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NGC 6861
NGC 6861, IC 4949, Dunlop 425, ESO 233-32, LEDA 64136, SGC 200341-4830.9, h 3811, GC 4540
Type: galaxy, S0
Mag: B=12.1, V=11.1
Size: 2.951′ x 1.995′
PA: 140°
History and Accurate Positions for the NGC/IC Objects (Corwin 2004)
NGC 6861 = IC 4949, which see.
Historical observations
Dunlop, James (1827)
James Dunlop discovered this object from Paramatta, New South Wales, and included it as No. 425 in his catalogue of 1827. Using a 9-inch f/12 telescope, he described it as "a very small faint nebula, about 15 arcseconds diameter."
John Herschel (1847) Cape Observations
Observed by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "B, S, lE, pgmbM, 20 arcseconds." On a second occassion he called it "B, S, E, gpmbM, 25 arcseconds."
Published comments
Bailey, S.I. (1913)
Bailey, examining a Bruce plate (Harvard Annals, Vol 72, No 2), describes it as "probably = CPD -48 deg 10326, nebulous?"
de Vaucouleurs, G. (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 to the catalogue: "IC 4949 is same object."
NGC 6861A is first described in 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). Measures 0.95x0.75.
Paturel et al. (1991)
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 6861 = IC 4949
Sandage, A. (1975) ApJ, 202, 563
(Astrophysical Journal, 202, 563-582) notes that this galaxy is a member of the Telescopium Group. Members include NGC 6851, NGC 6861, NGC 6861D, NGC 6868, NGC 6870, NGC 6875, NGC 6878, NGC 6890, NGC 6893, NGC 6902, NGC 6909 & ESO 285- G 7.
Sandage, A. et al. (1975) Galaxies and the Universe
G. de Vaucouleurs ("Galaxies and the Universe", Chapter 14 - Nearby Groups of Galaxies) notes that the five brightest members of the NGC 6861 Group are NGC 6868, NGC 6861, ESO 285- G 7, NGC 6902 & NGC 6893.
Sulentic & Tifft (1973)
(Sulentic and Tifft 1973) notes that this is a 12.5 mag galaxy.
Shobbrook (1966)
Shobbrook (1966, Mon. Not. R. astr. Soc., Vol 131, p351-363) notes that this member of the Telescopium Cluster has V = 11.58, B-V = 1.06 and U-B = 0.55. It measures 1.25 by 0.53.
Melotte, P.J. (1915)
A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.
Modern observations
Brian Skiff
15cm - mod br @ 80x, making triangle w/two m12.5 *s E & NE. 140x: circ, 40" diam w/strong even concen to f *ar nuc. BS, 12Nov1993, LCO.
Contemporary observations
Magda Streicher
2006 April 07
Alldays
12-inch f/10 SCT (76x, 218x, 346x)
Conditions: Good
The galaxy displays a bright core imbedded in a soft oval haze, which seems slightly more off centre to the SE. It could also be that the galaxy is slightly more, brighter towards this eastern part. This shade of light is elongated in a SE to NW. A 10.2 magnitude star show the way to IC 4943 which can be seen as a soft smutch of light towards the NW in the field 76x. With 218x, IC 4943 shows up as a soft elongated NE to SW glow barely seen.
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Favourite lists
Lacaille's catalogue
The Messier objects
Dunlop's catalogue
The Bennett objects
The Caldwell list
Named DSOs
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