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M41

NGC 2287

Proper NamesNone
Messier NumberM41
NGC/IC NumberNGC 2287
ConstellationCanis Major
Right Ascension6h 46m 1s
Declination-20° 45' 24"
Distancec.2,400 light years
c.700 parsecs
MagnitudeApparent: +4.5
Absolute: -4.8
DiameterApparent: 39'
Actual: 26 light years
Number of Starsc. 100
Optimum VisibilityJanuary
NotesThis open cluster contains about one hundred stars of different classes and hues, the most prominent of which is HD 49091, which shines redly in the centre of the cluster, at least from the perspective of an observer on Earth.

A broad open cluster in Canis Major, lying southward of the brilliant star Sirius. M41 covers an area of the sky slightly greater than that of the Moon's disc, though it is marginally too faint to be visible without telescopic aid.

The cluster contains about a hundred stars of different shades of oranges and blues, scattered through an area some twenty-five light years in diameter. To an observer on Earth, the brightest star in the cluster is the orange giant HD 49091, which appears to lie near the cluster's centre (though in fact it lies on edge of the cluster nearest to the Solar System).

Visible on the southeastern fringes of M41 is a blue star that outshines all the others in the field, but is not in fact part of the cluster. This blue star is 12 Canis Majoris, lying in the same direction as M41 from Earth, but only about a third of the 2,400 light years' distance to M41 itself.

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