Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Corona Borealis |
Right ascension | 16h 22m 29.21855s[1] |
Declination | +33° 42′ 12.5274″[1] |
Apparent magnitude (V) | +5.396[2] |
Characteristics | |
Spectral type | K5 III[3] |
U−B color index | +1.787[2] |
B−V color index | +1.525[2] |
Astrometry | |
Radial velocity (Rv) | −41.1±0.2[4] km/s |
Proper motion (μ) | RA: −5.42[1] mas/yr Dec.: +50.56[1] mas/yr |
Parallax (π) | 5.49 ± 0.24 mas[1] |
Distance | 590 ± 30 ly (182 ± 8 pc) |
Absolute magnitude (MV) | −0.78[5] |
Details | |
Radius | 50[6] R☉ |
Luminosity | 530[7] L☉ |
Surface gravity (log g) | 1.76[8] cgs |
Temperature | 3,940[8] K |
Metallicity [Fe/H] | −0.16[8] dex |
Rotational velocity (v sin i) | 3.1[9] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Nu2 Coronae Borealis is a solitary,[11] orange-hued star located in the northern constellation of Corona Borealis. It is faintly visible to the naked eye, having an apparent visual magnitude of +5.4.[2] Based upon an annual parallax shift of 5.49 mas,[1] it is located roughly 590 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.1 due to interstellar dust.[12]
This is an evolved red giant star with a stellar classification of K5 III.[3] The measured angular diameter of Nu2 Coronae Borealis is 2.53±0.16 mas.[13] At its estimated distance, this yields a physical size of about 50 times the radius of the Sun.[6] Nu2 Coronae Borealis is radiating 530[7] times the Sun's luminosity from its photosphere at an effective temperature of 3,940 K.[8]