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Pentagon
NGC 6776, AM 1920-635, ESO 104-53, LEDA 63185, SGC 192038-6357.6, Pentagon, h 3787, GC 4483
Type: galaxy, S...
Mag: B=12.95, V=11.99
Size: 1.862′ x 1.548′
PA: 15°
Historical observations
John Herschel (1847) Cape Observations
Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "pB, R, psbM, 15 arcseconds."
NGC/IC Dreyer (1888, 1895, 1908)
The NGC describes it as "pretty bright, small, round, pretty gradually brighter towards the middle."
Published comments
Shapley, H. & Ames, A. (1932)
Shapley, H. & Ames, A. (1932) A survey of the external galaxies brighter than the thirteenth magnitude. Annals Harvard College Obs., 88(2), 43.
Position given in NGC corrected by that published by Reinmuth's Die Herschel Nebel.
Stewart (1908) Ann.Harv.Coll.Obs., 60 (6)
Table IV: Position corrected.
de Vaucouleurs, G. (1956)
De Vaucouleurs (1956) "Survey of bright galaxies south of -35° declination", Mem. Mount Stromlo, No. 13. (photographic study, plates taken with the 30-inch Reynolds reflector, 20-inch diaphragm). p8: "coordinates corrected." In the Notes to the catalogue: "measured RA 19h 12m 11s (186) = 19h 20.7m (1950). Both the original NGC value of the RA and the corrected value given in Dreyer's third list of errata (IC II, p 195, after D. Stewart, HA 60, 156) are incorrect and so is the corresponding value in HA 88, 2. The NGC description and NPD are correct."
Sandage (1975)
Sandage (1975(Astrophysical Journal, 202, 563-582) notes that this galaxy is a member of the NGC 6769 Group. Members include NGC 6739, NGC 6769, NGC 6770, NGC 6771, NGC 6782, IC 4827, IC 4831, IC 4842 & IC 4845. Possible additional members include NGC 6753, NGC 6758, NGC 6780, NGC 6776, IC 4837, IC 4839 & IC 4889.
Sulentic & Tifft (1973)
The RNGC (Sulentic and Tifft 1973) notes that this is a 13.0 mag galaxy.
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Favourite lists
Lacaille's catalogue
The Messier objects
Dunlop's catalogue
The Bennett objects
The Caldwell list
Named DSOs
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