61 Ursae Majoris [SEP] constellation
61 Ursae Majoris
61 Ursae Majoris (61 UMa) is an orange-yellow G8 main-sequence star in the constellation Ursa Major. It is somewhat smaller and fainter than the Sun, and can just barely be seen by the unaided eye (based on a magnitude limit of 6). Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.
No substellar companions have been observed in orbit around this star, and it appears to lack a
and beyond.
The second system comes from the English astronomer John Flamsteed's "Historia coelestis Britannica" (1725). It kept the genitive-of-the-constellation rule for the back end of his catalogue names, but used numbers instead of the Greek alphabet for the front half. Examples include 61 Cygni and 47 Ursae Majoris.
Full-sky catalogues (in chronological order).
Bayer and Flamsteed covered only a few thousand stars between them. In theory, full-sky catalogues try to list