... М99 < М100 > М101 ...

Spiral galaxy M100

Spiral galaxy M100 is in the constellation Coma Berenices (Com).

Equatorial coordinates (epoch J2000):
Ra (α):12^h22.9^m, Dec (δ):+15° 49'

Visual magnitude: 9,3^m
Distance from the galaxy M100 to the Sun is 49,6*10⁶ light years
Angular size: 7'×6'
Class: SBbc
External dimensions the galaxy M100 are about 107000 light years.
Estimated weight the galaxy: 200x10⁹ suns

Discoverer: Pierre François André Méchain, 15.03.1781 year.

The designation M100 in other catalogs: NGC 4321

Optimum magnification for a telescope with observations of M100, 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 M100 is May. At this time, the object is at midnight near its highest point in the sky, that is, it is less affected by light from the lanterns and atmospheric distortions.

For observers in the northern latitudes:the night sky in May is no longer very dark, so try also to observe M100 in April.
Of course, in April the object is at midnight not at its highest point, whichprovides the least exposure and atmospheric distortion. But, the darkness of the April sky greatly increases the contrast.The farther south the location of your observation is located, the darker the summer sky will be.

Мessier 99

Мessier 101

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