Andrew Cooper
Aug 23, 2023    Waikoloa, HI (map)
20cm f/6 Newtonian, Cave Astrola @ 76x
Seeing: 7 Transparency: 7 Moon: 0%

Bright and obvious, a 7' diameter collection of 10th to 12th magnitude stars 1° east-northeast of Ruchbah, quite distinct in rich galactic starfield, the 7th magnitude HD 9311 on the northwest margin, the 9th magnitude rich orange star SAO 11826 sits just east of the cluster center, another 9th magnitude star V1122 Cas forms a 14" double with HD 9311 at the northwestern margin, three brighter stars (HD 9311, the 8th magnitude V1132 Cas, and the 10th magnitude TYC 4031-558-1) form a conspicuous 4' trangle that frames the cluster giving the overall cluster shape a notably triangular appearance

Andrew Cooper
Jun 27, 2020    Waikoloa Quarry, HI (map)
8x42mm Nikon Prostaff 3S Binoculars @ 8x
Seeing: 7 Transparency: 7 Moon: 0%

A small clump just 1° northeast of Ruchbah, small at 5', not resolved

Andrew Cooper
Aug 19, 2017    Oregon Star Party, OR (map)
14.5" f/4.5 Starmaster @ 103x
Seeing: 7 Transparency: 7 Moon: 0%

A striking equilateral triangle marked by three brighter stars (7.2, 8.1, and 10.4 mag) encloses a swarm of fainter memebers, halfway along the northeastern edge is a notably ruddy star (8.5 mag)

Andrew Cooper
Oct 22, 2016    Kaʻohe, Mauna Kea, HI (map)
51cm f/4 Newtonian, Obsession #004 @ 169x
Seeing: 7 Transparency: 6 Moon: 0%

A striking cluster with a notable triangular shape, bright, large, about 5' in diameter, three brighter stars delineate the corners of an equalateral triangle, almost all of the obvious members are within this area, somewhat concentrated at the northern end of the trinagle

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

Small, bright, just barely resolved, easy to find just off of δ Cas (1° northeast)

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

Rich, in a rich galactic star field, a dim triangle of stars dominated by two bright stars at either end, the body of the cluster shows much better with averted vision.

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

Triangular cluster easily identified once I looked up the photo in Burnham's, bright stars at each corner

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

Beautiful field. 1° f a little n of δ, containing Σ131 supra, and red star.

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

Captain William Henry Smyth
Aug 29, 1832    No. 6 The Crescent, Bedford, England (map)
150mm f/17.6 refractor by Tully 1827

A neat double star in a cluster, on Cassiopea's knee, about a degree to the nf of δ. A 7, straw coloured; B 9, dusky blue [HD 9311 mag. 7.29 and V1122 Cas mag 9.71]. This is a fan-shaped group, diverging from a sharp star in the nf quadrant. The cluster is brilliant from the splash of a score of its largest members, the four principal ones of which are from the 7th to the 9th magnitude; and under the largest, in the sf, is a red star of the 8th magnitude [BD+59 274 mag 8.54], which must be that mentioned by H., No. 126 of his Catalogue of 1833.

My attention was first drawn to this object, by seeing it among Σ.'s acervi; but I soon found that it was also the 103 which Messier describes so vaguely, as being between δ and ε Cassiopeæ, whereas it is pretty close to δ, on the Lady's knee.

― A Cycle of Celestial Objects Vol II, The Bedford Catalogue, William Henry Smyth, 1844

John Herschel
Oct 27, 1829    

The chief star in a cluster of class VI or VII of 8' diameter, which has one very red star near the middle; stars between 9th and 12th magnitude.

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

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