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NGC 7161 (16,948 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




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NGC 7161

NGC 7161, GC 4720

RA: 21h 56m 57.9s
Dec: +02° 54′ 58″

Con: Pegasus
Ch: MSA:1285, U2:256, SA:17

Ref: NGC/IC, Corwin (2004)

(reference key)

Type: stars (two)

Mag: B=?, V=?

Size: ?
PA: ?

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

NGC 7161 is apparently a group of three double stars about 2 arcmin south of d'A's position. However, his two descriptions are inconsistent, with only the second suggesting his object is a cluster. Both descriptions mention the 10th magnitude star 11 seconds preceding the object, and both also mention the two flanking 14th magnitude stars (though d'A puts them at 16th magnitude, a common occurance in the 19th century before good photometry was available).

This object appeared first in GC thanks to a list of 125 new nebulae that d'A sent directly to JH; thus the entry "d'Arrest, 115" in GC. D'A next published a summary list of many of his novae in AN 1500. This object is number 194 there. Finally, when d'A's massive monograph appeared a few years later, the full observations finally appeared.

Given the problem with the declination, I'm not completely happy with the identification. Reinmuth called the object simply a double star, and RNGC followed along. The brightest of the three pairs is the northern most, so I can see why it might be taken as d'A's object. The position I give, though, is a mean for all three -- but I'm not sure that this is the correct interpretation. Perhaps a complete translation of d'A's Latin notes would help.

Published comments

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a nonexistent object. Their coded description reads ** DC.

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