11 Boötis
High proper motion white-hued star in the constellation Boötes
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11 Boötis (HR 5263; HD 122405) is a spectroscopic binary located in the northern constellation Boötes, the herdsman. With an apparent magnitude of 6.22,[3] it is barely visible to the naked eye even under ideal conditions. The system is located relatively close to the Solar System at a distance of 332 light years,[2] and it is drifting closer with a heliocentric radial velocity of −24 km/s.[6] At its current distance, 11 Boötis' brightness is diminished by an interstellar extinction of only 0.03 magnitudes,[12] and it has an absolute visual magnitude of +1.44.[1]
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Boötes[1] |
| Right ascension | 14h 01m 10.48072s[2] |
| Declination | +27° 23′ 11.7452″[2] |
| Apparent magnitude (V) | 6.22±0.01[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | A7V[4] |
| B−V color index | +0.172[5] |
| Astrometry | |
| Radial velocity (Rv) | −24.0±4.3[6] km/s |
| Proper motion (μ) | RA: −78.929 mas/yr[2] Dec.: +18.638 mas/yr[2] |
| Parallax (π) | 9.8333±0.0866 mas[2] |
| Distance | 332 ± 3 ly (101.7 ± 0.9 pc) |
| Absolute magnitude (MV) | +1.44[1] |
| Orbit[7] | |
| Period (P) | 142.54301±0.17515 d |
| Eccentricity (e) | 0.55834±0.01463 |
| Periastron epoch (T) | 2,457,445.023±0.552 JD |
| Argument of periastron (ω) (secondary) | 177.08±1.44° |
| Semi-amplitude (K1) (primary) | 15.252±0.449 km/s |
| Details | |
| Mass | 1.94[8] M☉ |
| Radius | 2.4627+0.0543 −0.0538[2] R☉ |
| Luminosity | 63.63+1.19 −1.11[2] L☉ |
| Surface gravity (log g) | 3.93[8] cgs |
| Temperature | 7,997±272[8] K |
| Metallicity [Fe/H] | −0.02[9] dex |
| Rotational velocity (v sin i) | 123[10] km/s |
| Age | 914[8] Myr |
| Other designations | |
| 11 Boötis, AG+27° 1336, BD+28°2287, FK5 517, GC 18943, HD 122405, HIP 68478, HR 5263, SAO 83130, TIC 28171319[11] | |
| Database references | |
| SIMBAD | data |
The visible component has a stellar classification of A7V,[4] indicating that it is an A-type main-sequence star. It has 1.94 times the mass of the Sun and a slightly enlarged radius of 2.46 R☉. It radiates 63.6 times the luminosity of the Sun[2] from its photosphere at an effective temperature of 7,997 K,[8] giving it a white hue when viewed in the night sky. 11 Boötis is slightly metal deficient with an iron abundance 95.5% that of the Sun,[9] and it spins rapidly with a projected rotational velocity of 123 km/s. It is estimated to be 914 million years old.[8] According to Gaia DR3 models, 11 Boötis is a single-lined spectroscopic binary. Both components take 142.54 days to circle around each other in an eccentric orbit.[7]