NGC/IC Project Restoration Effort

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NGC7091

 

Basic Information


Location and Magnitude


Right Ascension: 21:34:7.7
Declination: -36:39:14
Constellation: GRU
Visual Magnitude: 12.6

Historic Information


Discoverer: Herschel J.
Year of discovery: 1834
Discovery aperture: 18.3

Observational


Summary description: eF, pL, vgbM, * 6 f 40s
Sub-type: SBd

Corwin's Notes

===== NGC 7091 = IC 5114. JH found this on 1 September 1834, about 6 months after he began observing from the Cape of Good Hope. He says of it "... place considerably uncertain having been found when much past the meridian in searching in vain for Dunlop 561." The RA and NPD are both given only to full minutes of time in his CGH Observations. Unfortunately, he precesses this imprecise (and inaccurate) position to 1860 and gives it to 0.1 seconds of time and NPD in GC. The only indication that it is an approximate position is on the "Number of times observed by H and h" -- that is given as "1::". Dreyer either ignored or missed that, so the object came into the NGC with its position given nominal accuracy (1 second of time and 0.1 arcmin of NPD) and with no note. The galaxy is a good ways off JH's position (1m 20s preceding, 7.5 arcmin north), but can be positively identified by JH's note "It precedes a * 6m nearly in the parallel, about 40 seconds of time." Swift's position is even further off -- see the IC 5114 entry for that story.

Steve's Notes

===== NGC 7091 17.5" (9/7/96): extremely faint, very small, round, 20" diameter. Requires averted vision and finder chart to pinpoint location but once identified could nearly hold continuously. Probably only viewed core as listed dimensions are much larger. Located 7' W of mag 6.9 SAO 213103. Not found on a previous attempt.