HD 125351

"A Boötis" redirects here; not to be confused with α Boötis.

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.

HD 125351

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
Companion	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]