| Type | Open Cluster |
|---|---|
| Magnitude | 4.1 |
| Size | 8' |
| Right Ascension | 7h 18' 41.5" (2000) |
| Declination | 24° 57' 15" S |
| Constellation | Canis Major |
| Description | Cl, pL, Ri, (30 CMA) |
| Classification | I 3 p n |
Andrew Cooper
Mar 2, 2019 Kaʻohe, Mauna Kea, HI (map)
28cm f/10 SCT, NexStar 11" GyPSy @ 127x
Seeing: 6 Transparency: 7 Moon: 0%
A lovely cluster centered on the bright star τCMa, a hundred or so stars in 10' area, Tau itself is a bright blue-white at mag 4.4 with a dim companion at mag 10 just 8" away
Andrew Cooper
Feb 6, 2018 Waikoloa, HI (map)
20cm f/6 Newtonian, Cave Astrola @ 127x
Seeing: 7 Transparency: 7 Moon: 0%
A distinctive cluster huddled closely around the bright τCMa, a triangular shaed area 5' on a side filled with 7-10th magnitude stars, bright, resolved, coarse, and lovely
Andrew Cooper
Mar 29, 2016 Waikoloa, HI (map)
28cm f/10 SCT, NexStar 11" GyPSy @ 127x
Seeing: 7 Transparency: 6 Moon: 0%
A beautiful cluster groupd around τCMa, bright, coarse, fully resolved, about 30 stars arranged in an area about 10' in diamter centered on the bright star, Tau itself is blue-white at 4.4 magnitude, there is an 8th magnitude companion 1' east
Andrew Cooper
Nov 17, 2009 Hale Pohaku, HI (map)
46cm f/4.5 Newtonian, Deep Violet @ 95x
Seeing: 7 Transparency: 7 Moon: 0%
Beautiful in a big 'scope and a dark sky, a bold cluster in a heavy starfield, a few dozen bright members clustered around the bright τCMa (mag 4.4), <10' in diameter and triangular in shape
Andrew Cooper
Feb 9, 2007 Waimea, HI (map)
76mm f/6 APO
Splendid cluster set off by and centered on τCMa, a dense triangular cluster, resolved, brighter members embedded in a bright haze, grand region at the base of CMa, h3945 located just north.
Andrew Cooper
Mar 30, 2002 Sycamore House, Tucson, AZ (map)
20cm f/10 SCT
Excellent cluster centered on the 4th magnitude star Tau CMa, a couple dozen 9th and 10th magnitude stars arranged in a triangular area 5' across, empty zone near Tau except for one close companion, somewhat sparse, bright, a favorite star party object for me
Drawings, descriptions, and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission.
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