Contains: NGC 2024, NGC 2023, Horsehead nebula, IC 434, The star Alnitak (ζOri), The star σOri
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Horsehead and Flame Nebulae (fourth attempt)

Technical card

Resolution: 4320x3208

Dates: Feb. 20, 2017Feb. 23, 2017

ZWO Blue: 12x150" (gain: 150.00) -25C
ZWO Green: 23x150" (gain: 150.00) -25C
ZWO H-alpha 7nm: 19x300" (gain: 150.00) -25C
ZWO Red: 20x150" (gain: 150.00) -25C

Integration: 3.9 hours

Avg. Moon age: 25.02 days

Avg. Moon phase: 22.52% job: 1476856

RA center: 85.181 degrees

DEC center: -2.275 degrees

Pixel scale: 0.919 arcsec/pixel

Orientation: 108.831 degrees

Field radius: 0.687 degrees


I've been working a lot on my processing skills and wanted to try my hand at this subject again. I wasn't happy with how blown out Alnitak was, as well as the clearly visible reflection of my secondary, so I started from scratch and gathered new data. I still had problems with collimation (maybe focuser flex? - it looked good with the laser and cheshire both before and after attaching my camera) and with my secondary being visible (in my green subs, you can even see the focuser tube!). There is also a reflection of Alnitak present at the very top of the flame, but I was able to process out most of the aberrations and I think it looks way better than my previous attempts. Progress!



Chris Sullivan



Tried a method for reducing Alnitak and Alpha Ori.


Added more HA.


Reduced star sizes a little more.


Adjusted the curve.

Sky plot

Sky plot


Horsehead and Flame Nebulae (fourth attempt), 


        Chris Sullivan

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