Corvus

Transit Date of principal star:
24 March

Corvus is a small, faint, and very old constellation. Corvus, the Crow, was called the Raven by ancient Greeks. The story goes that Apollo sent the raven, or crow, to collect water in the nearby cup ("Crater" = goblet). But the bird wasted its time eating figs. Then, as an excuse for losing time, it gathered up the Water Snake (Hydra) in its claws and flew back, telling Apollo that this creature was the reason for its delay. Apollo would have none of it, and threw all three: the crow, the goblet, and the water snake, into the heavens. For penance, the crow was made to suffer eternal thirst (and this makes the bird caw raucously instead of sing like normal birds). Corvus has only a few Bayer stars. As for possible objects of interest, there are two double stars, a variable, and a curious deep sky object. Double stars in Corvus: Zeta Corvi is an optical binary: 5.0, 13.0; PA 66º, separation 11". Delta Corvi is a fixed binary: 3.0, 9.2; PA 214º, separation 24". The wide separation makes it a fine object for small telescopes; its colour contrast adds to the attraction: a white primary and purplish (or lilac) companion. Struve 1669 is a pleasant double of equal stars: 6.0, 6.0; PA 309º, separation 5.4". The binary is five degrees north-northeast of delta Corvi. Incidentally, 1.5 degrees north of this binary is M104 (Sombrero Galaxy) in Virgo. Variable stars in Corvus: R Corvi is a long-period variable with a range from 6.7 to 14.4 every 317.03 days. In 2000 the maximum should occur in the latter half of April. Deep Sky Objects in Corvus: There are no Messier objects in Corvus, but there is one deep sky object of some interest: the curiously shaped Ringtale Galaxy. NGC 4038 (the Ringtale Galaxy) is a rare type of galaxy classified as "pecular". It resembles a foetus more than anything else. Speculation has suggested it may show two galaxies in collision, or one galaxy that has broken up, split in two. However, long-exposure photography to required to bring out any detail. Burnham (pp 720-721) reproduces a number of photographs. The galaxy is located 3.7 degrees west-southwest of gamma Corvi. It's about 90 million light years away. A printed version of this web site ["The Constellations Pocket Guide"] is available, covering all 88 constellations and their graphics.

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