Gamma Boötis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 32m 04.672s |
| Declination | +38° 18′ 29.69″ |
| Apparent magnitude (V) | +3.03 +3.02 to +3.07 |
| Characteristics | |
| Spectral type | A7 IV+(n) or A7 III |
| U−B color index | +0.120 |
| B−V color index | +0.191 |
| Variable type | δ Sct |
| Astrometry | |
| Radial velocity (Rv) | −32.40±1.0 km/s |
| Proper motion (μ) | RA: −114.344 mas/yr Dec.: +151.788 mas/yr |
| Parallax (π) | 37.9125±0.2550 mas |
| Distance | 86.0 ± 0.6 ly (26.4 ± 0.2 pc) |
| Absolute magnitude (MV) | +0.93 |
| Details | |
| Aa | |
| Mass | 2.10 M☉ |
| Radius | 4.03±0.04 R☉ |
| Luminosity | 33.4 L☉ |
| Surface gravity (log g) | 3.75±0.05 cgs |
| Temperature | 7,800 K |
| Metallicity [Fe/H] | −0.08 dex |
| Rotational velocity (v sin i) | 121 km/s |
| Age | 0.9 or 1.0 Gyr |
| Other designations | |
| Seginus, Haris, Ceginus, Segin, Gamma Boo, 27 Boötis, BD+38°2565, FK5 535, GC 19607, HD 127762, HIP 71075, HR 5435, SAO 64203, PPM 77976, WDS J14321+3818A, BU 616 | |
| Database references | |
| SIMBAD | data |
Gamma Boötis is a binary star system in the northern constellation of Boötes the herdsman, forming the left shoulder of this asterism. Its name is a Bayer designation that is Latinised from γ Boötis, and abbreviated Gamma Boo or γ Boo. The primary component has the proper name Seginus, pronounced /sɪˈdʒaɪnəs/, the traditional name of the Gamma Bootis system. It has a white hue and is visible to the naked eye with a typical apparent visual magnitude of +3.03. Based on parallax measurements, it is located at a distance of 86 light-years, but is drifting closer to the Sun with a radial velocity of −32 km/s.