61 Ursae Majoris
From Wikipedia, the free encyclopedia
| Observation data Equinox J2000 |
|
|---|---|
| Constellation | Ursa Major |
| Right ascension | 11h 41m 03.02s |
| Declination | +34° 12′ 05.9″ |
| Apparent magnitude (V) | 5.31 |
| Characteristics | |
| Spectral type | G8 Ve |
| U-B color index | 0.26 |
| B-V color index | 0.72 |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | -5.4 km/s |
| Proper motion (μ) | RA: -13.95 mas/yr Dec.: -380.46 mas/yr |
| Parallax (π) | 104.81 ± 0.72 mas |
| Distance | 31.1 ± 0.2 ly (9.54 ± 0.07 pc) |
| Absolute magnitude (MV) | 5.41 |
| Details | |
| Mass | 0.81 M☉ |
| Radius | 0.84 R☉ |
| Luminosity | 0.57 L☉ |
| Temperature | 5,580 K |
| Metallicity | 40-105 % Sun |
| Rotation | ? |
| Age | 0.5-1.0 × 109 years |
| Other designations | |
61 Ursae Majoris is an orange-yellow main sequence dwarf star in the constellation Ursa Major. This star 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).
No sub-stellar companions have been observed in orbit around this star, and it appears to lack a dust ring as is found around some comparable stars. It lies near the same line of sight as the sub-giant star HD 101212, although it is presently unclear whether these two stars are gravitationally bound or even in physical proximity.
[edit] In fiction
In the science fiction of Larry Niven, 61 Ursae Majoris is depicted as the home system of the warlike extraterrestrials known as Kzin.
