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RA: 12h 49m 54.15s
Dec: −41° 16′ 46.4″
Ch: MSA:934, U2:402, SA:21
Type: galaxy (in cluster), S...
Mag: B=13.8, V=?
Size: 1.348′ x 0.676′
Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "vF, vS, R, psbM, 10 arcseconds."
No nebula here. Exposure 80 minutes. See No. 275, Table II.
No 275: " B, vS, alm.stell." The reported position is 12:44:03, -40°29.9 (1900)
De Vaucouleurs (1956) "Survey of bright galaxies south of -35° declination", Mem. Mount Stromlo, No. 13. (photographic study, plates taken with the 30-inch Reynolds reflector, 20-inch diaphragm). In the Notes: note 'no neb here' in Helwan Bull 22 is wrong and it is not = Helwan 276; measured coordinates [RA] as in NGC, [Dec] 2.2' n of NGC pos.]
The RNGC (Sulentic and Tifft 1973) notes that this is a galaxy. Their coded description reads R,BM,ELDIF HALO.
Sandage (1975(Astrophysical Journal, 202, 563-582) notes that this galaxy is a member of the Centaurus Cluster. Members include NGC 4645, NGC 4677, NGC 4683, NGC 4696, NGC 4706, NGC 4709, NGC 4743, NGC 4744 & NGC 4767.
Shobbrook (1966, Mon. Not. R. astr. Soc., Vol 131, p351-363) notes that this member of the Centaurus Cluster has V = 13.10, B-V = 1.07 and U-B = 0.54. It measures 1.1 by 0.4.
Gerd Bahr-Vollrath (Noosa Heads, Queensland, Australia) observing with an 8-inch f/12 SCT, writes in The Webb Society Nebulae and Clusters Section Report No. 10, July 1992: "One of the many faint and challenging galaxy clusters in Centaurus. All of these galaxies were at the threshold of visibility, and some may even have been a product of my imagination. The galaxies appeared as very indistinct diffuse glows, barely brighter than the background sky. Definitely a challenge for 20-cm telescopes."
15cm - pretty f, vsm. elong NE-SW, 25"x15" w/mod sharp concen to sub*ar nuc. BS, 27Feb1990, LCO.
The Messier objects
The Bennett objects
The Caldwell list
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