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RA: 13h 21m 12.81s
Dec: −43° 42′ 16.4″
Ch: MSA:933, U2:403, SA:21
Type: galaxies (interacting), E:
Mag: B=12.64, V=11.51
Size: 1.737′ x 1.737′
Discovered by John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "bright, pretty large, round; 60 arcseconds." His second observation records it as "pretty faint, round, 30 arcseconds. The third of four." The galaxies in this group are NGC 5082, 5086, 5090 & NGC 5091.
Burnham calls this a 12.9 mag elliptical galaxy in Centaurus, 1.2' x 1', pretty bright, pretty large and round.
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).
A supernova erupted in this galaxy in 1981 (14.5p)
The RNGC (Sulentic and Tifft 1973) notes that this is a 13.0 mag galaxy. Their coded description reads E,R,BM,EONCOM=5091SF.
Bergwall et.al. (1978(Astron. Astrophys. Suppl. 33, 243-255) gives this galaxy's B-magnitude in the Johnson system as 13.3. They remark: "Elliptical with large outer envelope. In pair with IG 04 [NGC 5091]."
Photo Index by Jim Lucyk: Cat.of South.Peculiar Gal.and Ass. Vol 2 (Arp&Madore, 1987) p2.6.
Lick: f * 0'.5 E, br * 5' N. gx N5091 1'.3 E.
POSS: 1'.2 sep.
ESO-LV: B=12.59, 13.94.
15cm - not found in dk sky.
- dbl gx in common envelope. main gx on NW is 1'.75x1' oval w/mod even
concen. comp is sup at SE end (whole mess elong SE-NW), seems circ maybe
15" across and w/o much concen, but grainy. BS, 3Mar1990, LCO.
25cm - found in dk sky @ 180x, but lo altitude.
Date: 2008 April 11, 21:15, Friday night
Location: Sutherland (quarry)
Sky conditions: Clear, moonlight.
Telescope: 12-inch f/4.9 Dobsonian
Eyepieces: 25mm Sirius Plossl, 60x, 46' fov & 10mm Sirius Plossl, 150x, 14/17' fov
One of a fascinating group of galaxies, about a degree south-west of Centaurus A. I counted six galaxies in the field of view, which was wonderful. The brightest of the group is NGC 5090.
However, just as I started to sketch the field, dew ended the session. Rats.
Stellenbosch (Paradyskloof rifle range)
6-inch f/8 Newtonian
Conditions: NELM 5.8 at the pole. Thin cloud in the distance.
MSA chart 933 shows it just southwest of a star. With some attention I could make out the galaxy as an almost stellar, very faint, smudge.
From "Observing log, 2004 March 24"
Rifle Range, 6-inch f/8
But my target was the Centaurus galaxy cluster, so I hurried on to nearby NGC 5090. MSA chart 933 shows it just southwest of a star. With some attention I could make out the galaxy as an almost stellar, very faint, smudge.
Alldays (22.50S, 20.12E, 770m).
12-inch f/10 SCT (218x, 346x)
The larger of the two and very hazy and round overall. The round shape is evedent, slowly getting brighter to the middle. Galaxies to the west which need to be observed better.
Sky Conditions:The fainter parts of the Milky Way are barely visible.Haziness only visible on the horizon.Atmosphere stable with little interference.
This galaxy's oval like shape looks like an out of focus peanut and that this galaxy's tiny minute disk has the resemblance of a faint smudge of light and that the surface brightness of this galaxy is extremely low and very faint.Only the central nucleus of this galacy is just seen at 75x.This galaxy measures 3.1'x 2.5'.
The Messier objects
The Bennett objects
The Caldwell list
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