HD 21447

HD 21447
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
Right ascension 03h 30m 00.18302s[1]
Declination +55° 27′ 06.5158″[1]
Apparent magnitude (V) 5.09[2]
Characteristics
Spectral type A1 Va[3]
B−V color index 0.022±0.015[2]
Astrometry
Radial velocity (Rv)−1.9±0.9[4] km/s
Proper motion (μ) RA: −46.08[1] mas/yr
Dec.: −11.07[1] mas/yr
Parallax (π)16.42 ± 0.29 mas[1]
Distance199 ± 4 ly
(61 ± 1 pc)
Absolute magnitude (MV)1.17[2]
Details
Mass2.32[5] M☉
Radius1.9[6] R☉
Luminosity32.16[2] L☉
Surface gravity (log g)4.06[7] cgs
Temperature10,049±342[7] K
Rotational velocity (v sin i)182[7] km/s
Age146[7] Myr
Other designations
NSV 1159, BD+54°684, HD 21447, HIP 16292, HR 1046, SAO 24064, WDS J03300+5527A[8]
Database references
SIMBADdata

HD 21447 is a probable binary star[9] system located in the constellation Camelopardalis. The star is also known as HR 1046. It can be viewed with the naked eye, having an apparent visual magnitude of 5.09.[2] Based upon an annual parallax shift of 16.42±0.29 mas,[1] it is located some 199 light years from the Sun. It is a candidate for membership in the Ursa Major Moving Group.[10]

The primary component is A-type main-sequence star with a stellar classification of A1 Va.[3] It is around 146[7] million years old and is spinning with a projected rotational velocity of 182 km/s.[7] The star has an estimated 2.32[5] times the mass of the Sun and about 1.9[6] times the Sun's radius. It is radiating around 32[2] times the Sun's luminosity from its photosphere at an effective temperature of 10,049 K.[7] The companion is visual magnitude 9.4 star at an angular separation of 14.8″.[9]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gray1987 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference DeRosa2014 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference PasinettiFracassini2001 was invoked but never defined (see the help page).
  7. ^ a b c d e f g Cite error: The named reference David2015 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference king2003 was invoked but never defined (see the help page).