Theta Indi
 Location of θ Indi (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Indus |
| Right ascension | 21h 19m 51.98955s |
| Declination | −53° 26′ 57.9315″ |
| Apparent magnitude (V) | 4.40 |
| Characteristics | |
| Spectral type | A5IV-V |
| B−V color index | +0.18 |
| Astrometry | |
| Radial velocity (Rv) | -14.50 km/s |
| Proper motion (μ) |
RA: +107.90 mas/yr Dec.: -66.41 mas/yr |
| Parallax (π) | 33.02 ± 0.49mas |
| Distance | 99 ± 1 ly (30.3 ± 0.4 pc) |
| Absolute magnitude (MV) | 1.98 |
| Details | |
| Mass | 1.75 M☉ |
| Radius | 1.61 R☉ |
| Luminosity | 12.95 L☉ |
| Temperature | 8,332 K |
| Rotational velocity (v sin i) | 135 km/s |
| Age | 150±100 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 and it is approximately 98.8 light years away based on parallax. 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". Recent observations suggest the primary is itself a binary with components Aa and Ab orbiting at 0.0617", estimated period about 1.3 years.
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