HD 125351
Spectroscopic star system in the constellation Boötes
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HD 125351 or A Boötis (A Boo) is multiple star system in the constellation Boötes. The system has an apparent magnitude of +4.97, with a spectrum matching a K-type giant star. It is approximately 233 light-years from Earth.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes[1] |
| Right ascension | 14h 17m 59.81955s[2] |
| Declination | +35° 30′ 34.2208″[2] |
| Apparent magnitude (V) | 4.9660±0.0007[3] |
| Characteristics | |
| Evolutionary stage | red giant branch[4] |
| Spectral type | K1III[5] |
| Astrometry | |
| Radial velocity (Rv) | −21.6±0.3[3] km/s |
| Proper motion (μ) | RA: 4.87[2] mas/yr Dec.: 14.40[2] mas/yr |
| Parallax (π) | 13.97±0.39 mas[2] |
| Distance | 233 ± 7 ly (72 ± 2 pc) |
| Absolute magnitude (MV) | +0.53[1] |
| Orbit[6] | |
| Primary | A Boötis Aa1 |
| Name | A Boötis Aa2 |
| Period (P) | 212.085 days |
| Semi-major axis (a) | 2.3 mas |
| Eccentricity (e) | 0.570 |
| Inclination (i) | 83.5° |
| Longitude of the node (Ω) | 195.2° |
| Periastron epoch (T) | 2,440,286.002 |
| Argument of periastron (ω) (secondary) | 224.9° |
| Details | |
| Aa1 | |
| Mass | 3.0[7] M☉ |
| Radius | 13[4] R☉ |
| Luminosity | 75[4] L☉ |
| Surface gravity (log g) | 2.25[8] cgs |
| Temperature | 4,650[8] K |
| Metallicity [Fe/H] | −0.03[8] dex |
| Aa2 | |
| Mass | 1.2[7] M☉ |
| Ab | |
| Mass | 1.85[7] M☉ |
| Other designations | |
| A Boötis, BD+36°2468, HD 125351, HIP 69879, HR 5361, SAO 64053 | |
| Database references | |
| SIMBAD | data |
HD 125351 is an astrometric and single-lined spectroscopic binary with a known 212-day orbit.[9] Speckle interferometry has detected a companion at a separation of 0.09″, which is likely to be a different star from the unseen spectroscopic companion. It is 1.45 magnitudes fainter than the visible primary in the near infrared. An orbital period of seven years is suggested. This would make HD 125351 a triple system. Further faint stars at separations of 14″ and 96″ share a common proper motion although any orbits would take many thousands of years.[7]