NGC/IC Project Restoration Effort

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NGC3932

 

Basic Information


Location and Magnitude


Right Ascension: 11:51:53.0
Declination: +48:40:3
Constellation: UMA
Visual Magnitude: 13.6

Historic Information


Discoverer: d'Arrest
Year of discovery: 1861
Discovery aperture: 11.0

Observational


Summary description: vF, v diffic, II 740 np
Sub-type: *

Corwin's Notes

===== NGC 3932 is a star. D'A has only one observation of it included in his AN 1500 list (where it is No. 125), and in the shorter list (where it is No. 84) that he sent to JH for inclusion in GC (where the NPD is 6 arcsec larger than the NGC NPD). He chose to not include it in his big 2nd monograph; Wolfgang suggests that this was because d'A knew it was a star by that time. In the AN list, d'A describes it as "vF, S. Companion of h. 999 [N3928]," while in the GC, the description reads "vF, v diffic, H.II.740 np." JH is surely responsible for substituting his father's catalogue number for his own, but I suspect that the "v diffic" comes from d'A. I would guess that d'A prepared the two lists at different times from the same observing logs. Perhaps the logs have both "S" and "v diffic" in them. In any event, the faint galaxy chosen by CGCG is not d'A's object -- it is 17 arcmin off his position, and is probably too faint for him to have seen with his 11-inch refractor. RC1 got it right: In the note for NGC 3928, the de Vaucouleurs say "NGC 3932 sf 5.5 arcmin is a star." They also have a reference to Reinmuth (1926, "Die Herschel-Nebel", in Vol. 9 of the Heidelberg publications) who gave the NGC position (d'Arrest's), a diameter of 0.3? x 0.3? arcmin, and the description "* 11.0 in eeF neb?" Reinmuth also classified the object as "(c)" on Wolf's system -- this means a star (or stellar nucleus) surrounded by a corona of faint nebulosity. There is, however, no trace of nebulosity surrounding the star on POSS1 or on POSS2.