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RA: 18h 05m 29s
Dec: −36° 17′ 48″
Ch: MSA:1437, U2:377, SA:22
Type: open cluster
Mag: B=?, V=?
NGC 6529 was apparently first seen by James Dunlop who claimed two observations of it. His description reads, "A pretty large faint nebula, round figure, 5' or 6' diameter, resolvable into very minute stars, with nebula remaining."
Unlike most of Dunlop's nebulae, JH claims to have seen this one, though only once. He lists an estimated position that is close to Dunlop's and calls it "A large milky way patch, much compressed, one portion much more so."
However, checking the position on the SERC IIIa-J film shows nothing more than a rather unremarkable part of the Milky Way. Nothing stands out that strikes me as something that would catch an observer's eye. Compare this to other Milky Way fields that have NGC numbers (e.g. NGC 6476 and NGC 6480) from JH's sweeps -- there is nothing obvious here. I've put the nominal position in the table.
I also checked the other nebulae seen in the same sweep; all are at about the same declination, so there is no large error in that part of JH's observation. A large RA error is possible, but I found nothing in the obvious places (plus or minus one minute, ten minutes, etc.).
Perhaps a visual observer can turn up something here.
James Dunlop discovered this object from Paramatta, New South Wales, and included it as No. 569 in his catalogue of 1827. Using a 9-inch f/12 telescope, he described it as "a pretty large, faint nebula, round figure, 5' or 6' diameter, resolvable into very minute stars, with nebula remaining."
Observed by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "a large milky way patch, much compressed, one portion much more so."
The RNGC (Sulentic and Tifft 1973) notes that this is a nonexistent object. Their coded description reads NOCL S.
Sagittarius; 18h 05m -36 18
To me, it is just a patch of the Milky Way.
The Messier objects
The Bennett objects
The Caldwell list
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