View allAll Photos Tagged rosettenebula
An interesting title you may think and you may wonder why I have written artistic impression........
Firstly let me say that the raw data for this 'experiment' is all mine and has been recently acquired. There is nothing new there. What I have then done is considered the processing and have coined a term 'Monochrome channel mapping'. What this means is that this image has been 'created' using ONLY Ha data, there is nothing more in there.
This is an experimentation processing technique that will horrify some and perhaps please others that this can be obtained by only having to acquire Ha data - In fact lets not be so prescriptive, the same could be done with any single filter data if the signal was sufficient.
So I hope that you enjoy this experiment and the debate that it may bring within yourself. I hope that I won't get burnt at the stake for heresy........
Details
M: Avalon Linear Fast reverse
T: Takahashi FSQ85 0.73x
C: QSI683 ws-g with Astrodon 3nm Ha filter
39x900s in Ha totalling 9h45m of exposure.
Nikon D810 with Optolong L Pro filter
Nikon f4 500mm manual focus @ f5.6
Light 238 x 30 sec @ ISO 2000
Dark 50
Flat 50
Bias 50
Unguided on equatorial mount
Two nights of acquisition - 160 minutes of total integration time.
Nikon D5300 Nikon 500mm catadioptric lens. 320 thirty-second light frames, plus dark. bias and flat calibration frames. Astro Pixel Processor, LR and PS.
OBJECT: NGC 2244, Rosette Nebula, Monoceros constellation, RA (center) 6h 34 min, DEC 05°, apparent magnitude 9,0, apparent dimensions 1,3°, FOV approx 4,1°x 2,7°.
GEAR: Nikon Z7 Kolari Full Spectrum + Nikkor 500 PF, 5,6, Astronomic UV/IR/L2 Clip in filter, Rollei Astroklar light pollution filter, Dew heater strip, tracking mount iOptron CEM60EC
ACQUISITION: March 22, 2022, Struz, CZ, Subexposure 180s, f 5,6, ISO 1600, Interval 15 s, RAW-L, Lights 18x, Darks 20x, Bias 20x, Flats 20x, DarkFlats 15x. Total exposure time 54 min. Night, clear skies, breeze, +3° C, no Moon, Backyard - Light pollution - Bortle 5.
STACKING AND POST PROCESSING: AstroPixelProcessor (stacking, background neutralisation, light pollution removal, calibrate background and stars colours), Adobe Photoshop CC 2022 (stretching, black and white point settings, star reduction, enhance DSO, deep space noise reduction, contrast setting and sharpening). No cropped, image size 3840 x 2560 px.
Learning Pixinsight a couple of weeks now, and here is my first Result.
A complete HOO Processing of Rosette Nebula.
Nikon D5300 Nikon 500mm catadioptric lens. 160 thirty-second light frames, plus dark, bias, and flat calibration frames. APP, LR, and PS. Viewing conditions were more difficult than predicted - 68 degree dew point and intermittent clouds.
My first post for a long time, the reason being I've been learning astrophotography and setting up my new gear to take images of the cosmos.
This is the Rosette Cluster and Nebula, NGC2239/NGC2244/C50 and NGC2237/C49 in the Monoceros region of the Milky Way.
The capture details are:
iOptron CEM70 mount
Canon 7D Mark II (ISO1600) + Canon EF 600mm f4 L IS II (f4)
Optolong L-Pro filter
Primaluce 60mm guidescope + ZWO ASI290MC
Capture software: APT + PHD2
1 hour 12 mins total integration (5 min guided subs)
Stacked in DSS (15 lights, 12 darks, 64 flats/64 dark flats)
Processed in Photoshop + Topaz Denoise
The Rosette Nebula centred on cluster NGC2244
A bi-colour image consisting of 3 hours Ha and 3 hours Oiii shot fro London over two nights (20th and 24th January 2017)
TS65 Quad Astrograph & Atik 314L+ CCD camera
The Rosette Nebula (also known as Caldwell 49) is a large spherical H II region (circular in appearance) located near one end of a giant molecular cloud in the Monoceros region of the Milky Way Galaxy. The open cluster NGC 2244 (Caldwell 50) is closely associated with the nebulosity, the stars of the cluster having formed from the nebula's matter.
