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Messier 109
NGC 3992, LEDA 37617, MCG+09-20-044, UGC 6937, Messier 109, IV 61, h 1030, GC 2635
Type: galaxy, SBb
Mag: B=10.7, V=?
Size: 7.079′ x 4.57′
PA: 68°
Image gallery
Photos (1)
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Historical observations
William Herschel (c.1784)
Synonyms: H IV-061
Discovered in 1789 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "cB, bright resolvable nucleus with very faint extended branches about 30 degrees np-sf. 7' or 8' long, 4 or 5' broad."
Published comments
Supernovae
A supernova erupted in this galaxy in 1956 (12.0p)
Sulentic & Tifft (1973)
The RNGC (Sulentic and Tifft 1973) notes that this is a 11.0 mag galaxy. Their coded description reads SB,ALMRG,BWD ARMS.
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 Ursa Major I (N) Group are NGC 3992, NGC 3953, NGC 3631, NGC 3898 & NGC 3718.
Modern observations
Tom Lorenzin
Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "10M; 8' x 5' extent; soft oblong with little brighter, non-stellar core; 13.5M star 1' NW of core; 11.5 and 12.5M star pair in SW reaches; bright Gamma UMA 40' to NW."
Contemporary observations
Tom Bryant
2009-05-12 22:15:00
Observing site: Little Bennett Regional Park
Telescope: C-11
[11h 57m 36s, 53° 23m 0s] Large, faint ellipse, with a small, bright nucleus. The transparency was not good tonight. Heavy dew. This might have looked better in darker skies.
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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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