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RA: 18h 27m 12s
Dec: −12° 02′ 0″
Ch: MSA:1343, U2:295, SA:15
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 21m
Mag: B=?, V=11.7
Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "cluster VII class, p rich, 5' diameter, with appendages, stars 12..15m. Much richer than any part of the mlky way seen to-night."
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 4.5' and the class as 1 2 p.
The RNGC (Sulentic and Tifft 1973) notes that this is a 11.5 mag open cluster.
Pluto camera plate: 15/25cm pair: 12"; pa225.
15cm - some haze amongst 12-15 *s @ 150x. BS, 7Aug1980, Anderson Mesa.
- dbl * res. brtr *s at each end of elong grp. about 17 *s vis @ 125x. BS,
15Mar1981, Anderson Mesa.
- rel f cl but consp by being mostly surrounded by dk areas. res @ 80x.
140x: 6' diam w/15 *s res mostly m13+, but one m11.5 * on NW. broad
concen. in wk *ry band running NE-SW. BS, 21Jun1990, Anderson Mesa.
25cm - vis @ 50x, nice cl 6'-8' diam. *s scattered w/mild concen. about 30 *s
m11-14 incl m11.5 pair isolated on S side. BS, 7Aug1980, Anderson Mesa.
- 6'x3' in pa 150, 35 *s @ 190x. m11 * on NW end, M10.5 on SE end. pair:
11,11.5;10";pa230. BS, 15Mar1981, Anderson Mesa.
The Messier objects
The Bennett objects
The Caldwell list
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