The cluster and nebula lie at a distance of some 5,000 light-years from Earth and measure roughly 130 light years in diameter.
The radiation from the young stars excites the atoms in the nebula, causing them to emit radiation themselves producing the emission nebula we see. The mass of the nebula is estimated to be around 10,000 solar masses.
Equipment:
Astro-Tech AT80EDT f/6 ED Triple Refractor Telescope
Sky-Watcher EQ6-R Pro Computerized GoTo Telescope Mount
Orion 50mm Helical Guide Scope & StarShoot AutoGuider
Orion 38mm clear-aperture Field Flattener
PHD2 Guiding Software
Astronomy Tool Actions
Thank you for your comments,
Gemma
The Rosette Nebula imaged from London on the nights of 19th January 2022 (Ha) and 27th January 2022 (Oiii). Presented in Ha (red) and Oiii (blue & green) representing ~4 hours of 90 second subs for each channel.
TS65 Quad Astrograph & ZWO ASI1600MM Pro camera.
For this image I used the same narrowband data as for my recently posted Rosette nebula image in the Hubble palette.
The beauty of narrowbanding is that you are free to combine the data to your liking. Here I tried to show the nebula closer to its 'true' red color, while emphasizing blue OIII data. For this, I used the following mix:
Red channel: 50% Sll + 50% Ha
Green channel: 20% Ha + 80% Olll
Blue channel: Olll
As there is no preferred direction in space, there also is no correct orientation for deep sky astro images. I therefore rotated the image 180° to show why the Rosette nebula is inoffically called Skull nebula.
Can you see the skull?
Prints available: ralf-rohner.pixels.com
EXIF
William Optics Megrez 88 f/5.5
ZWO ASI 1600MM Pro
20 x 180s with Baader 4,5 nm Sll, Ha, Olll filters
Imagen tomada la noche del sábado 16 de diciembre.
1:35h exp. 19x300s a iso 1.600
Canon eos 600D modificada y refrigerada
Skywatcher 150/750 pds
guiado con zwo asi 290mc y newton 130/650
Montura skywatcher Neq6 pro2
Rosette Nebula imaged from London on the 23rd & 24th February 2016. 1 hour Ha, 1 hour Oiii. Imaged processed in Photoshop CS6 using the Steve Cannistra Bi-colour technique
TS65 Quad Astrograph, Atik314L+ CCD. Stacked in DSS
Another attempt at the Rosette Nebula in Monoceros using the L-Enhance filter. Looks much better and I'm very happy with this!
The Rosette Nebula (NGC 2244) is a large emmission nebula located in the constellation Monocaros. At a distance of 5.2k light years, this H II region occupies more the 1.3 degrees of sky - which is more than 2.6 times the diameter of the full moon. At its center, young hot O-type stars are evaporating its dust, creating a central void. These stars were formed in the gas and dust which comprise the nebula.
20180208 - Newtown, PA
Nikon D5500
Nikon 300mm f/4.5 MF ED, @f/5.6, 3200iso
90x30s (Stacked in Regim w/Darks & Flats)
iOptron SkyTrackerPro
Regim Sigma1.8 (darks & flats)
Processed in Affinity Photo
RG_RosNeb_Sig18f_APtm5030AP2_50r90q
Fanciful names given to two of the dark nebulae/Bok globules around the edge of the central cavity in the Rosette nebula.
Stars removed with StarNet tool in PixInsight.
Detail from previous image:
www.flickr.com/photos/16271433@N02/52677186304/in/photost...
The Rosette Nebula imaged from London in Hydrogen Alpha. 4 1/2 hours of 90 second subs. TS65 Quad Astrograph & ZWO ASI1600MM Pro camera.
The Rosette Nebula is a Hydrogen II region located near one end of a giant molecular cloud in the Monoceros region of the Milky Way Galaxy. The nebula is at a distance of 5,000 light-years from Earth and measures roughly 130 light years in diameter.
Taken from my backyard in Gérgal, Almería, Spain over multiple nights. The narrow band imaging started in November and December 2021 and final RGB images in January 2022. Total usable imaging time 20 hours. The image is a classic Hubble colour palette with RGB stars added.
