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NGC 6728 (15,486 of 18,816)

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NGC 6728

NGC 6728, COCD 458, Isserstedt 662, VIII 13, GC 4453

RA: 18h 58m 45s
Dec: −08° 56′ 58″

Con: Scutum
Ch: MSA:1318, U2:296, SA:16

Ref: SIMBAD, NGC/IC

(reference key)

Type: asterism

Mag: B=?, V=?

Size: 16′
PA: ?

History and Accurate Positions for the NGC/IC Objects (Corwin 2004)

NGC 6728 could be Isserstedt 662, a stellar ring (though it does not look very ring-like to me). This is one minute, 13 seconds preceding and 1.6 arcminutes north of WH's position at which there is nothing. WH describes the cluster as being composed of "... coarsely scattered stars, not rich." This certainly fits Iss. 662 which is the only object in the area that WH might have picked up.

Those interested in Isserstedt's idea that the stellar rings have a constant size -- so can therefore be used as distance indicators -- can read more about them in A&A 9, 70, 1970 which gives other earlier references.

Historical observations

William Herschel (c.1784)

Synonyms: H VIII-013

Discovered in 1785 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a cluster of coarsely scattered stars, not rich."

Published comments

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a nonexistent object. Their coded description reads NO CL DC.

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