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Goofi's Imaging Challenge, April 2020 - NGC 2903

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#1 nmoushon


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Posted 02 April 2020 - 10:43 AM

The April 2020 Challenge is now open. The target is NGC 2903 a barred spiral galaxy in Leo. To reduce the number of stickies, please submit your entry to this thread.


For those having troubles locating the target here is a post that will help locate near by objects.


The Rules will remain pretty simple:


      Your Equipment

      Your Data, Captured This Season

      Your Processing

      One Entry Per Member

      Only post your FINAL image


To increase participation over such a diverse group, the winner will be selected by random drawing. Please feel free to start a thread requesting guidance on your entry prior to submitting it, the whole purpose of this challenge is to learn and compare on a common target. Entries must be submitted by midnight eastern time on April 30, and I will try to announce the winner sometime on May 1.


Note: If I am late announcing, gently nudge one of the moderators in a private note, it helps. Seriously, PM one of us!


Please display an image in your post, not just a link!!


I hope everyone has fun with this one, and with that,


Let The Games Begin


**Disclaimer** - If the selected winner does not reply and pick a target with-in 3 days of the winner being announced, the Mods will then select the next target.


#2 Gipht



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Posted 02 April 2020 - 03:07 PM

I had imaged NGC 2903 on March 3 of this year.  The moon(73% illuminated) was at an 80 degree angle, so some moonlight was coming into the reflector opening, which was  likely to cause a reflection.  A piece of cardboard and a bungie fixed that problem.  This is about 2.5 hrs of RGB at binx2 with the ASI183 camera and a 8 inch f/4 reflector.  The mount used was a CEM60 guided.  Stacked in DSS and developed in Star Tools and Gimp.



Attached Thumbnails

  • ngc29032020.jpg


#3 BABOafrica


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Posted 09 April 2020 - 08:57 AM

NGC 2903


Meade 102mm APO (using an Astronomik UHC) with the moon at ~90% luminosity

Red Zone

AVX guided with Orion SSAG & PHD2  (good guiding: used 95% of my light frames)

Fuji X-A2 (iso 6400)

Processed with DSS (darks/bias/flats) & StarTools


20 x 180s


NGC2903 8APR20 20x180s F2-64-U M102 sec ST.jpg



I did it last night under some moderately clear skies, which, unfortunately, clouded up after an hour.






#4 JacobB5


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Posted 11 April 2020 - 01:43 AM

After a month of cloudy skies, March was a wash, it was nice to get out again again. 


Orion 8" f/4
Canon T3i (stock)
34 * 180

10 * 120

20 * 60
30 * 30


Curves, Levels, Crop in Gimp.

Attached Thumbnails

  • NGC2903b.jpeg

Edited by JacobB5, 11 April 2020 - 01:43 AM.


#5 GoBlue


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Posted 11 April 2020 - 09:03 PM

Would be a nice little target...if it wasn't next to a pink moon.


Explore Scientific ES ed80 f/6 480mm fl.

Full modified T3i w/ IDAS LPS D1.

Orion guide package



33 x 120.

ISO 800.

Camera sensor temp +9c.


Heavily cropped. No love for the 80's lately.


BYEOS, PHD2, DSS and the never reliable PS.




Attached Thumbnails

  • ngc 2903.jpg


#6 colinrm


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Posted 14 April 2020 - 03:55 PM

Here's my attempt and first submission for one of these.




SkyWatcher Quattro 300 and coma corrector

SkyWatcher EQ8-R Pro

Modded Nikon D5300


Processed with Siril and GIMP.  Not quite four hours in bad light pollution.

Edited by colinrm, 14 April 2020 - 03:58 PM.


#7 Jellmeister


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Posted 15 April 2020 - 05:49 AM

Here is my shot taken and processed 22 March 2020 (less than a year after my first successful stacking attempt).


Made from 102 subs 15 seconds each at 4000 ISO through my Nexstar Evolution 8 (Celestron 8” SCT with 0.6x Corrector reducer). My camera is a Sony A7iii. The mount is Alt/Azimuth with no wedge so the subs are short to avoid field rotation. Also, I have no guiding beyond the goto, so tracking accuracy is also problematic if I go longer.

Stacked on DSS and lightly processed on Capture One, then more on iPhone.