Equipment details can be found at astrob.in/j9lej9/0/
Tech Specs: Rosette Nebula wide field
Fujifilm X-T3, Fujifilm 16-55mm f/2.8 @ 55mm & f/4.5, cropped
Orion Sirius EQ Mount, Bortle 4 skies, Oracle, Arizona
25x60s, iso 1600, Post-process in PixInsight
Picture of the Day
Finally I managed to capture the Rosette Nebula with a decent amount of light and structure. This is a DSO target I will definitely visit again.
TS72, 432 mm, HEQ5 Pro guided
CANON 550Da, ISO 800
3,1h integration time (siril, lightroom)
The Rosette Nebula in Monoceros is an active stellar nursery from which the stars in cluster at its center, NGC 2244, were born. This image was a bit of an experiment and was taken using a 300mm f/4 lens (rather than a telescope) stopped down to about f/5 using filter reducing rings instead of the internal aperture blades to improve sharpness while avoiding diffraction spikes.
Camera: Full-spectrum modified Nikon D5300
Lens: Nikon 300mm f/4 (externally stopped down to ~f/5)
Mount: iOptron iEQ45 Pro
Integration: 70 minutes (14 x 5 mins)
Post-Processing Software: PixInsight 1.8.8, Corel Paintshop Pro
Captured under dark skies near Goldendale, WA
This is an image of the beautiful Rosette Nebula in the constellation of Monoceros. The image is captured in the H-alpha emission wavelength (approx. 656nm).
The nebula gets its name form its resemblance to the assembly of petals in a rose. Lying some 5,200 light-years from us the nebula is a large, circular emission nebula. The whole structure is energized by the ionisation of hydrogen gas by the hot young stars at its centre. Those hot young stars make up open cluster NGC 2244 and can be seen in the centre of the nebula.
Within the nebula dense pillars of gas and dust are visible. These structures are potential sites for ongoing star formation.
Intense radiation and solar winds have shaped the nebula into intricate shells and layers which can be seen in the image.
Imaged with an Askar 71 petzval refractor and a ZWO 1600mm camera fitted with a Baader Ha filter. A total of 3.5hrs of exposure calibrated with temperature matched dark frames.
Unfortunately encroaching clouds cut short my imaging session...
Thanks for looking!
The Rosette Nebula taken using a William Optics Z61ii and Canon EOS 6D. About 3 hours of 45 second lights, 45 darks, 50 bias. Edited in PS and LR.
The name of this chapel is 'St. Joseph on the Mountain' and the image is, therefore, a perfect fit for yesterday's Saint Joseph's Day.
EXIF
Canon EOS Ra
Tamron 15-30mm f/2.8
IDAS NBZ filter
iOptron SkyTracker Pro
Foreground:
Single exposure 60s @ ISO800
Sky:
2 panel vertical panorama, each a stack of 10 x 60s @ ISO800 & 5 x 120s @ ISO3200
Tech Specs:
Taken 21-22 Dec 22, Oracle, Arizona, Bortle 4,
Transparency 9/10, calm, temperature 38F, RH 78%
Nikon d7100, Nikkor 180mm f/2.8 @ f/5
212x90s, iso 3200, Raw
Orion Sirius EQ mount, PixInsight
A closer look at the Open Cluster NGC 2244 at the heart of the Rosette Nebula in the constellation Monoceros. It contains about 20 stars brighter than magnitude 10 and about a dozen fainter ones. It lies about 5000 light years away.
The Rosette Nebula imaged from London on the nights of 19th January 2022 (Ha) and 27th January 2022 (Oiii). Presented in Ha (red) and Oiii (blue & green) representing ~4 hours of 90 second subs for each channel. Stars have been removed to better show the structure of the nebula.
TS65 Quad Astrograph & ZWO ASI1600MM Pro camera.
NGC2244 (aka Caldwell 50) is the open cluster at the center of The Rosette Nebula located in the constellation of Monoceros (The Unicorn). It is approximately 5,200 light years distant from Earth with a magnitude of 4.8. The stars within this cluster and the Rosette nebula are related and it is believed they formed within the nebula. This cluster contains several giant stars of type O4V, a rare class of super-hot bright blue stars in their main sequence. The two brightest stars within the cluster are 400K and 450K times more luminous than our Sun and about 50 to 60 times its mass. These stars solar wind and radiation are responsible for the center hole of the Rosette nebula. NGC2244 is easily visible with binoculars and spectacular even with small telescopes; however, the nebula is only visible in CCD or DSLR images.
