English  |  Русский  |  Deutsch  |  Español  |  Italiano  |  Português  |
... 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).

M40

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  
Liked?   or tell your friends:

Copyright © 2018, astro-map.com
At a reprint of materials from this site link to the astro-map.com obligatory.
info@astro-map.com