Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  NGC 4284  ·  NGC 4290
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NGC 4290 - 'Ring' Galaxy in UMa., astroeyes
NGC 4290 - 'Ring' Galaxy in UMa.
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NGC 4290 - 'Ring' Galaxy in UMa.

Getting plate-solving status, please wait...
NGC 4290 - 'Ring' Galaxy in UMa., astroeyes
NGC 4290 - 'Ring' Galaxy in UMa.
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NGC 4290 - 'Ring' Galaxy in UMa.

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Description

Here's an interesting example of a 'ring' galaxy. Ring galaxies are formed when a low mass galaxy passes through a larger spiral galaxy, usually in a near perpendicular plane triggering a burst of highly energetic and therefore short-lived, star formation in the 'ring'. This makes them quite transcient and unusual though there are a few fairly bright ones to be seen. NGC 4290 is one such ring galaxy. It lies very near to the infamous Messier object M102 (not quite shown in my picture unfortunately), in UMa. NGC 4290 is an early type ring galaxy classified as SBbc. It has a surface brightness mag. of 14.1 so it is quite bright although it's apparent visual magnitude is only 13.1and it's unlikely to be spectacular through the eyepiece. Distance is approximately 144 Mly and it measures some 2.25' x 1.5' in angular size. The galaxy at 10-o-clock is NGC 4284, a mag 14.7 type Sb-c galaxy at 200 Mly so it's unlikely that this is the interacting object. The little spiral at the 4-o-clock position goes by the rather uninspiring title of MCG +10-18-032, in case anyone's interested! Mag 17.4, distance unknown.

Taken a couple of nights ago during a rare period of excellent seeing. 10" f4.8 Newtonian / SX H9C telescope/camera. 61 X 60 secs unguided exposures. Acquired and processed in AstroArt 3.

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NGC 4290 - 'Ring' Galaxy in UMa., astroeyes