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NGC 6222 = NGC 6216, which see.
Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "a very large, very rich cluster, not brilliant, not materially compressed in the middle, full 20' diameter, stars 12..13th mag." Also see NGC 6216.
Bailey, examining a Bruce plate (Harvard Annals, Vol 72, No 2), describes it as "rich region of milky way."
Trumpler (Lick Obs Bul, Vol 14, No. 420) notes: "Melotte 152 should be identified with [NGC 6216] and not with NGC 6222."
Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.
Discussed, based of F-A plates.
The RNGC (Sulentic and Tifft 1973) notes that this is a 10.0 mag open cluster.
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
Melotte gives his cluster No. 152 = NGC 6222; however, Trumpler (Lick Obs Bul, Vol 14, No. 420) notes: "Melotte 152 should be identified with [NGC 6216] and not with NGC 6222."
Coe, observing with a 17.5" f/4.5 at 100X, notes: "Pretty faint, pretty large, somewhat elongated, 30 stars and a fuzzy backround at 135X.
The Messier objects
The Bennett objects
The Caldwell list
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