Uploaded version slightly nobbled to get under 500kb limit.

Attached Thumbnails

  • A40BCE72-BA0B-499D-A7FA-868A1F85AF54.jpeg

Edited by Jellmeister, 15 April 2020 - 05:49 AM.


#8 Wintermute


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Posted 15 April 2020 - 05:10 PM

Bigger: https://i.imgur.com/XyiUNoA.jpg

Just a little smaller than our own Milky Way, NGC 2903 is a barred spiral Galaxy 20 million light-years distant in the constellation Leo.

49x300" Skywatcher Evostar 150mm APO, ZWO asi071mc-pro, Baader Moon & Skyglow Filter
166x90" Celestron 8" RASA, asi183mc-pro, Celestron LP Filter asi290mc in a Skywatcher
Evoguide 50 guiding a Skywatcher EQ8-R Pro mount.

Processing: AutomaticBackgroundExtraction, HistogramTransformation, UnSharpMask, LocalHistogramEqualization, ACDNR for noise, CurvesTransformation for brightness and contrast, MorphologicalTransformation on a Starmask, combined via Pixelmath.


#9 Johnlp


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Posted 17 April 2020 - 10:33 AM

New equipment 2nd target 1st post on CN and heres my attempt at NGC2903

Camera ZWOASI1600MMPro temp -5 deg C
Scope  iOptron RC6 no flattener or reducer
Mount iOptron CEM 25EC
Filters ZWO LRGB 1.25”
Astronomik Ha 6nm 1.25”
Exposures collected in NINA 9, 10, 11 April 2020.
Clear 98 x 60sec 1x1 gain 129
Red 75 x 120sec 1x1 gain 129
Green 77 x 120sec 1x1 gain 129
Blue 48 x 120sec 1x1 gain 129
Ha 10 x 600sec 1x1 gain 129

Stacked in DSS 4.2.3
Processed in Startools 1.6.386 using Combine module Red with Ha then
Luminance, Color               Luminance Red                 Green               Blue
L + Synthetic L From RGB, RGB Lum.fits             New Red Ha.tiff Green.fits Blue.fits

Binned 50% in ST.



Attached Thumbnails

  • NGC2903 LLR(ha)GB.jpg


#10 groundball_with_eyes


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Posted 18 April 2020 - 12:14 PM

Here's my first go at this forum.  This is a preliminary image generated from data collected Thursday, April 16 from my backyard in the badly light-polluted Vancouver area.  Not a big fan of the colours and will fiddle with it over the next while.  I've got another 200 light frames to attempt to apply, however, the mount wasn't tracking too well when I took them. 


The particulars are as follows:

  - Celestron 1100HD CPC Deluxe w/ Starizona Hyperstar, unguided
  - ZWO ASI294MC Pro cooled to -15 deg C
  - 195 light frames, 10 sec each
  - 50 darks, 50 bias frames, 50 twilight flats
  - processed using DeepSky Stacker, StarTools, and GIMP




#11 johnsoda


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Posted 19 April 2020 - 09:35 AM

Click on small image for acquisition details.




NGC 2903.jpg


#12 ImNewHere



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Posted 20 April 2020 - 08:37 PM

I know it is pretty bad, but I was working off of a malfunctioning mount last night.

NGC2903 from my front yard, 30x 60s, ISO 1600, 40 darks (that weren't matched lol), 60 bias, 20 flats. Stacked in DSS, processed in Photoshop CS6 about 10 minutes or so since Photoshop 2020 keeps crashing on me. I wasn't going to take it, but I did it for the challenge. Clouds rolled in on the "clear" night before I could get more or I'd have left it on there for a good 3 hours.



Attached Thumbnails

  • NGC2903sm.jpg


#13 fmeschia


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Posted 23 April 2020 - 12:08 AM

Here’s mine:




Astro-Tech AT130EDT with Astro-Tech 0.8x flattener/reducer

Nikon D5500, H-alpha modified by Lifepixel

IDAS LPS-D1 filter

iOptron iEQ45 Pro

Lacerta M-GEN standalone autoguider

Lacerta M-FOC standalone autofocuser

10 hours of total integration

Bortle 7 sky


More details on the Astrobin page:





#14 rekokich



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Posted 23 April 2020 - 02:07 AM

TSAPO100Q, Sigma APO 1.4x tele-extender (100 x 812mm)
IEQ30pro mount
Modified Canon T3i, Astronomik L3 filter
Orion 60mm f/4 autoguider
24 x 300 sec, ISO 1600, 30 darks, 30 bias, 2x drizzle, 25% crop
PHD2, DSS, XnView, StarTools



Edited by rekokich, 23 April 2020 - 02:10 AM.


