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... М30 < М31 > М32 ...

Spiral galaxy M31

Spiral galaxy M31 or Andromeda galaxy is in the constellation Andromeda (And).

M31

Equatorial coordinates (epoch J2000):
Ra 00h42.8m, Dec +41° 16'

Visual magnitude: 3,4m - this object can be seen with the naked eye.
Distance from the galaxy M31 to the Sun is 2,57*106 light years
Angular size: 3,17°×1°
Class: Sb
External dimensions the galaxy M31 are about 157000 light years.
Number of stars: 1000x109
Estimated weight the galaxy: 300-400x109 suns
The mass of the central object (black hole): 140x106 suns

Discoverer: Known since antiquity, as visible to the naked eye in a really black sky. year.

The designation M31 in other catalogs: NGC 224

Optimum magnification for a telescope with observations of M31, 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 M31 is October.


Nikolay Kurdyapin, astro-map.com  
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