HD 89571

HD 89571
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Camelopardalis
Right ascension 10h 29m 41.6297s[1]
Declination +84° 15′ 06.949″[1]
Apparent magnitude (V) 5.51±0.01[2]
Characteristics
Spectral type A9 V[3]
U−B color index +0.06[2]
B−V color index +0.23[2]
Astrometry
Radial velocity (Rv)3.5±2[4] km/s
Proper motion (μ) RA: −145.145 mas/yr[1]
Dec.: −21.494 mas/yr[1]
Parallax (π)23.0490 ± 0.3729 mas[1]
Distance142 ± 2 ly
(43.4 ± 0.7 pc)
Absolute magnitude (MV)+2.48[5]
Orbit[6]
PrimaryA
CompanionB
Period (P)2.20±0.03 yr
Semi-major axis (a)0.0142±0.0006″
Eccentricity (e)0.26±0.11
Details
A
Mass1.69[7] M☉
Radius1.79[1] R☉
Luminosity8.4[8] L☉
Surface gravity (log g)4.27[9] cgs
Temperature7,535[10] K
Metallicity [Fe/H]+0.04[11] dex
Rotational velocity (v sin i)134±7[10] km/s
Age710[7] Myr
B
Mass0.38[7] M☉
Other designations
AG+84°229, BD+84°234, GC 14305, HD 89571, HIP 51384, HR 4062, SAO 1701, WDS J10297+8415AB
Database references
SIMBADdata

HD 89571 (HR 4062) is a binary star[12] located in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye with a combined apparent magnitude of 5.51[2] and is estimated to be 142 light years[1] away from the Solar System. However, it is receding with a heliocentric radial velocity of 3.5 km/s.[4]

The primary has a stellar classification of A9 V,[3] indicating that it is an ordinary A-type main-sequence star. David S. Evans gave it a slightly warmer class of A6 V[13] while Cowley et al. classified it as F0 IV,[14] indicating a F-type subgiant. Nevertheless, the two components take roughly 2 years to orbit each other at a mean separation of 14.2 mas.[6]

The components have masses of 1.69 M☉ and 0.38 M☉,[7] with the latter being a probable M-type star. HD 89571 has a radius of 1.79 R☉[1] and a luminosity of 8.4 L☉.[8] This yields an effective temperature of 7,535 K,[10] giving a white hue. It is estimated to be 710 million years old[7] and spins rapidly with a projected rotational velocity of 134 km/s;[10] it has a near solar metallicity, equating to an iron abundance 110% that of the Sun.[11]

  1. ^ a b c d e f g Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Oja1991 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Abt1995 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Evans1967 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Malkov2012 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference DeRosa2013 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Chanlder2016 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference A.P1999 was invoked but never defined (see the help page).
  10. ^ a b c d Cite error: The named reference Reiners2006 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Netopil2017 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Evans1966 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).