Kappa Andromedae
 Location of κ Andromedae (circled) |
|
| 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 ± 0.19mas |
| Distance | 168 ± 2 ly (51.6 ± 0.5 pc) |
| Details | |
| Mass |
2.8+0.1 −0.2 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 | 220 ± 100 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Kappa Andromedae (κ And, κ Andromedae) is the Bayer designation for a bright star in the constellation of Andromeda. Its apparent visual magnitude is 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 Earth.
Kappa Andromedae has a stellar classification of B9 IVn, indicating that it is a subgiant star in the process of evolving away from the main sequence. It has 2.3 times the radius of the Sun and is spinning rapidly, with a projected rotational velocity of 176 km/s. The outer envelope of the star is radiating energy into space with an effective temperature of 11,361 K, producing a blue-white hue.
In Chinese, 螣蛇 (Téng Shé), meaning Flying Serpent, refers to an asterism consisting of κ Andromedae, α Lacertae, 4 Lacertae, π2 Cygni, π1 Cygni, HD 206267, ε Cephei, β Lacertae, σ Cassiopeiae, ρ Cassiopeiae, τ Cassiopeiae, AR Cassiopeiae, 9 Lacertae, 3 Andromedae, 7 Andromedae, 8 Andromedae, λ Andromedae, ι Andromedae, and ψ Andromedae. Consequently, κ Andromedae itself is known as 螣蛇二十一 (Téng Shé èrshíyī, English: the Twenty First Star of Flying Serpent).
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