Sigma2 Gruis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Grus |
| Right ascension | 22h 36m 58.85405s |
| Declination | −40° 35′ 27.7272″ |
| Apparent magnitude (V) | 5.86 (5.91 + 10.04) |
| Characteristics | |
| Spectral type | A1 V |
| U−B color index | +0.06 |
| B−V color index | +0.06 |
| Astrometry | |
| Radial velocity (Rv) | +15.0±2.9 km/s |
| Proper motion (μ) | RA: +44.56 mas/yr Dec.: −70.07 mas/yr |
| Parallax (π) | 15.19±0.53 mas |
| Distance | 215 ± 7 ly (66 ± 2 pc) |
| Absolute magnitude (MV) | +1.76 |
| Details | |
| σ2 Gru A | |
| Mass | 2.15 M☉ |
| Luminosity | 17.5 L☉ |
| Surface gravity (log g) | 4.36±0.14 cgs |
| Temperature | 9,549±325 K |
| Rotational velocity (v sin i) | 80.9±0.7 km/s |
| Age | 255 Myr |
| Other designations | |
| σ2 Gru, CD−41°14963, HD 214150, HIP 111643, HR 8602, SAO 231217, WDS J22370-4035 | |
| Database references | |
| SIMBAD | data |
Sigma2 Gruis is a binary star system in the southern constellation of Grus. Its apparent visual magnitude is 5.86. The pair had an angular separation of 2.7 arc seconds along a position angle of 265°, as of 1991. Located around 215 ly (66 pc) distant, the white-hued primary component is an A-type main-sequence star of spectral type A1V, a star that is currently fusing its core hydrogen.