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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]
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 | |
Database references | |
SIMBAD | data |
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