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RA: 01h 08m 16s
Dec: +61° 35′ 42″
Ch: MSA:49, U2:16, SA:1
Ref: SIMBAD, DAML02, Archinal&Hynes (2003), Skiff20080430-s
Type: open cluster, 31m
Mag: B=?, V=9.3
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Discovered by Caroline Herschel.
Synonyms: H VIII-064
Discovered in 1787 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a forming cluster of pretty compressed stars. Caroline Herschel discovered it in 1783."
Trumpler (Lick Obs Bulletin, Vol 14, No. 420) gives the diameter as 7' and the class as III 2 p.
Photo Index by Jim Lucyk: Vehrenberg's Atlas of DS Splendors (3ed) p29.
Phelps and Janes give the outer cluster radius as 3.17arcminutes and list the minimum number of cluster members as 71. They include a plotted image of the cluster. [Phelps, R. L. & Janes, K. A. (1994) "Young Open Clusters as Probes of the Star Formation Process. 1. An atlas of open cluster photometry" Astrophys. J. Suppl. Series, 90:31-82.]
The RNGC (Sulentic and Tifft 1973) notes that this is a 9.5 mag open cluster.
Listed by the Herschel Club, described as "Some 24 stars counted, large in size and fanning outwards. Yellow and orange-red stars stand out in this cluster with a number of bright stars seen in field of view. 8-inch, 48x."
Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes the mag as 11.0 and comments: "5' diameter; 40-plus faint members; 1.5 degrees NE of Gamma CAS; 35' to NW is OPN CL N366."
POSS: not concen on W or anywhere. dbl * is triple noted in 25cm with nrby
WDS: Stein 185: 10.8,12.5; 8".1; 129. (V=11.0,13.1)
8cm - f circ spot w/a little broad concen. 5' diam. unres @ 20x. BS, 28Nov1983,
15cm - mod f `avg cl. 5' diam w/50 *s counted @ 140x. m11 * in N side is wide
un= pair. remainder m12.5+. unconcen. 50' fld shows patchy light & dk
areas in Milky Way bkgrnd. BS, 10Dec1990, Anderson Mesa.
25cm - 10' diam w/30 *s. W side condensed. quite f @ 90x.
- nice, 8'-10' diam, hazy @ 47x. on N center is un= triplet. mod concen and
30cm - 8' diam. seems to be a clot of bkgrnd *s. member *s m11.5+. 40 *s. vloose
w/a few strings. br m10.5 * 3' N.
Observing site: Little Tycho Observatory
[1h 8m 18s, 61° 35m 0s] A round group of ~ 30 faint stars, 12-14mv. A chain of ~7 12mv stars runs NE-SW through it.
The Messier objects
The Bennett objects
The Caldwell list
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