Collinder 65

Magnitude A / B / C
Separation A-BC/ AC
Position angle A-BC / AC
Spectral class A / B / C
Colour A / B / C
: 05 26.05 / +16.42
: 140
: 3.0
: 219
: ?
: 430
Detail sketch:
Date / Time
Observing Location
Seeing / Transparency
Magnification / Field of View '
: 08/02/11 / 21.30
: Landgraaf
: 3 / 4
: 8x40 Binocular/SkyWindow
: -
: 8 / 480
Collinder 65

Observing Report

Collinder 65 lies on the Orion-Taurus Border. A real treat when observed through binoculars, even if they only are 40mm one’s. Although the cluster (as I found out later when checking the data) is actually smaller than the whole field of view of 8 degrees, it is an overall interesting and appealing star field to look at and to sketch.

So what did I see in the field of view? A medium to rich field of 50+ stars scattered over a field of view of 8 degrees, with quite some variety in magnitude ranging from very bright to barely visible. The sketch was not very hard to do, because a lot of the stars are arranged in different geometric shapes or in chains. I see a clear (crooked) chain of bright stars in the north, running from East to West. To the south a see a rather bright group of five stars forming a kite, be it a kite that is warped. Then their are many smaller groups of faint stars arranged in chains, triangles, arrows, or just simple double’s.

There are definitely empty areas and dark lanes visible. There is no real central star, and I don’t detect any glow of nebulosity or unresolved stars. The one star that stands out the most, is a bright orange one, right at the northern edge of the field of view. This is Tau 119, a magnitude 4.4 star of spectral type M2Iab-1b (supergiant). There are no other stars in Collinder 65 that show any colour
Collinder 65 finder chart

Image from Voyager by CapellaSoft


A search on the internet showed that there is very little known and/or written about Collinder 65. Besides one or two observing reports and sketches, I could not find any information on this large open cluster.