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Type: galaxy, Sc
Mag: B=12.87, V=11.99
Size: 2.398′ x 2.238′
Select a sketch and click the button to view
Discovered by John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "pretty bright, slightly elongated, gradually a little brighter in the middle; has an 8th mag star 5' distant, pos. S.p." On a second occasion he called it "pretty faint, irregularly round, or triangular; gradually brighter in the middle; resolvable; 40 arcseconds."
Burnham calls this a 12.9 mag barred spiral galaxy in Centaurus, 1.5' x 1.4', pretty bright, considerably small, elongated, gradually a little brighter in the middle with a small nucleus.
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).
The RNGC (Sulentic and Tifft 1973) notes that this is a 13.0 mag galaxy.
QBS: SB(rs)bc I-II. * (fntr than 13.5?) 30" SE, 1'.1 E/sl S.
SGC: SB(r)bc II.
15cm - mod f @ 80x. 140x: seems elong sl SE-NW, but two nrby *s confuse (both m13.5): one in SE side, the other outside halo ESE. 1'.2 diam w/mod even concen to sub*ar nuc. BS, 3Mar1990, LCO.
Date: 2008 April 10, Thursday night
Location: Sutherland (town, Jurg's guest house)
Sky conditions: Dark, clear
Telescope: 12-inch f/4.9 Dobsonian
Eyepieces: 25mm Sirius Plossl, 60x, 46' fov & 10mm Sirius Plossl, 150x, 14/17' fov
Working on MSA chart 953, star hopping from Omega Centauri.
Tonight's first target, this galaxy is just over a degree due south of Omega Centauri, making for an easy star-hop. It is conventiently placemarked by a 7.7th mag star (HD 117036) four arcminutes south-southwest.
The galaxy is readily seen at 60x as a small round glow, just under an arcminute across, and growing not much brighter towards the middle.
Between HD 117036 and NGC 5156 lies a small square of stars (rough field sketch); the galaxy is larger than this square.
The Messier objects
The Bennett objects
The Caldwell list
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