NGC 4236 OSC +Ha (John Favalessa)

Celestial hemisphere: Northern · Constellation: Draco (Dra) · Contains: NGC 4236 · PGC 2729018 · PGC 2729999 · PGC 2730166 · PGC 2730848 · PGC 2730972 · PGC 2731136 · PGC 2731233 · PGC 2731503 · PGC 2731666 · PGC 2731962 · PGC 39118 · PGC 39369

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NGC 4236 OSC +Ha

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NGC 4236 OSC +Ha

Another backyard galaxy, ho hum? No way! What a fantastic and beautiful galaxy to study. It's one of our relatively close neighbors while not as dramatic as M82 or M81, I found it enjoyable to capture and process.

In this image I blended Ha after extracting from dual narrowband data using APP which has a great tool for us OSC camera users. I had to boost the Ha more than I usually do. You can see nebula in the first and second arms top and bottom. Like most of us, I wanted to get more on this target, but alas cloudy now for a while and the moon is waxing.

from the various web sources: NGC 4236 (also known as Caldwell 3) is a barred spiral galaxy and is a member of the M81 Group, at a distance of approximately 11.7 MLY's. It is large (its length is more than 2/3 the Moon’s width) but has a very low surface brightness, meaning it is barely brighter than the background glow of the sky (mean surface brightness is 24.3 mag/asec2; outer arms are much fainter). This makes it quite a difficult object to image.

(I wish I could say I understood that 2nd to the last sentence 🤪)

SoCal Astrophotography
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Status	Advanced success
Started	...
PixInsight job	4M867B8F6QXY5Z8CC2C0JZLUW52HN8R4
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	12h16m44s.825
RA (top/left)	12h19m19s.841
RA (top/right)	12h19m15s.701
RA (bottom/right)	12h14m04s.599
RA (bottom/left)	12h14m18s.958

Dec (center)	+69°28′33″.29
Dec (top/left)	+69°06′57″.41
Dec (top/right)	+69°50′33″.33
Dec (bottom/right)	+69°50′01″.41
Dec (bottom/left)	+69°06′28″.24

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