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RA: 21h 34m 7.62s
Dec: −36° 39′ 12.1″
Ch: MSA:1427, U2:382, SA:23
Ref: SIMBAD, Corwin
Type: galaxy, SBc
Mag: B=15.5, V=?
Size: 1.862′ x 1.258′
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.
Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "eF, pL, vgbM, 2', place considerably uncertain, having been found when much past meridian in searching in vain for Dunlop 561. This nebula is much too faint to have been seen with 9 inches aperture. It precedes a star 6m nearly in the parallel, about 40 seconds of time."
Paturel, G., Petit, C., Kogoshvili, N. et al. (1991) An extragalactic data base. IV. Errors and misprints in catalogues of galaxies. Astrophys.J.Suppl.Ser., 91(3), 371.
NGC 7091 = MCG –6-47-7.
The RNGC (Sulentic and Tifft 1973) notes that this is a galaxy. Their coded description reads SM,BM,DIF,*ORCOM S.
The Messier objects
The Bennett objects
The Caldwell list
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