NGC 7102
DSS image of NGC 7102
Overlaid DSS image of NGC 7102, 30' x 30' with north at top and west to the right

Aladin viewer for the region around NGC 7102
IC 5127, PGC 67120, MCG+01-55-008, UGC 11786, SDSS J213944.57+061710.8

Type  Galaxy
Magnitude  13.5
Size  0.637' x 0.42' @ 105°
Right Ascension  21h 39' 44.6"  (2000)
Declination  6° 17' 11" N
Constellation  Pegasus
Description  F, pL, R
Classification  SBb
Observing Notes

Harold Corwin

IC 5127 is probably identical to NGC 7102. Bigourdan's position is just five seconds of time too large, and his description is appropriate. However, he dates his three measurements to the same night on which he made three measurements of NGC 7102 (these reduce to the correct position).

Since I've not yet found Bigourdan's error -- if there is one -- I'm not prepared to say for sure that the two objects are identical. However, it seems likely. See IC 2120 for a case where we are sure that Bigourdan saw the "same" object on the same night, yet apparently thought that it was a nebula once and a comet the next!

One curious thing while I'm here: Bigourdan's comparison star for NGC 7102 (BD+5 4840) is almost exactly at its BD position, while that for IC 5127 (BD+5 4837) is nearly 4 arcmin away, as large an error as I've seen in the BD. Was this really the star that Bigourdan used? I don't see anything on the POSS1 prints that might be the star/galaxy pair matching Bigourdan's measurements (the galaxy being -3.83 seconds and -5 arcmin 44.0 arcsec from the star).

So, a mystery -- but the objects are probably identical. But I'd certainly like to know what went on that evening in the western dome of the Observatoire de Paris.
IC Notes by Harold Corwin
Other Data Sources for NGC 7102
Nearby objects for NGC 7102
Credits...

Drawings, descriptions, and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission.

A complete list of credits and sources can be found on the about page

NGC 7102