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... М39 < М40 > М41 ...
Optical pair of stars M40
Der offene Sternhaufen M40 or Winnecke 4 Optical pair of stars is in the constellation Ursa Major (UMa).
Equatorial coordinates (epoch J2000):
Visual magnitude: 9m
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. 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.
Nikolay Kurdyapin, astro-map.com
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