Theta Volantis
A-type main sequence star in the constellation Volans
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Theta Volantis, Latinized from θ Volantis, is a solitary[9][10] star in the southern constellation of Volans. Based upon parallax measurements, is approximately 240 light years from the Sun. It has an apparent visual magnitude of 5.19,[2] which is bright enough to be faintly visible to the naked eye.
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Volans |
| Right ascension | 08h 39m 05.16145s[1] |
| Declination | −70° 23′ 12.2826″[1] |
| Apparent magnitude (V) | 5.19[2] |
| Characteristics | |
| Spectral type | A0 V[3] |
| U−B color index | −0.03[4] |
| B−V color index | +0.01[4] |
| Astrometry | |
| Radial velocity (Rv) | 13.00±4.2[2] km/s |
| Proper motion (μ) | RA: +19.15[1] mas/yr Dec.: −38.28[1] mas/yr |
| Parallax (π) | 13.58±0.20 mas[1] |
| Distance | 240 ± 4 ly (74 ± 1 pc) |
| Absolute magnitude (MV) | +1.21[5] |
| Details | |
| Mass | 2.3[6] M☉ |
| Luminosity | 37[7] L☉ |
| Surface gravity (log g) | 4.08[6] cgs |
| Temperature | 8,753[7] K |
| Rotational velocity (v sin i) | 98[6] km/s |
| Age | 185−364[6] Myr |
| Other designations | |
| θ Vol, CPD−69°946, FK5 2683, HD 74405, HIP 42425, HR 3460, SAO 256535[8] | |
| Database references | |
| SIMBAD | data |
Theta Volantis is an A-type main sequence star with a stellar classification of A0 V[3] and a mass around 2.3 times that of the Sun. It is a young star with an estimated age of a few hundred million years, and is spinning rapidly with a projected rotational velocity of 98 km/s.[6] Theta Volantis shines 37 times as brightly as the Sun, with an effective temperature of 8,753 K in its outer atmosphere.[7]
The star has two optical companions: a magnitude 15.0 star at an angular separation of 22.10″ along a position angle of 58°, and a magnitude 10.64 star at an angular separation of 41.3″ along a position angle of 105° (both as of 2000).[11]