Kappa Pegasi

Kappa Pegasi

Observation data Epoch J2000      Equinox J2000
Constellation	Pegasus
Right ascension	21h 44m 38.7344s
Declination	+25° 38′ 42.128″
Apparent magnitude (V)	4.159
Characteristics
Spectral type	F5IV
U−B color index	+0.03
B−V color index	+0.44
Astrometry
Radial velocity (Rv)	−8.1 km/s
Proper motion (μ)	RA: 46.66 mas/yr Dec.: 13.47 mas/yr
Parallax (π)	28.34 ± 0.88 mas
Distance	115 ± 4 ly (35 ± 1 pc)
Details
Mass	1.55/1.66/0.81 M☉
Surface gravity (log g)	3.00 cgs
Temperature	6,579 K
Metallicity	$\begin{smallmatrix}\left[\frac{Fe}{H}\right]\ =\ -0.37\end{smallmatrix}$
Rotational velocity (v sin i)	35 km/s
Other designations
HR 8315, BD+24 4463, HD 206901, SAO 89949, HIP 107354.

Kappa Pegasi is a triple star system in the constellation Pegasus. It has an apparent brightness of +4.13 magnitude and belongs to the spectral class F5IV; a subgiant star.

This system consists of two components, designated Kappa Pegasi A and B, that are separated by an angular distance of 0.235 arcseconds. The binary nature of this pair was discovered by Sherburne W. Burnham in 1880. They orbit around each other every 11.6 years with a semimajor axis of 0.4 arcseconds. The brighter member of the pair, Kappa Pegasi B, is actually a spectroscopic binary, with the components designated Kappa Pegasi Ba and Kappa Pegasi Bb. They orbit about each other every six days. There is a fourth component, Kappa Pegasi C, which may be an optical companion.