| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 35m 33.230s[1] |
| Declination | +17° 39′ 20.00″[1] |
| Apparent magnitude (V) | 6.10[2] |
| Characteristics | |
| Spectral type | G8III:[3] |
| B−V color index | +0.975±0.006[2] |
| Astrometry | |
| Radial velocity (Rv) | −22.3±2.9[4] km/s |
| Proper motion (μ) | RA: −77.745 mas/yr[1] Dec.: −13.437 mas/yr[1] |
| Parallax (π) | 9.1014 ± 0.0329 mas[1] |
| Distance | 358 ± 1 ly (109.9 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.78[2] |
| Details | |
| Luminosity | 50[5] L☉ |
| Temperature | 4,983[5] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Tau3 Serpentis, Latinized from τ3 Serpentis, is a giant star in the constellation of Serpens. It has an apparent visual magnitude of approximately 6.11,[2] which is bright enough to be dimly visible to the naked eye under favorable viewing conditions. The distance to this star is approximately 358 light years based on parallax measurements, but it is drifting closer with a heliocentric radial velocity of −22 km/s.[7]
The stellar classification of this star is G8III:,[3] which matches a G-type giant star. However, the trailing colon ':' indicates some uncertainty in the classification. It is radiating 50 times the luminosity of the Sun from its photosphere at an effective temperature of 4,983 K.[5]
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