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Hawaiian Astronomical Society

Constellations: Canes Venatici -- Boötes Hunting Dogs


M51 is actually a pair of spiral galaxies that are being shaped by their gravitational interaction. NGC5194 is the larger galaxy, weighing roughly 100 billion times as much as the sun. It is about three times larger than its companion galaxy, NGC5195. We find M51 3.5° SW of Alkaid, the final star in the Big Dipper's handle. Dreyer describes it as "great spiral nebula." This mag. 9 galaxy shows spiral structure in a 6" telescope. Size is 9'x7.5'.

M63 (NGC5055) is a very bright (mag. 9.7), large (15'x9'), elongated (120° PA), spiral galaxy located between M51 and Cor Caroli (alpha Canum Venaticorum). It is sometimes called the Sunflower Galaxy.

NGC5005 (Best 40, Caldwell 29) is a spiral galaxy located .2° ESE of Cor Caroli (alpha Canum Venaticorum). Dreyer calls it very bright (mag. 10.9), very large (5.7'x2.7'), and very elongated (PA 66°). It has an extremely bright nucleus embedded in a larger, bright lens. Larger scopes will see several knotted arms. NGC5033 (Best 41) is the other significant galaxy 41' to the south-east. Described as very bright (mag. 10.6), fairly large (11'x5'), and elongated (PA 167°), it features a sharply defined, very bright, bulging nucleus, and a spiral pattern of dark lanes. The other somewhat obvious galaxy, 26' south of NGC5005, is the mag. 14.4 NGC5002. The quite faint (mag. 13), very large (6'x5.5'), and irregularly shaped IC4182 lies 1.2° WNW of 5005.

M94 (NGC4736) is a very bright (mag. 8.7), large (14'x12'), elongated (105° PA), spiral galaxy located 3 ° NW of Cor Caroli (alpha Canum Venaticorum).

NGC4631 (Best 38, Caldwell 32) is a spiral galaxy located 6.4° SSW of Cor Caroli (alpha Canum Venaticorum). Dreyer calls it very bright (mag. 9.3), very large (14'x2'), and very elongated (PA 86°). It has a bright, slightly off-center nucleus with a star just north of it. NGC4627 is the small galaxy just 2'-3' to the north. NGC4656 (Best 39) is the other large galaxy 32' to the south-east. Described as fairly bright (mag. 10.6), large (15'x3'), and very elongated (PA 34°), it, too, has a faint companion to the north (NGC4657) that is partly superimposed.

M3 (NGC 5272) is a fine (mag. 6.4, size 16') globular cluster located near the Boötes and Coma Berenices border. Dreyer describes it as extremely bright, very large, with a condensed core. He estimated the stars shone at mag. 11, i.e. a 3" refractor in a dark sky could begin to resolve this one.

NGC4490 (Best 37) is the brighter (mag. 10.3) of an interacting galaxy pair. The fainter (mag. 12.5) galaxy is NGC4485. Dreyer describes 4490 as very bright, very large (7'x3.5'), and moderately elongated in PA 130. NGC4485 is bright, fairly small (3'x2.5'), and somewhat out of round. You find them both .7° WNW of Chara (Beta Canum Venaticorum).

NGC4449 (Best 36, Caldwell 21) is a mag. 10.1 irregular galaxy located 2.9° NNE of Chara (beta Canum Venaticorum). Dreyer says it is very bright, quite large (6'x4.5'), and moderately elongated. He also calls it extremely resolvable. He means it should be possible to see bright and dark areas surrounding a stellar nucleus.

M106 (NGC4258) is a mag. 9.3 galaxy located in the NW section of the constellation. It features bright knots in its spiral arms.

NGC4244 (Best 35, Caldwell 26) is an edge on spiral galaxy located 7.6° due west of Cor Caroli (alpha Canum Venaticorum). Dreyer calls it pretty bright (mag. 10.6), very large (19'x2.3'), and extremely elongated (PA 48°). It has a stellar nucleus, and is the northern element of a pair of galaxies. NGC4214 (Best 34) is an irregular galaxy lying 1.5° south of NGC4244. Dreyer's description reads: quite bright (mag. 10.2), quite large (8.4'x6.6'), irregular extended, with a double nucleus. The double nucleus requires larger aperture. An 8" may show no nucleus at all. It is the southern element of the pair. NGC4190 (mag. 13.2, 1.6'x1.5') lies 30' to the north-west of NGC4214.

NGC4111 (Best 33) is an edge on spiralish galaxy located near the Ursa Major border, 6° south-east of Chi Ursae Majoris, and 5.2° WNW of Chara (Beta Canum Venaticorum). Dreyer's description reads very bright (mag. 11.6), fairly small (4.5'x0.9'), and moderately extended (p.a. 151°). It has a stellar nucleus. NGC4111 anchors a host of much fainter galaxies, none brighter than mag 14. These include UGC7089 just over the border in Ursa Major (mag. 14.4, 3.2'x0.7', 13'WNW), NGC4109 (mag. 14.8, 1', 5'SSW), and NGC4117 (mag. 14, 1.8'x0.9', 8'ENE).