Taken at Kirland, IL (Potawatomi Forest Preserve) on 20150314 at 2200
Image Type: LRGB
L 7 x 600 1x1
RGB 9 x 300 2x2
Hardware:
AstroTech RC 8” with field flattener
Orion 400m Short Tube piggy back for guiding
Orion Star-Shooter Auto-guider
QHY9M with filter wheel
Software:
EQMOD with Starry Night Pro 7
Nebulosity 3.0.2
CCD Stack
Photoshop
Tried something new with a test image taken March 15, 2023. An hour of 3 minute sub-images taken from a metro location with an Optolong L-eNhance filter were stacked, then Starnet++ to isolate the nebula, Absolute Point of Focus (APF) method of sharpening the nebula, then the stars were blended back in.
www.baader-planetarium.com/en/blog/apf-r-absolute-point-o...
rosette-20x180-qhy294c_-10c-ug-o60-lenh-85f5_6-apf
I am pretty excited with my first narrowband image. Narrowbanding allows me to do DSO imaging from my light polluted suburban Bortle 6 backyard and even if the moon is in the sky.
Filters with a tiny bandpass of only 4,5 nm around the wavelengths of singly ionized sulfur (Sll), ionized hydrogen (H-alpha) and doubly ionized oxigen (Olll) are used with a monochrome astro camera to capture 3 different images that can be combined into a color image.
There is a catch though: SII and H-alpha are in the red spectrum, while Olll is teal. This makes it hard to produce an image with colors like the human eye would see.
The most common solution is to not even try to. That's what NASA did with the famous "Pillars of Creation" image from the Hubble Space Telescope. They assigned Sll to the red, H-alpha to the green and Olll to the blue channel. This is called the Hubble palette, a false color image that shows the distribution of the different gases.
My image shows the normally red Rosette nebula in the Hubble palette.
Here some additional facts from Wikipedia: The Rosette Nebula is a large spherical HII region located near one end of a giant molecular cloud in the Monoceros region of the Milky Way Galaxy. The open cluster NGC 2244 is closely associated with the nebulosity, the stars of the cluster having been formed from the nebula's matter. The cluster and nebula lie at a distance of some 5,000 light-years and measure roughly 130 light years in diameter. The radiation from the young stars excites the atoms in the nebula, causing them to emit radiation themselves producing the emission nebula we see. The mass of the nebula is estimated to be around 10,000 solar masses.
EXIF
William Optics Megrez 88 f/5.5, piggy backed on a wedge mounted Celestron NexStar 8GPS
ZWO ASI 1600MM Pro
20 x 180s with Baader 4,5 nm Sll, Ha, Olll filters
Manage to image this in one night, out of 3 clear nights I had recently (Who said Christmas comes but once a year). This is a wider field image than my previous ones at about 2°. Taken with the Explore Scientific 102mm F7 and Explore Scientific 0.7 focal reducer. After sleeping on it over night I felt that my processed image was over saturated so I dialled it back a bit. Always worth looking at your image with a fresh pair of eyes in the morning before posting.
Note:
I removed all the stars after the initial processing using StarNet++ and then added the combined Ha Oiii stars back in at the end.
The Rosette Nebula commonly known as NGC 2237 with its associated Open Cluster NGC 2244. This is a large Ha region which is part of a large molecular cloud in the of constellation Monoceros. It lies at a distance of approximately 5,200 ly from earth and is about 130 ly in diameter. The age of the open cluster is estimated to be less than 5 million years.
