Nu1 Coronae Borealis is a solitary,[7] red-hued star located in the northern constellation of Corona Borealis. It is faintly visible to the naked eye, having an apparent visual magnitude of 5.20.[2] Based upon an annual parallax shift of 5.0 mas,[8] it is located roughly 650 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.1 due to interstellar dust.[9] This object is drifting closer with a radial velocity of −13 km/s.[4]
ν1 Coronae Borealis (upper red star) in optical light | |
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
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Constellation | Corona Borealis |
Right ascension | 16h 22m 21.42545s[1] |
Declination | +33° 47′ 56.5825″[1] |
Apparent magnitude (V) | 5.20[2] |
Characteristics | |
Spectral type | M2 III[3] |
B−V color index | 1.64[3] |
Astrometry | |
Radial velocity (Rv) | −13.17±0.35[4] km/s |
Proper motion (μ) | RA: +4.265[1] mas/yr Dec.: −37.877[1] mas/yr |
Parallax (π) | 5.0069 ± 0.1323 mas[1] |
Distance | 650 ± 20 ly (200 ± 5 pc) |
Absolute magnitude (MV) | −1.19[3] |
Details | |
Radius | 67.1±7.1[5] R☉ |
Luminosity | 975±30[1] L☉ |
Temperature | 3,936+565 −295[1] K |
Other designations | |
Database references | |
SIMBAD | data |
This is an evolved red giant star with a stellar classification of M2 III.[3] It is a variable star of uncertain type, showing a change in brightness with an amplitude of 0.0114 magnitude and a frequency of 0.22675 cycles per day, or 4.41 days/cycle.[10] It has about 67[5] times the Sun's radius and is radiating 975 times the Sun's luminosity from its photosphere at an effective temperature of 3,936 K.[1]
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