Global InformationHD 21699 information
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 03h 32m 08.60842s[1] |
| Declination | +48° 01′ 24.5285″[1] |
| Apparent magnitude (V) | 5.45 - 5.53[2] |
| Characteristics | |
| Spectral type | B8 III[3] |
| U−B color index | −0.61[3] |
| B−V color index | −0.17[3] |
| Variable type | SX Arietis[2] |
| Astrometry | |
| Radial velocity (Rv) | 2.6±0.9[4] km/s |
| Proper motion (μ) | RA: 18.314±0.149[1] mas/yr Dec.: −28.723±0.144[1] mas/yr |
| Parallax (π) | 5.6378 ± 0.1539 mas[1] |
| Distance | 580 ± 20 ly (177 ± 5 pc) |
| Absolute magnitude (MV) | −0.982[5] |
| Details | |
| Mass | 6.46[5] M☉ |
| Radius | 3.55[5] R☉ |
| Luminosity | 708[5] L☉ |
| Surface gravity (log g) | 4.15[5] cgs |
| Temperature | 16,000[5] K |
| Metallicity [Fe/H] | +0.92[6] dex |
| Rotation | 2.49246±0.00035 d[7] |
| Rotational velocity (v sin i) | 35[8] km/s |
| Age | 12±6[9] Myr |
| Other designations | |
V396 Per, HR 1063, HIP 16470, SAO 38917[10] | |
| Database references | |
| SIMBAD | data |
HD 21699, also known as HR 1063 and V396 Persei, is a star about 580 light years from the Earth, in the constellation Perseus.[1] It is a 5th magnitude star, so it will be faintly visible to the naked eye of an observer far from city lights. This is a variable star, whose brightness varies slightly from 5.45 to 5.53 during its 2.4761 day rotation period.[2] It has a remarkable dipole magnetic field which is displaced from the star's center by 0.4 stellar radii, the poles of which appear close to each other on the stellar surface.[11] HD 21699 is a member of the Alpha Persei Cluster.[12]
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