Hemisphere:  Southern  ·  Constellation: Orion (Ori)  ·  Contains:  B33  ·  Flame Nebula  ·  Horsehead nebula  ·  IC 434  ·  LBN 953  ·  LBN 954  ·  Orion B  ·  Sh2-277
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Orion's horse, 



    
        

            Sendhil Chinnasamy
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Orion's horse

Getting plate-solving status, please wait...
Orion's horse, 



    
        

            Sendhil Chinnasamy
Powered byPixInsight

Orion's horse

Imaging Telescopes Or Lenses
Celestron EdgeHD 11"
Imaging Cameras
QHYCCD QHY268PH M
Mounts
ASTRO-PHYSICS AP900 CP4
Filters
Chroma 2" Blue · Chroma 2" Red · Chroma 2" Green · Chroma 2" Luminance · Chroma 2" 5nm Ha
Accessories
Moonlite Focusers Litecrawler · QHYCCD QHY CFW3-L · Prima Luce Lab EagleLE
Software
Adobe Photoshop · Pleiades Astrophoto PixInsight
Guiding Telescopes Or Lenses
Celestron EdgeHD 11"
Guiding Cameras
QHYCCD QHY OAG-M · Lodestar X2

Acquisition details

Dates:
Oct. 30, 2021 ·  Oct. 31, 2021 ·  Nov. 1, 2021 ·  Nov. 2, 2021 ·  Nov. 5, 2021 ·  Nov. 6, 2021 ·  Nov. 7, 2021
Frames:
Chroma 2" 5nm Ha: 18x300" (1h 30') (gain: 60.00) -5°C bin 1x1
Chroma 2" Blue: 15x300" (1h 15') (gain: 60.00) -5°C bin 1x1
Chroma 2" Green: 15x300" (1h 15') (gain: 60.00) -5°C bin 1x1
Chroma 2" Luminance: 212x300" (17h 40') (gain: 60.00) -5°C bin 1x1
Chroma 2" Red: 15x300" (1h 15') (gain: 60.00) -5°C bin 1x1
Integration:
22h 55'
Darks:
25
Flats:
25
Flat darks:
25
Avg. Moon age:
15.23 days
Avg. Moon phase:
13.55%
Bortle Dark-Sky Scale:
4.00

RA center: 05h41m08s.322

DEC center: -02°2704.96

Pixel scale: 0.552 arcsec/pixel

Orientation: -90.035 degrees

Field radius: 0.282 degrees

WCS transformation: thin plate spline

More info:Open 

Resolution: 2014x3072

Data source: Backyard

Description

Shooting the Horsehead Nebula up close was something I was looking forward to with this setup. 

After collecting 11 hours of L, about 6 had a couple dust motes that would shifted during imaging and would not calibrate. Since the remaining five hours were good, I am suspecting the filter wheel not returning back to the filter at the right position. I need to test this more to be sure. 

I did not want to shoot new flats, so shot another 6 hours which were good. I stacked 11 good hours and 17 total as a test and was going back and forth whether to crop the horsehead to the center and run with it. 

I was pointed to Adam Block's selective rejection video to test as the problem subs were only a fraction. After trying out, to my pleasant surprise, I had recovered all of the problem L subs and stacked all 17 hours of L subs. 

I highly recommend this video, if you ever run into dust motes that shifted and are a subset of the overall subs of a channel. 

I shot an hour of Ha one night and decided to just go with LRGB result But I still used the Ha data into the SuperLum for a subtle difference. 

Hope you like this result. Clear skies!

Adam Block's video - https://www.youtube.com/watch?v=ZZVJKo47Ctk

Comments

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Orion's horse, 



    
        

            Sendhil Chinnasamy