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NGC 313
NGC 313, GC 5059
Type: stars (three)
Mag: B=?, V=?
Size: ?
PA: ?
History and Accurate Positions for the NGC/IC Objects (Corwin 2004)
NGC 313 is a triple star (the third star is very close to the northern of the brighter two) about an arcminute north west of NGC 315. Lord Rosse observed the group (NGC 311 and NGC 318 are the other two bona fide galaxies in it) on six different nights, and saw the triple as nebulous on all but one night when he noted it as a double star (his sketch was apparently made on that night as it shows N313 as a double star). His micrometric offsets from N315 on three nights point exactly to the triple.
The southern star is just bright enough that it was picked up in GSC. The position I've adopted is midway between this and the image of the northern two stars.
Historical observations
Birr Castle/Lord Rosse
The Earl of Rosse, observing with a 72-inch f/8.8 speculum telescope, recorded but did not describe NGC 313. He wrote "Nov. 29, 1850. NGC 315 is vlbM; NGC 311 has stellar point or nucleus. I suspect NGC 316 to be a faint nebula." His sketch of the four objects shows NGC 315 - NGC 311: PA 219 degrees, Dist. 5.6'; NGC 315 - NGC 313: PA 315 degrees, Dist. 1.1'; NGC 315 - NGC 316: PA 81 degrees, Dist. 0.7'. A later entry, dated November 3, 1855, records another object, NGC 318, and correctly describes NGC 316 as a star: "Three nebulae nearly in line, sp - nf; NGC 311 is bM and lE precedeing and following; NGC 315 is R, bM, with a double star N.p. and is the largest of the three; NGC 318 is S, F, R; NGC 316 is a star."
Published comments
Sulentic & Tifft (1973)
The RNGC (Sulentic and Tifft 1973) notes that this is a nonexistent object. Their coded description reads ** DC&DEVAUC.
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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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