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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Corona Borealis |
| Right ascension | 16h22m 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 | |
ν2 Coronae Borealis, 21 CrB, BD+34 2774, HD 147767, HIP 80214, HR 6108, SAO 65259[10] | |
| Database references | |
| SIMBAD | data |
Nu2 Coronae Borealis is a solitary,[11] orange-hued star located in the northern constellationofCorona 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]
{{cite web}}: CS1 maint: postscript (link)
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