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Type: galaxy (HII), Sb:
Mag: B=11, V=?
Size: 2.754′ x 2.63′
PA: ?
Synonyms: H IV-060
Discovered in 1789 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "vB, R. Planetary, but very ill defined. The indistinctness on the edges is sufficiently extensive to make this a step between planetary neb and those which are described vsmbM."
A supernova erupted in this galaxy in 1974 (16.5p)
G. de Vaucouleurs ("Galaxies and the Universe", Chapter 14 - Nearby Groups of Galaxies) notes that the five brightest members of the Ursa Major I (X) group are NGC 3310, NGC 3448, NGC 3549, NGC 3445 & NGC 3458.
The RNGC (Sulentic and Tifft 1973) notes that this is a 11.5 mag galaxy. Their coded description reads IRRR,HISBCT,DIFPERIP KNY PERIPH.
Listed as No. 217 in Arp's "Atlas of Peculiar Galaxies" (Astrophysical Journal Supplement, vol. 14, 1966.) He remarks "Much hydrogen alpha emission including half arc outside galaxy"
Photo Index by Jim Lucyk: Sky&Tel. 11/84 p410.
Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "11M; 3' x 2' extent; bright and roundish and just SW of 5.5M star (SAO 27724); !good supernova prospect!."
Observing site: Pinnacles overlook
Telescope: C-11
[10h 38m 42s, 53° 30m 0s] This looks more like a planetary nebula than a galaxy. An E0? (Burnham: Sc/Irregular, Wikisky: The central regions of a face on Sc.)
Lacaille's catalogue
The Messier objects
Dunlop's catalogue
The Bennett objects
The Caldwell list
Named DSOs
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