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Globular star cluster M71

Globular star cluster M71 is in the constellation Sagitta (Sge).


Equatorial coordinates (epoch J2000):
Ra (α):19h53.8m, Dec (δ):+18° 47'

Visual magnitude: 8,5m
Distance from the star clusters M71 to the Sun is 18330 light years
Angular size: 7'
Class: XII
External dimensions the star clusters M71 are about 40 light years.
Estimated weight the star clusters: 40x103 suns

Discoverer: Jean-Philippe Loys de Chéseaux, 1745 year.

The designation M71 in other catalogs: NGC 6838

Optimum magnification for a telescope with observations of M71, depending on the aperture of the telescope (D), is about D/3-0.8D. 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 M71 is August. 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.

Мessier 70
Мessier 72

Nikolay Kurdyapin, kosmoved.ru  

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