calibration of the images were done in Astro Pixel Processor (APP). Processing was done using APP, Photoshop, and Topaz Denoise AI.
NGC 6888, an emission in the constellation of Cygnus, 5000 light years away. It is formed by the fast stellar wind from the Wolf-Rayet star HD 192163 colliding with and energizing the slower moving wind ejected by a star that became a red giant.
Tools:: ZWO ASI294MC Pro camera, Optolong L-eNhance filter, Astro-Tech AT80LE Telescope
Imaged from the red zone, Bortle 6
18 subs @ 300 seconds, 20 darks , 20 Flats
1hr 30 minutes total exposure
NGC 6888 - The Crescent nebula.
Captured from my garden across multiple nights and totalling just under 20 hours exposure time.
This image is made up of 6 separate panels to gain a wider field of view and more resolution.
Antlia 3nm Pro 36mm filter was used in a ZWO EFW. Camera was ZWO 533MM, 8" F4.74 newtonian telescope
Here's a selected set I've imaged/processed in 2017. Here's to a Happy New Year and clear skies for 2018! This has by far been the most productive year I’ve ever had. Total exposure on all these images was 133.4 hours.
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.
Crescent Nebula Widefield, one hour and 10 minutes of integration in SHO with Takahashi FSQ-106EDX4 106/382 f 3/6 telescope, QHY 600M Pro camera, are 14 shots of which in Ha 5x300 seconds, in OIII 4x300 seconds and in Sii 5x300 seconds, processing with Pixinsight and Photoshop. All data and shots were captured with Telescope Live. NGC 6888 (also known as the Crescent Nebula or C 27) is a diffuse nebula in the southern part of the constellation Cygnus. It is located 2.5 degrees southwest of the star γ Cygni, just west of a very rich star field, which includes objects such as M29 and IC 4996. The most intense part of the nebula is located in the western part, and forms an arc extended more in declination than in right ascension; this characteristic has caused the nebula to be called crescent, since it has the "hump" to the west, like the Moon in the waxing phase. To locate it you need a telescope, even if it has a small aperture; binoculars allow you to barely catch a glimpse of it in clear sky conditions. It is a typical stellar wind bubble generated by a massive Wolf-Rayet star (HD 192163), which is located inside it; This star would also be responsible for the nebula, which would constitute the material of the outermost layers of the ejected star. This wind collided with the material ejected from the star during the red giant stage, between 250,000 and 400,000 years ago, energizing it. The result is a gaseous shell and the presence of two shock waves, which then interacted with the dense surrounding interstellar medium.
In the past, it was also believed to have been a supernova remnant, whose progenitor star was part of the HD 192163 system. The nebula extends into space for a size of about 16 light-years.
NGC6888 The Crescent Nebula imaged in Ha and Oiii from London on 27th August 2017.
TS65Quad Astrograph, Atik314L+ CCD
45 mins Ha, 20mins Oiii captured and processed in Maxim DL and Photoshop CC. Ha mapped to red channel and Oiii mapped to green and blue
[Wikipedia]
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 Friedrich Wilhelm 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[3] to 400,000[citation needed] 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 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.
Skies have been cloudy around where I live, so I have reprocessed, and cropped to focus on the nebula. This is a new 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/2oKArcj
Ha, OIII with synth green, using Noel's 'Synthesize Green Channel fro Red & Blue' PS action
I did do SII as well but couldn't get my head around the colours, it looked most odd.
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.
This framing of the Milky Way in central Cygnus contains a rich assortment of types of nebulas:
- Throughout is the pinkish-red lacework of star-forming emission nebulas made of glowing hydrogen gas, most prominent at top around the star Sadr, in a complex called IC 1318, here partly cut off.
- At bottom right is the flower-shaped Tulip Nebula, aka Sh2-101.
- A small round nebula at centre left is Sh2-104.
- At centre is the magenta Crescent Nebula, aka NGC 6888. While this is also an emission nebula, it is a bubble blown out by a hot star called a Wolf-Rayet star near the end of its life.
- The pale arc below it is another example of a Wolf-Rayet nebula, known only as WR134.
- The field is also laced with lots of dusty dark nebulas, some very dark such as the distinct Barnard nebula called B145 at right of centre.
- Below it is a large region of yellower sky created by less opaque but still light-absorbing dust, a region with a distinct edge catalogued as LDN 862 (Lynds Dark Nebula).
So the area is a rich mix of dust and gas in the spiral arm of the Milky Way in which we live, with examples of star formation and star death.
The field of view is 7.6° by 5°.
This is a blend of filtered and unfiltered images: a stack of 14 x 8-minute exposures at ISO 3200 through an IDAS NBZ dual narrowband filter which recorded the nebulas best, blended with a stack of 15 x 6-minute exposures with a UV/IR cut filter only to record the normal range of visible wavelenghts for the naturally coloured stars and sky colours.
All with the Sharpstar 61mm EDPH III refractor at f/4.4, and with the filter-modified Canon EOS R camera, on the Astro-Physics 600E mount and autoguided with the Lacerta MGENIII autoguider. No darks taken; but each frame was dithered (shifted) slightly by a few pixels to help eliminate hot pixels when stacking and aligning.
All stacking, alignment and blending in Photoshop. Applications of the Nebula Filter and Dark Details actions in PhotoKemi actions, and of the Detail Extractor filter in Nik Collection Color EFX helped bring out the faint nebulosity, as did the use of luminosity masks created with Lumenzia. Taken from home on a very clear night September 9/10, 2023,
NGC 6888 captured during multiple nights between 2 and 13 July 2021, with two RC 8" on EQ6 mount and CEM70, two QHYCCD 183M camera and a CFW3 filter wheel equipped with Baader LRGB filters and Optolong LRGB-HA-Oiii fillter.
Multiple exposure time has been used to obtain the best of details, for a total exposure time of about 54 hours.
HAlpha 135x600" -20C bin 1x1
Oiii 120x600" -20C bin 1x1
RGB: 30x300" -20C bin 1x1 10s for each filter
NGC 6888 “Crescent Nebula” - shot on a ZWO ASI 2600 MC Duo camera , w/ TS Optics 90mm CF APO Refractor telescope. Optolong LXtreme filter. Guided with EQ6R Pro. 7 hours of total integration time .
This is ONLY 1 x 300 second H-Alpha image taken 20/7/17 in my backyard and processed in Pixinsight.
This is work in progress - colour image to follow once enough data taken.
Skywatcher 200P - 8" Telescope
ATIK 314L+ CCD
Orion Star Shoot Autoguider
EQ5 Mount
Baader 7nm Ha Filter
At the risk of boring you all rigid, I tried a different technique entirely on this version - used Straton (which I highly recommend) and JPM's tone mapping method to control those flippin' stars. Seems to have worked, and enabled me to do a wider field view as well. I'll put this to bed now.
A colorful area in the center of the constellation Cygnus, showing the Crescent Nebula and open cluster Messier 29. Long exposures reveal a rich starfield otherwise hidden by light pollution, and the filter preferentially passes the red light emitted by vast clouds of hydrogen space dust.
Tech Stuff: Borg 55FL/ZWO ASI 1600MC/IDAS LPS-V4 filter. 42 minutes of 4 second unguided exposures captured as SharpCap livestacks, processed with PixInsight, Topaz AI Denoise; and ACDSee Gemstone 12. From my yard in Westchester County, red zone Bortle 7 sky.
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