Nu2 Arae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ara |
| Right ascension | 17h 51m 11.045s |
| Declination | −53° 07′ 48.97″ |
| Apparent magnitude (V) | 6.10 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | B9.5 III-IV |
| B−V color index | +0.010±0.004 |
| Astrometry | |
| Radial velocity (Rv) | +18.8±1.2 km/s |
| Proper motion (μ) | RA: +14.823 mas/yr Dec.: +0.415 mas/yr |
| Parallax (π) | 5.7871±0.0418 mas |
| Distance | 564 ± 4 ly (173 ± 1 pc) |
| Absolute magnitude (MV) | +0.14 |
| Details | |
| Mass | 2.4±0.3 M☉ |
| Radius | 3.9±0.1 R☉ |
| Luminosity | 117±9 L☉ |
| Surface gravity (log g) | 3.64±0.06 cgs |
| Temperature | 9,586±194 K |
| Other designations | |
| ν2 Arae, CD−53°7430, GC 24208, HD 161917, HIP 87379, HR 6632, SAO 245072, PPM 346364, TIC 397039557 | |
| Database references | |
| SIMBAD | data |
Nu2 Arae is a star in the southern constellation of Ara. Its name is a Bayer designation that is Latinized from ν2 Arae, and abbreviated Nu2 Ara or ν2 Ara. This star is faintly visible to the naked eye with an apparent visual magnitude of 6.10. Based on parallax measurements, it is located at a distance of approximately 564 light-years (173 parsecs) from the Earth. It is drifting further away from the Sun with a radial velocity of +19 km/s.
The stellar classification of B9.5 III-IV shows this to be a B-type star with a spectrum that displays features of both the subgiant and giant star stages. Stellar models predict this is a main sequence (dwarf) star with 2.4 times the mass of the Sun and 3.9 times the Sun's radius. It is radiating 117 times the luminosity of the Sun from its photosphere at an effective temperature of 9,586 K.
The star is sometimes referred as Upsilon2 Arae (υ2 Arae).