IC 289 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: IC 289 · PK138+02.1

IC 289

This object is a small planetary nebula located 5000 light years away in the constellation of Cassiopeia. The nebula is 40 arc-seconds wide in our apparent view, which corresponds to a diameter of 1 light year.

There is not much written about this object in the literature, except that it is "unremarkable". The central progenitor star is clearly visible. Confirmed by the Hubble image, there appears to be a faint outer gaseous sphere expelled by the star at the beginning of its planetary nebula stage, followed by a second stronger inside sphere. Reddish hydrogen gas is present throughout the nebula, but the expelled oxygen gas is more concentrated at the expanding leading edge of the inside sphere, particularly in the 4 slightly brighter lobes around the circumference.

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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.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
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.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	3980634
PixInsight job	XHP7BUX5EF37IUAJBU3YDMZKN4VP8U32
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	03h10m19s.660
RA (top/left)	03h11m03s.259
RA (top/right)	03h09m30s.738
RA (bottom/right)	03h09m34s.918
RA (bottom/left)	03h11m07s.213

Dec (center)	+61°19′03″.00
Dec (top/left)	+61°23′06″.58
Dec (top/right)	+61°22′21″.20
Dec (bottom/right)	+61°14′58″.90
Dec (bottom/left)	+61°15′43″.46

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IC 289

IC 289

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IC 289

IC 289

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