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... М108 < М109 > М110 ...

Spiral galaxy M109

Spiral galaxy M109 is in the constellation Ursa Major (UMa).

M109

Equatorial coordinates (epoch J2000):
Ra 11h57.6m, Dec +53° 23'

Visual magnitude: 9,8m
Distance from the galaxy M109 to the Sun is 67,5*106 light years
Angular size: 8'×5'
Class: SBbc
External dimensions the galaxy M109 are about 137000 light years.
Estimated weight the galaxy: 250x109 suns

Discoverer: Pierre François André Méchain, 12.03.1781 year.

The designation M109 in other catalogs: NGC 3992

Optimum magnification for a telescope with observations of M109, depending on the aperture of the telescope (D), is about D/6-D/3. Higher magnifications of course add details, but lead to a strong drop in the brightness of the image, making it difficult to observe.
The best month for observing M109 is April.


Nikolay Kurdyapin, astro-map.com  
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