HD 21699

HD 21699
Location of HD 21699 (circled)
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]
Distance580 ± 20 ly
(177 ± 5 pc)
Absolute magnitude (MV)−0.982[5]
Details
Mass6.46[5] M☉
Radius3.55[5] R☉
Luminosity708[5] L☉
Surface gravity (log g)4.15[5] cgs
Temperature16,000[5] K
Metallicity [Fe/H]+0.92[6] dex
Rotation2.49246±0.00035 d[7]
Rotational velocity (v sin i)35[8] km/s
Age12±6[9] Myr
Other designations
V396 Per, HR 1063, HIP 16470, SAO 38917[10]
Database references
SIMBADdata

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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  2. ^ a b c Cite error: The named reference gcvs was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Morgan1971 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  5. ^ a b c d e f Cite error: The named reference Glagolevskij2006 was invoked but never defined (see the help page).
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  7. ^ Cite error: The named reference Percy1985 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference ferrero2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Wolff1990 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Glagolevskij2007 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Molnar1978 was invoked but never defined (see the help page).