56 Ursae Majoris
56 Ursae Majoris (56 UMa) is a star in the constellation Ursa Major. Its apparent magnitude is 5.03. It is a single-lined spectroscopic binary with an orbital period of about 45 years. The companion star is likely a heavy neutron star born by a supernova that exploded around 100,000 years ago.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 11h 22m 49.58373s |
| Declination | +43° 28′ 57.7267″ |
| Apparent magnitude (V) | 5.03 |
| Characteristics | |
| Spectral type | G7IIIBa0.3 |
| U−B color index | +0.82 |
| B−V color index | +1.02 |
| Astrometry | |
| Radial velocity (Rv) | 1.01 ± 0.05 km/s |
| Proper motion (μ) | RA: -37.42 mas/yr Dec.: -14.26 mas/yr |
| Parallax (π) | 6.12 ± 0.27 mas |
| Distance | 530 ± 20 ly (163 ± 7 pc) |
| Orbit | |
| Period (P) | 16911+438 −401 d |
| Semi-major axis (a) | 22.9+1.0 −1.1 au |
| Eccentricity (e) | 0.562+0.012 −0.012 |
| Inclination (i) | 68+3.6 −3.4° |
| Longitude of the node (Ω) | 60+3 −3° |
| Periastron epoch (T) | 2468401+432 −385 |
| Argument of periastron (ω) (secondary) | 286+2.3 −2.3° |
| Details | |
| 56 UMa A | |
| Mass | 4.3 ± 0.2 M☉ |
| Surface gravity (log g) | 2.3 ± 0.6 cgs |
| Temperature | 4917 ± 34 K |
| 56 UMa B | |
| Mass | 1.31+0.11 −0.12 M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.