3718(14sig2) (astroeyes)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: NGC 3718 · NGC 3729

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3718(14sig2)

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3718(14sig2)

A shot of 2 Arp's for the price of 1! Arp 214 and Arp 322 in Ursa Major present a fantastic sight, showing the vast scale of the universe in 1 field of view. Despite a magnitude of around 10.6 visual, the surface brightness of Arp 214, or ngc 3718 as it is more commonly known, is quite low at 14.5 but it is a fascinating study. Quite large at 9' x 5' it is an almost unique lenticular/spiral galaxy observable not far from the 'plough' at a distance of about 52 million light years. It is a LINER (Low Ionization Nuclear Emission-line Region) galaxy, whatever that is! It is disturbed and probably associated with nearby ngc 3729, top left of my image. Ngc 3729 is designated a barred spiral, but the bar is actually an absorption structure, not stars, apparently. The tiny galaxy group (Arp 322) at bottom centre is vastly further away at about 300 million light years, but I think the group provides a fascinating impression of the scale of the universe compared with the relatively nearer ngc 3718.

The background group is designated as UGC 6527 and is about magnitude 16.

Taken on one of the few good nights so far this year, the result of 36 x 180 sec exposures.

David..

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Astrometry.net job	6565178
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