NGC6842 (lowenthalm)

Celestial hemisphere: Northern · Constellation: Vulpecula (Vul) · Contains: NGC 6842 · PK065+00.1 · Sh2-95

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NGC6842

Acquisition type: Lucky imaging

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NGC6842

Acquisition type: Lucky imaging

I have an a few images that I had intended to post and never gotten back to. Here is one of a planetary nebula in Vulpecula from way back in 2019 captured from my backyard without just and IR/UV Cut filter.

The several super red stars in the field are in fact super red carbon stars. They emit more than 100 times less blue light (5 magnitudes!) less blue light than they do red. The cocoon of carbon dust in their atmospheres absorb most of the green and blue wavelengths of visible light, allowing only red and longer wavelengths to escape.

I looked at the Gaia data for the what appears to be the progenitor star at the center of the nebula in order to get an idea of the distance to the nebula. Pre-Gaia mission estimates from 2008 put the distance to the nebula at around 1380 parsecs. The Gaia distance to the bright central star is 2,099 parsecs. If this is the progenitor star or star system, that would give the 70 arc second wide nebula a true diameter for about 2.3 light years. I calculated the V magnitude from the Gaia magnitudes for the candidate progenitor star and got about 16.1 magnitude. Combining this with the distance gives this star an absolute visual magnitude of around 4.5, which makes it look like an F star still on the main sequence. So maybe this is a binary, with the one star still on the main sequence while the other is fading after producing this planetary nebula.

Either way, its a lovely blue-green object rich in OIII emission!

Each of the four images stacked here were 8 minute live stacks of 480 x 1 second exposures.

All
Planetary Nebula

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Status	Advanced success
Started	...
Astrometry.net job	4739742
PixInsight job	UVIM3OQ86GYC0NF7VO1CH2LM9UTCR6EH
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	19h55m02s.423
RA (top/left)	19h55m14s.420
RA (top/right)	19h54m29s.534
RA (bottom/right)	19h54m50s.846
RA (bottom/left)	19h55m35s.302

Dec (center)	+29°17′11″.39
Dec (top/left)	+29°23′55″.66
Dec (top/right)	+29°17′46″.12
Dec (bottom/right)	+29°10′28″.29
Dec (bottom/left)	+29°16′36″.31

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