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RA: 18h 12m 18.42s
Dec: +25° 39′ 43″
Ch: MSA:1200, U2:159, SA:8
Ref: SIMBAD, Corwin
Type: galaxy (in group)
Mag: B=15.4, V=?
Size: 0.436′ x 0.338′
NGC 6581 = IC 1280. The position that Stephan quotes for his comparison star is off by about 15 seconds of time, so the NGC position for the galaxy is also off by the same amount. Digging into the data a bit more suggests that there is an additional 2 second error in Stephan's RA, but his description "... between two very small stars" is exactly right.
Bigourdan, of course, could not find N6581 at its catalogued position, but rediscovered it at its true position. Thinking it was a "nova," he included it in his third list of new nebulae. He saw it only on one night, and commented then that it is "Impossible to measure, because I cannot easily distinguish it from 2-3 vF neighboring stars." His position is therefore based on a single estimate from the same star that Stephan used, and points to the same galaxy.
The RNGC (Sulentic and Tifft 1973) notes that this is a 15.5 mag galaxy. Their coded description reads DB,R,SLDIF,BM,KNY.
The Messier objects
The Bennett objects
The Caldwell list
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