Theta Gruis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Grus |
| Right ascension | 23h 06m 52.73046s |
| Declination | −43° 31′ 13.2857″ |
| Apparent magnitude (V) | 4.28(4.51 + 6.84 + 7.80) |
| Characteristics | |
| Spectral type | kF3VhF5mF5(II-III) + ? + G2V |
| U−B color index | +0.16 |
| B−V color index | +0.42 |
| Astrometry | |
| Radial velocity (Rv) | +9.6 km/s |
| Proper motion (μ) |
RA: −47.17 mas/yr Dec.: −13.49 mas/yr |
| Parallax (π) | 24.73 ± 0.45mas |
| Distance | 132 ± 2 ly (40.4 ± 0.7 pc) |
| Details | |
| θ Gru A | |
| Rotational velocity (v sin i) | 64 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Theta Gruis (θ Gruis) is a triple star system in the southern constellation of Grus. Its combined apparent visual magnitude is 4.28, which is bright enough to be seen with the naked eye. The system contains a magnetic Delta Delphini-like F5 star with a close fainter companion, plus a more distant G2 main sequence star.
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