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... М32 < М33 > М34 ...

Spiral galaxy M33

Spiral galaxy M33 or Triangulum galaxy is in the constellation Triangulum (Tri).


Equatorial coordinates (epoch J2000):
Ra 01h33.9m, Dec +30° 39'

Visual magnitude: 5,7m - this object can be seen with the naked eye on a black sky, in the absence of illumination from street lighting.
Distance from the galaxy M33 to the Sun is 2,74*106 light years
Angular size: 71'×42'
Class: Sc
External dimensions the galaxy M33 are about 60000 light years.
Number of stars: 40x109
Estimated weight the galaxy: 10-40x109 suns
The mass of the central object (black hole): 3-10x103 suns

Discoverer: Giovanni Battista Hodierna, before 1654 year.

The designation M33 in other catalogs: NGC 598

Optimum magnification for a telescope with observations of M33, depending on the aperture of the telescope (D), is about D/6-D/4. 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 M33 is November.

Nikolay Kurdyapin, astro-map.com  
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