NGC/IC Project Restoration Effort

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NGC3097

 

Basic Information


Location and Magnitude


Right Ascension: 10:3:58.4
Declination: +60:4:59
Constellation: UMA
Visual Magnitude: 14.1

Historic Information


Discoverer: Austin
Year of discovery: 1870
Discovery aperture: 15.0

Observational


Summary description: Neb *? 2' np h 662
Sub-type: *

Corwin's Notes

===== NGC 3097. I cannot find this one. Here are the original observations from the Harvard Annals, Vol. 8, Part 1, page 62, 1882: "Date GC RA (1860.0) Dec Remarks 1870 Mar.24 -- 09 54 19.6 +60 47 58.2 G.C. 1998 s f neb; p 45 deg s 2'. [Place only approximate.] 1870 Mar.24 1998 09 54 36.7 +60 46 33.3 G.C. 1998: F; S; R; mbMN." There are three things to note about these observations: 1) The position of the second (GC 1998 = NGC 3102) is from the GC. 2) The "p 45 deg s 2' " means that the first (N3097) is 2' away from GC1998 at a position angle of 45 degrees. This is inconsistent with the position which implies the object to be northwest, not northeast, of N3102. 3) Both observations are credited to E. P. Austin, and there is a note for N3097: "Perhaps a nebulous star. It is half-way between G.C. 1998 and a star 11 magn." The positions don't tell us anything we don't already know since they are correctly transfered into NGC from GC and the Harvard list. Since Austin was observing with a 15-inch telescope, I don't think that he could have seen either of the faint stars Glen Deen measured during his MicroSky project. The magnitude estimate given by Austin for the "star 11 magn" is rough since there is nothing that bright near the galaxy. WH had this to say (N3102 = H III 916): "eF, vS, Stellar. Near a S st." And JH: "F, vS, R, bM; a coarse D * nf points to it; has a * 11 30 [arcsec] dist, pos 142.2 deg ." All of JH's stars are identifiable, and I think that his star 11 must be the same one mentioned by WH and by Austin. So, where does that leave N3097? My guess is that Austin has misidentified another nebula as N3102, but I don't see it or its purported companion in the area. A more thorough search may turn them up.