Beta Serpentis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 46m 11.25435s |
| Declination | +15° 25′ 18.5959″ |
| Apparent magnitude (V) | +3.65 (3.68 + 9.7) |
| Characteristics | |
| Spectral type | A2 V or A2 IV + K3 V |
| U−B color index | +0.09 |
| B−V color index | +0.073 |
| Astrometry | |
| Radial velocity (Rv) | +0.6±0.3 km/s |
| Proper motion (μ) | RA: +65.38 mas/yr Dec.: −38.61 mas/yr |
| Parallax (π) | 21.03±0.26 mas |
| Distance | 155 ± 2 ly (47.6 ± 0.6 pc) |
| Absolute magnitude (MV) | +0.30/+6.59 |
| Details | |
| Mass | 1.828+0.027 −0.03 M☉ |
| Radius | 4.195 (equatorial) 3.07 (polar) R☉ |
| Luminosity | 58.17+2.57 −2.25 L☉ |
| Surface gravity (log g) | 3.27 cgs |
| Temperature | 6,967 (equatorial) 9,359 (polar) K |
| Rotational velocity (v sin i) | 216.6+8.1 −8.7 km/s |
| Age | 610+14 −35 Myr |
| Other designations | |
| Zhou, Chow, β Ser, 28 Serpentis, BD+15°2911, HD 141003, HIP 77233, HR 5867, SAO 101725, ADS 9778, CCDM 15461+1525 | |
| Database references | |
| SIMBAD | data |
Beta Serpentis, Latinized from β Serpentis, also named Zhou, is a binary star system in the constellation Serpens, in its head (Serpens Caput). It is visible to the naked eye with a combined apparent visual magnitude of +3.65. Based upon an annual parallax shift of 21.03 mas as seen from Earth, it is located around 155 light years from the Sun. The system is a member of the Ursa Major Moving Group.