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... М39 < М40 > М41 ...

Optical pair of stars M40

Optical pair of stars M40 or Winnecke 4 星团 is in the constellation Ursa Major (UMa).


Equatorial coordinates (epoch J2000):
Ra 12h22.2m, Dec +58° 05'

Visual magnitude: 9m
Angular size: 0,8'

Discoverer: Charles Messier, 1764 year.

The designation M40 in other catalogs: WNC 4

Optimum magnification for a telescope with observations of M40, depending on the aperture of the telescope (D), is about >10x. 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 M40 is April.

Nikolay Kurdyapin, astro-map.com  
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