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Lacaille I.13 (15,736 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




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Lacaille I.13

Lacaille I.13, Dunlop 69, NGC 6777, GC 4484

RA: 19h 27m 15s
Dec: −71° 34′ 55″

Con: Pavo
Ch: MSA:1530, U2:456, SA:26

Ref: [1755MmARS..??..194L ], Cozens PhD 2008

(reference key)

Type: stars (two)

Mag: B=?, V=?

Size: ?
PA: ?


Lacaille I.13 is taken to be the two stars HD 181464 (SAO 257686; V=8.3, 19h 26m 44.66s, -7127'57.9") and HD 181354 (SAO 257685; V=8.0, 19h 26m 19.90s, -7127'57.4").

Wolfgang Steinicke (Historic NGC 2009) lists it as two stars, and Glen Cozens (2008) lists it as an asterism, "2 stars 8th to 9th magnitude".

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

NGC 6777 may be NGC 6752 (first suggested by Owen Gingerich in a Sky and Telescope article which appeared in the February 1960 issue on page 207). If so, there is a large error in Lacaille's position.

Much closer to his position is a fairly close pair of 9th magnitude stars, SAO 257685 and 257686. These were mentioned by Delisle Stewart in his Harvard Annals 60 list, and were subsequently picked up by Andris Lauberts for ESO-B. Would these two stars look like "the nucleus of a small comet" in the eyepiece of Lacaille's half-inch aperture quadrant? Perhaps. But I like Gingerich's idea a bit better.

Historical observations

Lacaille (1755)

Lacaille's J2000.0 position is 19h 27m 15s 71 34' 55".

His description reads: "It resembles the preceding" i.e. "It resembles a small nucleus of a faint comet."

Dunlop, James (1827)

Dunlop 69 is recorded as "(43 Pavonis, Bode's Catalogue.) I cannot find the nebula answering to this place: perhaps there may be a mistake in the right ascension."

Published comments

Stewart (1908) Ann.Harv.Coll.Obs., 60 (6)

NGC 6777: Table IV: Not seen, 2 * nr magn 8 or 9, but no neb.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a galaxy.

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