Andrew Cooper
Jul 19, 2023    Oregon Star Party, Ochoco Mts, OR (map)
25cm f/4.5 Newtonian, Holoholo @ 71x
Seeing: 7 Transparency: 6 Moon: 0%

A dense cluster of stars well detached from the surrounding rich galactic starfield, bright and obvious, rich, resolved, roughly circular about 12' in diameter, a large number of 10th to 12th magnitude stars embedded in a glow of fainter members

Andrew Cooper
Dec 1, 2021    Waikoloa, HI (map)
20cm f/6 Newtonian, Cave Astrola @ 76x
Seeing: 7 Transparency: 5 Moon: 0%

A rich open cluster seen against a rich galactic starfield, bright and obvious, fully resolved, the central concentration is about 10' in diameter, very rich with 10 to 12th magnitude stars, the 8th magnitude SAO 20606 is on the western margin, the cluster is 1° south of 4 Cas

Andrew Cooper
Oct 21, 2006    TIMPA, Avra Valley, AZ (map)
12x36 Canon Image Stabilized Binoculars

Bright and distinct despite being in a heavy galactic starfield, small, not resolved

Andrew Cooper
Aug 27, 2006    TIMPA, Avra Valley, AZ (map)
28cm f/10 SCT Gypsy

A bright well defined open cluster, rich, quite clumpy in appearance with a few notable voids, well over 10' in diameter and reasonably round, homogeneous with a fairly small magnitude variation

Andrew Cooper
Sep 30, 2005    Gila, New Mexico (map)
90mm F/12 APO Violet Haze

Rich! a circular patch with a much brighter 8.2 mag. star on one side, resolved but with a mist of unresolved stars surrounding, visible in 9x63 binoculars, a good binocular object

Andrew Cooper
Nov 14, 1998    Empire Mts., Pima Co., AZ (map)
20cm f/10 SCT

Rich star cluster, roughly circular and well resolved

Rev. T.W. Webb
May 19, 1885    Hardwick, Herefordshire, England (map)

Irregular with orange star, as is frequently the case.

― Celestial Objects for Common Telescopes, T. W. Webb, 1917

Charles Messier
Jan 7, 1774    

Cluster of very small stars, mingled with nebulosity, which can be seen only with an achromatic telescope. It was when he observed the Comet which appeared in this year that M. Messier saw this cluster, which was close to comet on the 7th of September 1774; it is below the star d Cassiopeiae: that star was used to determine both the cluster of stars & the comet.

― Connaissance des Temps, 1781

Drawings, descriptions, and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission.

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