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RA: 21h 56m 57.9s
Dec: +02° 54′ 58″
Ch: MSA:1285, U2:256, SA:17
Ref: NGC/IC, Corwin (2004)
Type: stars (two)
Mag: B=?, V=?
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.
The RNGC (Sulentic and Tifft 1973) notes that this is a nonexistent object. Their coded description reads ** DC.
The Messier objects
The Bennett objects
The Caldwell list
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