Theta Gruis
Star in the constellation Grus
From Wikipedia, the free encyclopedia
Theta Gruis, Latinized from θ Gruis, is a triple star[3] system in the southern constellation of Grus. Its combined apparent visual magnitude is 4.28,[2] which is bright enough to be seen with the naked eye. The system contains a magnetic Delta Delphini-like[9] F5 star with a close fainter companion, plus a more distant G2 main sequence star.[3]
Right ascension23h 06m 52.73046s[1]
Declination−43° 31′ 13.2857″[1]
Apparentmagnitude(V)4.28[2] (4.51 + 6.84 + 7.80)[3]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Grus |
| Right ascension | 23h 06m 52.73046s[1] |
| Declination | −43° 31′ 13.2857″[1] |
| Apparent magnitude (V) | 4.28[2] (4.51 + 6.84 + 7.80)[3] |
| Characteristics | |
| Spectral type | kF3VhF5mF5(II-III)[4] + ? + G2V[3] |
| U−B color index | +0.16[2] |
| B−V color index | +0.42[2] |
| Astrometry | |
| Radial velocity (Rv) | +9.6[5] km/s |
| Proper motion (μ) | RA: −47.17[1] mas/yr Dec.: −13.49[1] mas/yr |
| Parallax (π) | 24.73±0.45 mas[1] |
| Distance | 132 ± 2 ly (40.4 ± 0.7 pc) |
| Absolute magnitude (MV) | +1.25[6] |
| Details | |
| θ Gru A | |
| Luminosity | 27[6] L☉ |
| Rotational velocity (v sin i) | 64[7] km/s |
| Other designations | |
| θ Gru, CD−44°15149, HD 218227, HIP 114131, HR 8787, SAO 231444[8] | |
| Database references | |
| SIMBAD | data |
