Kappa Andromedae
Kappa Andromedae, Latinized from κ Andromedae, is the Bayer designation for a bright star in the northern constellation of Andromeda. It is visible to the naked eye with an apparent visual magnitude of 4.1. Based on the star's ranking on the Bortle Dark-Sky Scale, it is luminous enough to be visible from the suburbs and from urban outskirts, but not from brightly lit inner city regions. Parallax measurements made during the Hipparcos mission place it at a distance of approximately 168 light-years (52 parsecs) from the Sun. It is drifting closer with a radial velocity of −15 km/s, and there is a high likelihood (86%) that it is a member of the Beta Pictoris moving group. The star has one known companion exoplanet, Kappa Andromedae b.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 23h 40m 24.50763s |
| Declination | +44° 20′ 02.1566″ |
| Apparent magnitude (V) | 4.139 |
| Characteristics | |
| Spectral type | B9 IVn |
| U−B color index | -0.221 |
| B−V color index | -0.067 |
| Astrometry | |
| Radial velocity (Rv) | −15.0 km/s |
| Proper motion (μ) | RA: +80.73 mas/yr Dec.: -18.70 mas/yr |
| Parallax (π) | 19.37 ± 0.19 mas |
| Distance | 168 ± 2 ly (51.6 ± 0.5 pc) |
| Absolute magnitude (MV) | +0.59 |
| Details | |
| Mass | 2.768+0.1 −0.109 M☉ |
| Radius | 2.29±0.06 R☉ |
| Luminosity | 78.5 L☉ |
| Surface gravity (log g) | 4.10±0.03 cgs |
| Temperature | 11,361±66 K |
| Rotational velocity (v sin i) | 176 km/s |
| Age | 47+27 −40 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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