Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ursa Major |
Right ascension | 11h 22m 49.58373s [1] |
Declination | +43° 28′ 57.7267″ [1] |
Apparent magnitude (V) | 5.03 [2] |
Characteristics | |
Spectral type | G7IIIBa0.3 [3] |
U−B color index | +0.82 [4] |
B−V color index | +1.02 [4] |
Astrometry | |
Radial velocity (Rv) | 1.01 ± 0.05 [5] km/s |
Proper motion (μ) |
RA: -37.42
[1]
mas/
yr Dec.: -14.26 [1] mas/ yr |
Parallax (π) | 6.12 ± 0.27 mas [1] |
Distance | 530 ± 20
ly (163 ± 7 pc) |
Orbit [6] | |
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 [6] | |
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 |
56 Ursae Majoris (56 UMa) is a star in the constellation Ursa Major. Its apparent magnitude is 5.03. [2] It is a single-lined spectroscopic binary with an orbital period of about 45 years. [5] The companion star is likely a heavy neutron star born by a supernova that exploded around 100,000 years ago. [6]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ursa Major |
Right ascension | 11h 22m 49.58373s [1] |
Declination | +43° 28′ 57.7267″ [1] |
Apparent magnitude (V) | 5.03 [2] |
Characteristics | |
Spectral type | G7IIIBa0.3 [3] |
U−B color index | +0.82 [4] |
B−V color index | +1.02 [4] |
Astrometry | |
Radial velocity (Rv) | 1.01 ± 0.05 [5] km/s |
Proper motion (μ) |
RA: -37.42
[1]
mas/
yr Dec.: -14.26 [1] mas/ yr |
Parallax (π) | 6.12 ± 0.27 mas [1] |
Distance | 530 ± 20
ly (163 ± 7 pc) |
Orbit [6] | |
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 [6] | |
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 |
56 Ursae Majoris (56 UMa) is a star in the constellation Ursa Major. Its apparent magnitude is 5.03. [2] It is a single-lined spectroscopic binary with an orbital period of about 45 years. [5] The companion star is likely a heavy neutron star born by a supernova that exploded around 100,000 years ago. [6]