EQUIPMENT:-
Telescope: Explore Scientific 102mm F7 APO Carbon
Focal Reducer: Explore Scientific 0.7
Mount: AZ-EQ6 GT
Imaging Camera: ZWO ASI1600mm-Cool cmos
Guide Camera: Orion Mini Auto Guide
Filter: Astronomik 6nm Ha
Filter: Astronomik 6nm Oiii
IMAGING DETAILS:-
NGC2244, NGC2237 Rosette Nebula (Monoceros)
Gain 139 (Unit Gain)
Dithering
Chip Temp Cooled to -20 degC
25 Ha subs@300sec (2h 05min)
28 Oiii subs@300sec (2h 20min)
Total imaging Time 4h 25min
20 Darks
25 Flats
PROCESSING/GUIDING SOFTWARE:-
APT "Astro Photograph Tools"
StarNet++
DSS
PS CS2
This is the the Rosette Nebula. It’s more of that gas and dust floating everywhere in our galaxy but when a bright group of stars like this cluster in the centre throws off its intense energy, they light up the gases. When looking in a telescope or photographing it, we can see its ‘landscape’ sculpted by the stellar winds and radiation. The stars are blowing a hole in the gas at the centre and we can see through it! The colours come from mostly hydrogen gas that glows pink and red but also blue. I used special filters to capture these real colours. Captured with my Ceravolo 300mm astrograph at f/4.9 with an SBIG STX 16803 CCD camera. there are 14 hours of total exposure time in this image.
The Rosette Nebula is a large, circular H II region located near one end of a giant molecular cloud in the Monoceros region of the Milky Way Galaxy. The open cluster NGC 2244 is closely associated with the nebulosity, the stars of the cluster having been formed from the nebula's matter. The cluster and nebula lie at a distance of some 5,200 light-years from Earth and measure roughly 130 light years in diameter. The radiation from the young stars excites the atoms in the nebula, causing them to emit radiation themselves producing the emission nebula we see. (Wikipedia)
Image was shortlisted for Insight Astrophotographer of the Year 2016 competition at the Royal Greenwich Observatory in the Stars and Nebula category.
First try of new focal externder (x1.6). Used to enhance luminance data for central region.
Bi-colour narrowband image: 7/1/16 & 3/2/16
Oxfordshire, UK
4 Hours Total Combined Exposure
5x1800s Ha@f/5, 4x1200s Ha@f/8, 1x600s bin2x2 SII@f/5
Equipment:
T: Takahashi FSQ106ED @ f/5, extender-q 1.6x (f/5->f/8)
C: QSI683ws Mono CCD, Astronomik Filters (6nm Ha)
M: Celestron Advanced Vx
G: QHY5-II
Acquisition and Processing:
PHD2, Sequence Generator Pro, CCDStack, Photoshop CS6
This is the Rosette Nebula (C49) taken on Jan 12, 2023. The nearby stars are responsible for the nebula’s glow. Their radiation ionizes the surrounding clouds of gases, causing them to emit their own light. The nebula glows in the red part of the spectrum because the powerful ultraviolet radiation from the stars strips electrons from the nebula’s hydrogen atoms.
Tracker AM5
Camera ASI294MC Pro @ gain 121
Lens Sigma 150-600 @500mm
70 - 180second exposures for 3.5 hours integration
30 - Dark, Flat, Dark Flat calibration files
Stacked in DSS
Background extraction, color calibration in SiriL
Curves, Levels, sharpening in Photoshop and Camera Raw
Another re-processing of old data, this time it's the Rosette Nebula taken back in January 2020. I've streamlined and simplified me processing methods with the help of StarNet ++ leading to better processed images ( I hope) This object would benefit from a focal reducer which I hope to have at some point in the new future.
This was imaged over 2 nights, the Ha on the 21st and Oiii on the 28th January 2020. I was hoping for an early night after getting the Oiii but this didn’t happen as this was the night I tripped up while packing up and biting through my lip. This required driving myself down to A&E and getting 3 stitches. I end up getting home at 4:30am. Considering I hit my head on the water feature, the result could’ve been far worse. A dangerous hobby this astronomy.
The Rosette Nebula commonly known as NGC 2237 with its associated Open Cluster NGC 2244. This is a large H II region which is part of a large molecular cloud in the of constellation Monoceros. It lies at a distance of approximately 5,200 ly from earth and is about 130 ly in diameter. The age of the open cluster is estimated to be less than 5 million years.
