Humason 1-2 (lowenthalm)

Humason 1-2

Acquisition type: Lucky imaging

This planetary nebula is listed in Sky Safari as Hu1-2. At 11.8 magntude, its fairly bright, but its small at only about 15 arc second across for the bright inner region. The fainter "arms" stretch out to about 25 arc second in total length. You could fit about 4 of these little guys into the hole in the Ring Nebula!

The inner bright region has an unusual shape, immediately bring to my mind aleph symbol when I first saw it. Its fairly neutral color with tinges of red and blue-green at several edges, so I suspect this nebula has strong emission in all three OIII, H-beta and H-alpha to resulting in a lack of color. Despite this, I find the overall structure quite dramatic.

One other thing that caught my eye was little blue star just above the bright yellow star at the center of the lower left quadrant. There is good parallax data on this star in the Gaia star catalog (1000/9.0177 milli-arcseconds = 110.89 parsecs), that places it at 361.5 light years away from us. Given its blue color and dim magnitude (Gaia G filter magnitude is 16.5865), I suspect its a white dwarf, given that an blue O, B or even an A star at 360 light years would be much brighter, but just the right brightness for a white dwarf. Its not list as a white dwarf in SIMBAD, so I have no confirmation of this suspicion.

This was a combination of 860 half second subs captured with an IR/UV Cut filter and stacked in FitsWork using a Bayer drizzle algorithm to achieve true 0.5 arc second pixel scale. The resulting detailed image of the core was combined with a stack of 4 eight minute live-stacked images (each composed of 320 1.5 second subs) captured through a UHC filter to bring out the fainter edges and polar knots at either end. I mixed the two sources of data to produce the result here.

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Status	Advanced success
Started	...
Astrometry.net job	3753352
PixInsight job	SW3BQKV12NGHFJ4G4FD305OGNII9DMMU
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	21h33m08s.160
RA (top/left)	21h32m55s.580
RA (top/right)	21h32m15s.231
RA (bottom/right)	21h33m20s.678
RA (bottom/left)	21h34m01s.220

Dec (center)	+39°38′12″.85
Dec (top/left)	+39°49′40″.22
Dec (top/right)	+39°32′27″.41
Dec (bottom/right)	+39°26′45″.33
Dec (bottom/left)	+39°43′56″.71

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Humason 1-2

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Humason 1-2

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