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Star in the constellation Corona Borealis From Wikipedia, the free encyclopedia
Upsilon Coronae Borealis, Latinized from υ Coronae Borealis, is a solitary[10] star in the northern constellation of Corona Borealis. It is a white-hued star that is dimly visible to the naked eye with an apparent visual magnitude of 5.78.[2] The distance to this object is approximately 630 light-years (190 parsecs) based on parallax.[1]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Corona Borealis |
Right ascension | 16h 16m 44.78733s[1] |
Declination | +29° 09′ 00.9399″[1] |
Apparent magnitude (V) | 5.78[2] |
Characteristics | |
Spectral type | A3V[3] |
U−B color index | +0.10[2] |
B−V color index | +0.07[2] |
Astrometry | |
Radial velocity (Rv) | 0.8±1.0[4] km/s |
Proper motion (μ) | RA: +23.474[1] mas/yr Dec.: −16.644[1] mas/yr |
Parallax (π) | 5.1783 ± 0.0777 mas[1] |
Distance | 630 ± 9 ly (193 ± 3 pc) |
Absolute magnitude (MV) | −0.72[5] |
Details | |
Mass | 3.06±0.19[6] M☉ |
Radius | 1.5[7] R☉ |
Luminosity | 151[8] L☉ |
Temperature | 8,098[8] K |
Rotational velocity (v sin i) | 112[3] km/s |
Other designations | |
Database references | |
SIMBAD | data |
This is an A-type main-sequence star with a stellar classification of A3V;[3] a star that is currently fusing its core hydrogen. However, Palmer et al. (1968) had it classed as type A2IV,[11] and thus it may be near or past its main sequence lifetime.[6] It is a suspected variable star of unknown type that has been measured ranging in brightness from magnitude 5.78 down to 5.88.[12]
Upsilon Coronae Borealis has three[6] times the mass of the Sun and about 1.5[7] times the Sun's radius. It is spinning with a projected rotational velocity of 112 km/s.[3] The star is radiating 151[8] times the luminosity of the Sun from its photosphere at an effective temperature of 8,098 K.[8]
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