6 Serpentis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 21m 01.99609s |
| Declination | +00° 42′ 55.2213″ |
| Apparent magnitude (V) | 5.382 (5.54 + 9.42) |
| Characteristics | |
| Spectral type | K3 III |
| B−V color index | 1.224 |
| Astrometry | |
| Radial velocity (Rv) | +9.7±0.3 km/s |
| Proper motion (μ) | RA: −42.36 mas/yr Dec.: −103.14 mas/yr |
| Parallax (π) | 13.63±0.73 mas |
| Distance | 240 ± 10 ly (73 ± 4 pc) |
| Absolute magnitude (MV) | 1.03 |
| Details | |
| 6 Ser A | |
| Mass | 1.27 M☉ |
| Radius | 12 R☉ |
| Luminosity | 55 L☉ |
| Surface gravity (log g) | 2.4 cgs |
| Temperature | 4,417±17 K |
| Metallicity [Fe/H] | −0.02 dex |
| Rotational velocity (v sin i) | 2.4 km/s |
| Age | 6.03 Gyr |
| Other designations | |
| 6 Ser, BD+01°3067, HD 136514, HIP 75119, HR 5710, SAO 120955, ADS 9596, WDS J15210+0043 | |
| Database references | |
| SIMBAD | data |
6 Serpentis is a binary star system in the constellation Serpens. It has a combined apparent visual magnitude of 5.382, which is bright enough to be faintly visible to the naked eye. The distance to this system, based upon an annual parallax shift of 13.63±0.73 mas, is about 240 light years. It is moving further from the Sun with a heliocentric radial velocity of +10 km/s.
The primary, component A, is an evolved red giant of spectral type K3III, a star that has used up its core hydrogen and has expanded. At the age of around six billion years it is a red clump star, indicating it is on the horizontal branch and is generating energy through helium fusion at its core. The star has 1.27 times the mass of the Sun and has expanded to 12 times the Sun's radius. It is radiating 55 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,417 K.
As of 2005, the magnitude 9.42 secondary, component B, was at an angular separation of 3.329″±0.017″ along a position angle of 21.8°±0.3°.