Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
Right ascension | 23h 27m 07.40s [1] |
Declination | +42° 54′ 43.2″ [1] |
Apparent magnitude (V) | 5.75 [2] |
Characteristics | |
Spectral type | B9 III or B9 Mn [3] |
B−V color index | −0.007±0.004 [2] |
Variable type | α2 CVn [4] |
Astrometry | |
Radial velocity (Rv) | −8.1±1.6 [5] km/s |
Proper motion (μ) | RA: 87.05 [1] mas/yr Dec.: 16.54 [1] mas/yr |
Parallax (π) | 10.87±0.30 mas [1] |
Distance | 300 ± 8 ly (92 ± 3 pc) |
Absolute magnitude (MV) | 0.98 [6] |
Details | |
Luminosity | 42.89 [2] L☉ |
Rotational velocity (v sin i) | 75 [7] km/s |
Age | 345 [6] Myr |
Other designations | |
13 And, V388 Andromedae, BD+42°4672, HD 220885, HIP 115755, HR 8913, SAO 53039, PPM 64250 [8] | |
Database references | |
SIMBAD | data |
13 Andromedae, abbreviated 13 And, is a single, [10] blue-white hued variable star [4] in the northern constellation of Andromeda. 13 Andromedae is the Flamsteed designation, while it bears the variable star designation V388 Andromedae. With a typical apparent visual magnitude of around 5.75, [2] it is dimly visible to the naked eye under good seeing conditions. The distance to this star can be directly estimated from its annual parallax shift of 10.9 mas , [1] yielding a range of 300 light years. At that distance, its brightness is diminished by an extinction of 0.13 magnitude due to interstellar dust. [6] The star is moving closer to the Earth with a heliocentric radial velocity of −8 km/s. [5]
The variability of 13 Andromedae was first detected in Hipparcos satellite data, and it received its variable star designation in 1999. [11] [12]
This is a magnetic chemically peculiar star that has been assigned stellar classifications of B9 III or B9 Mn. [3] It is a variable star of the Alpha2 Canum Venaticorum type, ranging in magnitude from 5.73 down to 5.77 [4] with a period of 1.47946 days. [3] The star has a high rate of spin, showing a projected rotational velocity of 75 km/s. [7] 13 Andromedae is around 345 [6] million years old and shines with 43 [2] times the Sun's luminosity.