Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Indus |
Right ascension | 21h 19m 51.98955s[1] |
Declination | −53° 26′ 57.9315″[1] |
Apparent magnitude (V) | 4.40[2] |
Characteristics | |
Spectral type | A5IV-V[3] |
B−V color index | +0.18[2] |
Astrometry | |
Radial velocity (Rv) | −14.50[4] km/s |
Proper motion (μ) | RA: +107.90[1] mas/yr Dec.: −66.41[1] mas/yr |
Parallax (π) | 33.02 ± 0.49 mas[1] |
Distance | 99 ± 1 ly (30.3 ± 0.4 pc) |
Absolute magnitude (MV) | 1.98[5] |
Details | |
Mass | 1.75[6] M☉ |
Radius | 1.61[7] R☉ |
Luminosity | 12.95[8] L☉ |
Temperature | 8,332[6] K |
Rotational velocity (v sin i) | 135[7] km/s |
Age | 150±100[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Theta Indi (θ Ind) is a binary star in the constellation Indus. Its apparent magnitude is 4.40[2] and it is approximately 98.8 light years away based on parallax.[1] The smaller companion, B, has a spectral type of G0V (yellow main-sequence) and an apparent magnitude of 7.18 at a separation of 6.71″.[9] Recent observations suggest the primary is itself a binary with components Aa and Ab orbiting at 0.0617″, estimated period about 1.3 years.[10][11]