#15 rkelley61


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Posted 23 April 2020 - 09:11 PM

Captured from my backyard over several nights this month (April 10, 13, 15, 16, 18, 20, 21 and 22).


Frames:252x120" (gain: 90.00) bin 2x2

Integration:8.4 hours




Avg. Moon age:24.27 days

Avg. Moon phase:32.88%

Bortle Dark-Sky Scale:4.00

Resolution: 2220x1480


Telescope: SKYWATCHER MAK 180/2700

Camera: ZWO ASI 071MC PRO

Mount: Losmandy G11T Gemini 2

Guiding telescope:102 GT 102mm Achromatic Refractor

Guiding camera:ZWO ASI 290MM Mini

Software:NINA - Nighttime Imaging ‘N’ Astronomy,  PHD2 Guiding 2.6.6 PHD2,  Pixinsight




Full resolution: https://astrob.in/ro7uf5/0/


#16 Bretw01


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Posted 24 April 2020 - 11:17 PM

Here's my submission for this month:


Taken 4-17-2020


gain 50

30 darks

30 flats

ASI183MC Pro



Bortle 4








#17 latentfuss


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Posted 25 April 2020 - 01:32 PM

Here's my first submission to these monthly challenges.


IEQ30 pro mount

Canon EOS Rebel SL1 (ISO 800)

Canon EF 75-300mm (zoomed out to 300 mm, F5.6)


Imaged over 4/20 - 4/22 (all the lights from 4/20 were unusable, and only ~ 15 from 4/21)


~120 lights * 50 seconds (unguided)

80 darks

40 flats

40 bias


Backyard EOS, DSS, and Gimp.


This was the first time I tried a 2x drizzle in DSS and I'm pretty pleased with the result. At 300 mm NGC 2903 is a pretty small galaxy in a pretty wide field so the image is clearly cropped. This was also the first time I tried integrating frames from multiple nights, another positive experience!


NGC 2903

Edited by latentfuss, 25 April 2020 - 01:33 PM.


#18 Gene3


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Posted 28 April 2020 - 03:39 PM

My first experience with my new QHY 268C on my SVX152T. 

The structure and color in this galaxy made it a great target opportunity to test the 268C.For the camera I used an gain of 27 and an offset of 65 

My main concern was that my image scale (0.63 arcsec/pixel) was going to be a challenge for guiding but my MX+ was up to the task over the 6 night of data capture. Guiding was averaging around 0.5 arc sec/px. A coastal marine layer, dew everywhere, and messed up flat frames all contributed to noise and the blotchy background. Big thanks to Ron Brecher (AstroDoc) for his expertise in getting the best out of this data.


Image capture: Del Mar, CA - April 14,15,21,22,23, and 24. 119 subs @ 600sec each. 19.8 hours integration

25 each darks, flats, flat darks & bias

image was cropped about 50%

Processed in PI


NGC 2903 crop.jpg

Edited by Gene3, 28 April 2020 - 03:58 PM.


#19 TelescopeGreg



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Posted 28 April 2020 - 04:44 PM

Hi all,


This is 2 evenings worth of imaging, for a total of a little over 1.5 hrs of net integration.  Moon on both sides of marginal weather limited imaging time.  It could certainly use more time on target, but at least this month the target was a good match for the camera and scope (thanks!). 


It would also help if DSS would tell me what was wrong with the nearly 50 subs it threw out, so I could try to fix the cause.  I'm guessing bad stars (aka life with an AVX), but haven't tried flipping through the 261 offered subs to locate them.  I tried stacking all 261 in Sequator, and that improved the detail a bit, but it ended up with a blotchy gradient that StarTools couldn't deal with very well.  I'm guessing that's due to Sequator using Flats (aka Vignettes) but not calibrating them with Dark-Flats.  I may try making a master flat with DSS, and feeding that into Sequator.  But other than the missing subs, DSS behaved itself this month in making a nice clean stack.


