NGC 3198 (lowenthalm)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: NGC 3198 · PGC 2264390 · PGC 2265240 · PGC 2266114 · PGC 2269711 · PGC 2270011 · PGC 2270602 · PGC 30160

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NGC 3198

Acquisition type: Lucky imaging

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NGC 3198

Acquisition type: Lucky imaging

All those great galaxies in Ursa Major are returning to our skies and it stopped raining and cleared up for a few days over the last couple weeks! I spent some time on a couple of nights with good seeing this hansom galaxy. Only one night had really good seeing, while the next was just ok. However, the transparency was great both nights, reducing light pollution problems somewhat which permitted the fainter outer regions of this galaxy to show through.

This spiral is about 45 million light years away, and is actually a bit smaller than our own galaxy at roughly 85000 light years across.

Among the background galaxies are about a dozen mostly faint quasars. The brightest quasar is 19.4 magnitude SDSS J101957.78+452949.2 just to the lower right of the pair of bright stars to the lower right of the galaxy. This quasar has a redshift of 1.96219, putting it at about 11.1 billion light years away. The dimmest quasar's in the background are close to 22nd magnitude, around the limit of the image. There is also a fairly bright 18th magnitude white dwarf which is the intensely blue star in the double star at the bottom center (its paired with a very orange star). The white dwarf is only 534 light years away, pretty close to home in the grand scheme of things.

Each of the 13 eight minute live-stacks that were stacked to to create this image were composed of 240 two second exposures.

Suburban Astrophotography
ZWO ASI 294MC PRO
Astrophotography with Dobson

All
Bests
Galaxies - big!

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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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Status	Advanced success
Started	...
Astrometry.net job	3267625
PixInsight job	EHP1RNEXGQPTDBWZT9JJCFBIMSN9IB30
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	10h19m56s.391
RA (top/left)	10h19m00s.604
RA (top/right)	10h18m54s.554
RA (bottom/right)	10h20m51s.668
RA (bottom/left)	10h20m58s.774

Dec (center)	+45°33′18″.15
Dec (top/left)	+45°49′13″.10
Dec (top/right)	+45°18′05″.15
Dec (bottom/right)	+45°17′20″.20
Dec (bottom/left)	+45°48′28″.25

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