EQUIPMENT:-
Telescope Meade 6000 115mm and AZ-EQ6 GT
ZWO ASI1600mm-Cool cmos camera
Orion Mini Auto Guide
Astronomik 12nm Ha Filter
Astronomik 6nm Oiii Filter
Chip Temp Cooled to -20 degC
IMAGING DETAILS:-
NGC2244, NGC2237 Rosette Nebula (Monoceros)
Gain 139 (Unit Gain)
Dithering
30 Ha subs@360sec (3h 00min)
25 Oiii subs@360sec (2h 30min)
Total imaging Time 5h 30min
20 Darks
25 Flats
PROCESSING/GUIDING SOFTWARE:-
APT "Astro Photograph Tools"
DSS
PS CS2
The Rosette Nebula, 58 hrs of exposure time from Phoenix. Amazing details in this beautiful nebula that is 5 x the size of the moon in the night sky and is 5,000 light-years away. It would take 130 years traveling at the speed of light (286,000 miles per second) to go from one side to the other.
Esprit 120mm, QHY268M, Optolong 3nm SHO filters. 10min exposures, mounted on a SkyWatcher EQ6-Rpro
It's been some time since I have done astrophotography but the recent cold and crisp weather has provided a perfect opportunity to get out and image again and re whet my appetite. This image of the Rosette Nebula (also known as Caldwell 49) was taken from the garden in Salisbury over two successive nights. The nebula is a H II region located near one end of a giant molecular cloud in the Monoceros region of the Milky Way galaxy. The open star cluster NGC 2244 (Caldwell 50) at its centre is closely associated with the nebulosity, the stars of the cluster having been formed from the nebula's matter. The cluster and nebula lie at a distance of 5000 light-years from Earth and measure roughly 130 light years in diameter (to put this in context, light from the sun takes just 0.000015561 light years, or 8 minutes, to reach Earth!) The radiation from the young stars excites the atoms in the nebula, causing them to emit radiation themselves producing the emission nebula we see. The mass of the nebula is estimated to be around 10000 solar masses.
This image comprises 198 x 3 minute images stacked and processed to generate a final image.
William Optics GT81
William Optics Flat 6AIII
ZWO ASI2600MC Pro
ZWO ASI Air Pro
Skywatcher HEQ 5 Pro
Optolong L-eXtreme filter
ZWO EAF
198 x 180s lights, 40 darks, 50 flats, 50 dark flats at gain 100 and cooled to -10C.
Stacked in DSS and processed in PS and LR
Explore 22 January 2023
The old hospice at the Simplon Pass, also known as the Alter Spittel, was built by Kaspar Stockalper around 1650.
Stockalper was a businessman who shaped the Simplon Pass and the entire region. Among other things, he had trade relations with Italy and France, and he set up the courier service with horse mail over the Simplon Pass between Milan and Geneva in 1640.
The old hospice is a five-storey building made of solid granite. It served as a shelter for travelers, goods, and pack animals. At that time, a mule track led over the Simplon Pass. Some of it is still accessible today. The path is known today as the Stockalperweg.
Prints available: ralf-rohner.pixels.com
EXIF
Canon EOS Ra
Sigma 28mm f/1.4 @ f/2
IDAS NBZ filter
iOptron SkyTracker Pro
Sky:
Panorama of 2 panels, each a stack of 10 x 60s @ ISO800 unfiltered + 5 x 120s @ ISO3200 with the NBZ filter
Foreground:
Single exposure of 30s @ ISO800
Okay, this may be a bit out there, but this is the start of a new project I've been working on this fall / winter. I really love deep space objects, and while images of only the night sky can be super cool, to me, they're missing context. In any case, I thought it would be cool to showcase some of these neat objects in relation to earth objects.
What you're looking at is the Rosette Nebula, rising from behind a mountain here in East Tennessee. Everything is shot at 300mm and is 100% astronomically accurate. Because night sky images like this require the gathering of lots of data, it wasn't possible for me to shoot this all in one night (though the foreground and a lot of the sky data were gathered in one go from one tripod position). Anyway, expect more of these as the winter progresses!
The Rosette Nebula is a cloud of dust containing enough gas and dust to make about 10,000 stars like our Sun. In the centre of the nebula is a cluster of hot, bright young stars. These are warming up the surrounding gas and dust, making it appear bluer. The small, bright white regions are cocoons of dust in which huge stars are currently being born. These “protostars”, each one of which will probably become a star up to ten times more massive than the Sun, are heating up the surrounding gas and dust and making it clow brighter. The smaller, redder dots on the left side and near the centre of the image also contain protostars, but these are smaller, and will go on to form stars much like our Sun. Just as the centre of the nebula contains bright young stars, in a few tens or hundreds of millions of years these stars will have died, but the protostars will have evolved into fully-fledged stars in their own right. In this way, the star formation will move outwards through the nebula.
