| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h14m 50.85024s[1] |
| Declination | +10° 06′ 02.1964″[1] |
| Apparent magnitude (V) | 5.45 (5.51 + 8.53)[2] |
| Characteristics | |
| Spectral type | K1 III[3] |
| B−V color index | 1.007±0.003[4] |
| Astrometry | |
| Radial velocity (Rv) | +16.80±0.40[4] km/s |
| Proper motion (μ) | RA: −20.83[1] mas/yr Dec.: −164.41[1] mas/yr |
| Parallax (π) | 12.31 ± 0.59 mas[1] |
| Distance | 260 ± 10 ly (81 ± 4 pc) |
| Absolute magnitude (MV) | 0.75[4] |
| Details | |
| Mass | 1.48±0.42[5] M☉ |
| Radius | 10[6] R☉ |
| Luminosity | 61.08[4] L☉ |
| Surface gravity (log g) | 2.55±0.11[5] cgs |
| Temperature | 4,845±92[5] K |
| Metallicity [Fe/H] | −0.26[7] dex |
| Rotational velocity (v sin i) | 0.0[6] km/s |
| Age | 2.0+0.8 −0.6[5] Myr |
| Other designations | |
15 Boo, BD+10°2654, FK5 3131, GC 19226, HD 124679, HIP 69612, HR 5330, SAO 100934, CCDM 14148+1006, WDS J14148+1006[8] | |
| Database references | |
| SIMBAD | data |
15 Boötis is a binary star[2] system in the northern constellationofBoötes,[8] located approximately 260 light years away from the Sun.[1] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.45.[2] The system has a relatively high proper motion, traversing the celestial sphere at the rate of 0.166 arc seconds per annum.[9] It is moving away from the Earth with a heliocentric radial velocity of +16.8 km/s.[4]
The magnitude 5.51[2] primary, designated component A, is an aging K-type giant star with a stellar classification of K1 III.[3] It is a red clump giant,[7] which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. It is around two[5] billion years old with 1.5[5] times the mass of the Sun and has expanded to 10[6] times the Sun's radius. The star is radiating 61[4] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,845 K.[5]
Its companion, component B, is a magnitude +8.53 star[2] was located at an angular separationof0.80″ along a position angle of 111° from the primary, as of 2015. This is the same separation it had when the system was discovered in 1936.[10]