As usual, the background has a "nice" pattern noise due to not dithering.  That will have to wait for a computer-controlled camera, so that CCDciel can sync the imaging and dithering operations.


Technical card:


Telescope:  Stellarvue SVA130EDT  130mm f/7  No reducer or flattener.

Camera:  Nikon D3200 DSLR, unmodified.  30 seconds, ISO 6400.  Intervalometer controlled

Mount:  Celestron AVX

Guiding:  ZWO 60mm f/4.6 guide scope, ASI174mm Mini camera

At-mount compute:  4GB Raspberry Pi-4B, Astroberry distro, CCDciel + ASTAP plate solving, PHD2 guiding


188 Lights, 30 seconds each.  20 Darks each night; 20 Flats, 20 Dark-Flats applied to both nights

Stacked in DSS, processed in StarTools.  Cropped to about 65% of original size.


Fingers crossed for better weather next month!





Attached Thumbnails

  • NGC2903 2nd, 3rd nights 188 subs 1hr 34m ISO 6400 30 sec flats in main DSS StarTools pass 2 denoised-b.jpeg

Edited by TelescopeGreg, 28 April 2020 - 04:47 PM.


#20 Dereksc


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Posted 28 April 2020 - 05:48 PM

Below is my version of NGC2903.


The beginning of April was absent clear nights however the latter half of the month provided multiple imaging opportunities enabling my submission.


My image was captured on April 13,14,15,21,23,26 and 27. NGC2903 was slipping below my artificial horizon by midnight so I did not have much astronomical dark time available for this target per night. 


Imaging telescope:Celestron C9.25 SCT
Imaging camera:ZWO ASI1600MM-C
Mount:Skywatcher EQ6R Pro
Guiding telescope:Celestron C9.25 SCT
Guiding camera:ZWO ASI174 Mini
Focal reducer:Celestron f/6.3
Software:Main Sequence Software Sequence Generator Pro 3 ,  Pixinsight
Accessories:Orion Thin Off Axis Guider TOAG ,  Rigel Systems Focuser n-Step


ZWO B 1.25": 81x100" (gain: 76.00) -15C bin 1x1
ZWO G 1.25": 75x100" (gain: 76.00) -15C bin 1x1
ZWO L 1.25": 388x30" (gain: 76.00) -15C bin 1x1
ZWO R 1.25": 73x100" (gain: 76.00) -15C bin 1x1
Integration: 9.6 hours
Darks: ~20
Flats: ~20
Flat darks: ~20
Bortle Dark-Sky Scale: 6.00

Pixel scale: 0.592 arcsec/pixel
Orientation: 224.177 degrees

Resolution: 4413x3282



Mure-denoise, crop, DBE, RGB balance and combine, color balance RGB, masked stretch RGB, sharpen L, masked stretch L, LRGB combine, curves, saturation boost.






LRGB_2020_04_27 3.jpg


Astrobin link:





#21 mdavister


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Posted 29 April 2020 - 07:23 PM

Throwing my hat in the ring for this one. In taking this one, the Luminance went ok, then when it came time to run the color filters: Red did ok, Green snagged the guide cable on the mount and I lost alignment, Blue was re-aligned but the garage started to eclipse the galaxy. Then I was waiting all the rest of the month to get the color data, but have had cloudy nights since. At least the Luminance turned out ok in my book. The processing was basic, I may go back and try and get and add the color at a later time.


Date: April 18, 2020

Scope: Meade 130mm 6000 series APO f/7

Mount: iOptron CEM60

Camera: SBIG ST-8300M with Baader LRGB filters

Lum: 25 x 360sec

R: N/A

G: N/A

B: N/A

Guide Scope: ZWO 60mm guidescope

Guide Camera: SBIG ST-i

Software: PHD2, CCDOps, PixInsight

Processing: Basic calibration (no flats unfortunately), stack, stretch







Edited by mdavister, 29 April 2020 - 07:28 PM.


#22 nmoushon


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Posted 01 May 2020 - 01:18 PM

The winner of this months challenge is TelescopeGreg! Post #19


Thanks everyone for participating. I'll put up this months challenge soon.


#23 Gene3


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Posted 01 May 2020 - 02:04 PM

Great Challenge!

Looking forward to finding out what TelescopeGreg picks for May.


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