Abell 61 (DoubleStarPhotography)

Abell 61

Abell 61 is a very faint and ancient planetary nebula in Cygnus. It is located somewhere around 4,500 light years away and its age is estimated to approximately 22,000 years. The central star's apparent brightness is ~17mag, and its surface temperature is over 60,000 K.

The apparent diameter of Abell 61 is about 3.3 arc minutes, so it is similar in size to the more well known M97 Owl nebula, but Abell 61 is almost a 1000 times fainter! M97 shines at magnitude 9.9, where as Abell 61 is at magnitude 17.39. That results in a 7.49 (17.39 - 9.9) order of magnitude difference in apparent brightness. Applying Pogson's equation, 2.512 raised to the power of 7.49 = 991 times fainter than M97!

I captured this image over one of the recent Canadian smoke filled nights here in Maryland a couple weeks back, so not sure how well my dual band filter was able to counter balance the haze high in the skies that night. The Moon was present in the sky as well, but not significantly so.

Abell 61 is actually quite faint, requiring 3 mins subs to reveal the nebula clear enough for me to confirm placement in the frame....which I didn't quite manage to get centered as you can see! ;-)

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Title: Center crop (2006x2006 pixels) for a closer look

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Status	Advanced success
Started	...
Astrometry.net job	7912189
PixInsight job	9NCQ9KRVHC69UUDDA153NISG108X7P9U
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	19h19m03s.929
RA (top/left)	19h17m13s.522
RA (top/right)	19h17m04s.882
RA (bottom/right)	19h20m55s.723
RA (bottom/left)	19h21m01s.644

Dec (center)	+46°13′33″.21
Dec (top/left)	+45°53′01″.90
Dec (top/right)	+46°32′42″.90
Dec (bottom/right)	+46°33′58″.45
Dec (bottom/left)	+45°54′16″.57

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