HD 39901

HD 39901
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension 05h 53m 22.85088s[1]
Declination −42° 55′ 16.7853″[1]
Apparent magnitude (V) 6.54±0.01[2]
Characteristics
Spectral type K3 III[3]
B−V color index +1.37[4]
Astrometry
Radial velocity (Rv)−10.3±0.4[5] km/s
Proper motion (μ) RA: +5.109 mas/yr[1]
Dec.: +11.405 mas/yr[1]
Parallax (π)5.1076 ± 0.0152 mas[1]
Distance639 ± 2 ly
(195.8 ± 0.6 pc)
Absolute magnitude (MV)−0.03[6]
Details
Mass1.27[7] M☉
Radius21.9[8] R☉
Luminosity143±1[9] L☉
Surface gravity (log g)1.87[7] cgs
Temperature4,373±122[10] K
Metallicity [Fe/H]+0.08[11] dex
Rotational velocity (v sin i)<1.6[12] km/s
Other designations
59 G. Columbae[13], CD−42°2205, CPD−42°769, GC 7431, HD 39901, HIP 27835, HR 2069, SAO 217599[14]
Database references
SIMBADdata

HD 39901 is an orange hued star located in the constellation Columba. It is also called HR 2069, which is the star's Bright Star Catalog designation. Eggen (1989) lists it as a member of the old disk population.[11]

Despite the HR designation, the object has an apparent magnitude of 6.54,[2] slightly past the limit for the naked eye visibility. As a result, it is barely visible to the unaided eye in the best conditions. Parallax measurements from the Gaia spacecraft place the object 639 light years away.[1] It is approaching the Solar System with a heliocentric radial velocity of −10.3 km/s.[5] At that distance, HD 39901's brightness is diminished by 0.33 magnitudes due to interstellar dust.[15] It has an absolute magnitude of −0.03.[6]

This is an evolved red giant star with a stellar classification of K3 III.[3] It has a comparable mass to the Sun[7] but has expanded to 21.9 times the latter's girth.[8] It radiates 143 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 4,373 K.[10] HD 39901 is slightly enriched in heavy elements with a metallicity 120% that of the Sun's.[11] Like most giants, it spins slowly, having a projected rotational velocity lower than 1.6 km/s.[12]

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Corben1971 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Anders2022 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference Eggen1989 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference DeMed2014 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).