A reprocess of www.flickr.com/photos/124244349@N07/51786194929/in/datepo...
The Rosette Nebula is a fairly large structure to the east of Orion's shoulder. The significant H-alpha content makes it a fine target for imaging from light polluted locales like the New York City suburbs.
I have not been very meticulous with this reprocess as I'm just getting my bearings with some new features of PixInsight before teaching Urban Astrophotography starting next week for New York City's Amateur Astronomers' Association.
aaa.org/event/urban-astrophotography-deep-sky-imaging-202...
Tech Stuff: Borg 71FL/Borg 1.08X Flattener/ZWO ASI 1600MC Color cam/IDAS LPS V4 nebula filter/iOptron CubePro mount, unguided. 2.5 hours of 8 second exposures captured in SharpCap livestacks, processed in Pixinsight and finished with ACDSee GemStone 12. From my yard in Westchester SQM-L 18.8 (red zone Bortle 7).
I've always avoided doing DSOs in Moonlight but a while back, I bought an Optolong L-eNhance Triband filter which can be helpful in reducing light pollution and stray Moonlight - it predominantly passes 3 narrow band widths centred on:
Hydrogen Alpha: Red, 656.4 nm
Oxygen III: Green, 500.7nm
Hydrogen Beta: Green-Blue, 486 nm
The filter is certainly more opaque than my standard IDAS P3 light pollution suppression filter. Usually my flats are exposed at 1600ms but for this filter it was 6500ms at 0 gain. Autofocus and plate solving exposures were 4s at 578 gain.
The raw image was lacking in contrast - not surprising given the Moonlight but I've used curves enhancement and local contrast enhancement in PixInsight to improve that. I haven't altered the colour palette as this was a first test for this filter.
Technical Card
480/80mm f/6 Altair Starwave triplet refractor.
Altair Planostar 1.0 x FF with 2 inch L-eNhance filter
ZWO ASI2600MC; 39 x 360 second subs, Gain 100, Offset 25, Temp = -15c.
EQ6 pro mount with Rowan belt drives. EQMOD control. Primalucelab Sesto Senso electronic focuser.
Session control; SharpCap 4.0 on laptop with WiFi link to IPad.
Automated plate solving GOTO.
Automated FWHM multistar focusing every 16 frames. +/- 500 steps at 2s and 578 gain.
20 dark frames
50 flat frames (electroluminescent panel, 6500ms exposure @ 0 gain).
Post processed in PixInsight 1.8.9.
Light Pollution and Weather:
SQM (L) not recorded - 95% Moon
Session ended by cloud, target was also very near roof level.
Polar Alignment:
Resumed from previous Park.
Error measured by PHD2= 0 arc minute.
RA drift + 2.44 arcsec/min
Dec drift - 0 arcsec/min
Guiding:
PHD2 guiding with ZWO ASI290mm/Altair Starwave 206/50mm guider. Every 4th sub dithered.
RA RMS error 1.1 arcsec
Dec RMS error 0.82 arcsec
Astrometry:
Resolution: 1.612 arcsec/px
Rotation: -87.819 deg
Observation start time: 2023-02-07 20:41:29 UTC
Observation end time: 2023-02-08 01:09:49 UTC
Focal distance: 481.13 mm
Pixel size: 3.76 um
Field of view: 2d 9' 37.7" x 1d 41' 33.2"
Image centre: RA: 6 32 17.164 Dec: +4 58 40.33
Rosette nebula on visible and infrared spectrum. Stacking of several exposures of 30'' with iOptron + darks and bias. Stacking with DSS. Canon 550D IR mod, Tamron 600 mm f/6.3, iso 6.4k. Taken on Nov. 2019 from Sounion, S. Attica, Greece.
Photography and Licensing: doudoulakis.blogspot.com/
My books concerning natural phenomena / Τα βιβλία μου σχετικά με τα φυσικά φαινόμενα: www.facebook.com/TaFisikaFainomena/