UGC1840 (Arp 145) Irregular galaxy (lowenthalm)

Celestial hemisphere: Northern · Constellation: Andromeda (And) · Contains: PGC 2180614 · PGC 2181991 · PGC 9060 · PGC 9062 · TYC2835-119-1 · TYC2839-1623-1 · TYC2839-25-1 · TYC2839-2530-1 · TYC2839-303-1 · TYC2839-45-1 · TYC2839-77-1 · TYC2839-87-1

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UGC1840 (Arp 145) Irregular galaxy

Acquisition type: Lucky imaging

Powered byPixInsight

UGC1840 (Arp 145) Irregular galaxy

Acquisition type: Lucky imaging

Arp 145, aka UGC 1840, MCG+07-06-002 or LEDA/PGC 9062 (pick your galaxy catalog!) is a distant disrupted spiral galaxy in Andromeda. It looks me to actually be a pair of galaxies mid-interaction, at least one of which is a spiral. The other galaxy might be either a small tight spiral or a small elliptical galaxy. This object is fairly dim at only 14.1 magnitude in blue and is just 1.3 arc minutes across. Its red shift is z=0.01793, putting it at about 250 million light years away from us. At this distance, a diameter of 1.3 arc minutes works out to close to 100,000 light years across for the entire object. This makes this interesting object roughly the same size as our own galaxy.

I like its pairing with the two bright stars. The brighter star is HD 14622 (5.795 V mag) which is quite "close" to us at only 156 light years. It has a spectral class of F0III-IV and an absolute visual magnitude of 2.4, so it is a fairly hot subgiant star which is considerably larger and bluer than our sun. The dimmer star, HD 14633 (8.73 V mag), is considerably more distant at roughly 16,000 light years away. Given this distance estimate, its absolute magnitude is -4.8, so it's in truth the brighter star. Its spectral type for this star is listed in SIMBAD as ON8.5V, making it a very hot giant star. This high temperature gives it the intensely blue color seen here.

I imaged this back in October of 2020, but never got back to process much of the backlog of data I had collected late in 2020. It was a weird year. I am working through the late 2020 data now, so I will be posting more of this imagery soon.

Each of the 8 images stacked to produce this image were a live-stacks of 320 x 1.5 second exposures.

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Status	Advanced success
Started	...
Astrometry.net job	5097917
PixInsight job	111DIT29DJU0BLM1D88P4ELS9IXMLPOJ
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	02h23m06s.622
RA (top/left)	02h22m45s.613
RA (top/right)	02h22m09s.331
RA (bottom/right)	02h23m27s.519
RA (bottom/left)	02h24m04s.880

Dec (center)	+41°23′01″.80
Dec (top/left)	+41°35′31″.56
Dec (top/right)	+41°15′29″.72
Dec (bottom/right)	+41°10′29″.66
Dec (bottom/left)	+41°30′30″.15

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UGC1840 (Arp 145) Irregular galaxy

UGC1840 (Arp 145) Irregular galaxy

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UGC1840 (Arp 145) Irregular galaxy

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