HD 47500

HD 47500
Observation data
Epoch J2000      Equinox J2000
Constellation Columba
A
Right ascension 06h 37m 13.84s[1]
Declination −36° 59′ 26.37″[1]
Apparent magnitude (V) 5.91±0.01[1]
B
Right ascension 06h 37m 13.84s[1]
Declination −36° 59′ 25.91″[1]
Apparent magnitude (V) 7.51±0.01[1]
Characteristics
A
Evolutionary stage main sequence[2]
Spectral type B6 IV-V[3]
U−B color index −0.52[4]
B−V color index −0.12[4]
Astrometry
Radial velocity (Rv)21±4[5] km/s
Proper motion (μ) RA: −9.053 mas/yr[6]
Dec.: +11.625 mas/yr[6]
Parallax (π)2.9218 ± 0.2076 mas[6]
Distance1,120 ± 80 ly
(340 ± 20 pc)
Absolute magnitude (MV)−1.93[7]
Details
A
Mass5.01±0.05[8] M☉
Radius7.33[9] R☉
Luminosity1,482+665
−459[2] L☉
Surface gravity (log g)3.61[10] cgs
Temperature14,703±290[11] K
Metallicity [Fe/H]−0.07[10] dex
Rotational velocity (v sin i)36[12] km/s
Age34±1[2] Myr
Other designations
112 G. Columbae[13], CD−36°3031, CPD−36°1014, GC 8658, HD 47500, HIP 31637, HR 2446, SAO 197014, WDS J06372-3659AB[14]
Database references
SIMBADThe system
A
B

HD 47500, also known as HR 2446, is a binary star[15] in the southern constellation Columba. The primary has an apparent magnitude of 5.91,[1] making it faintly visible to the naked eye if viewed under ideal conditions. As for the companion, its visual magnitude is 7.51.[1] The system is located relatively far at a distance of 1,120 light years based on parallax measurements,[6] and is receding with a heliocentric radial velocity of 21 km/s.[5]

The binary nature of this system was first discovered by Richard Alfred Rossiter in 1942.[16] Their current separation is half of an arcsecond, making it difficult to measure the components properties. Nevertheless, the secondary component is located along a position angle of 4° as of 1999.[17]

HD 47500 has a stellar classification of B6 IV-V,[3] a B-type star with a luminosity class intermediate between a subgiant and main sequence star. Hube (1970) gave the primary a slightly cooler class of B7 III,[18] indicating that it is already a giant star, while Houk (1982) gave it a class of B5/7 IV,[19] intermediate between a B5 and B7 subgiant. Nevertheless, it is estimated to be 34 million years old, having completed 98.5% of its main sequence lifetime.[2] HD 47500 A has 5.01 times the mass of the Sun[8] and an enlarged radius of 7.33 R☉.[9] It radiates 1,482 times the luminosity of the Sun.[2] from its photosphere at an effective temperature of 14,703 K,[11] giving it a bluish-white hue. Unlike most hot stars, the object spins modestly with a projected rotational velocity of 36 km/s.[12]

  1. ^ a b c d e f g h Cite error: The named reference Fabricius2002 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Oblak1981 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Deustchman1976 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Kharchenko2007 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference XHIP was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Hohle2010 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Pauzen2005 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Levato2004 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 Eggleton2008 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Rossiter1943 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Hube1970 was invoked but never defined (see the help page).
  19. ^ Cite error: The named reference Houk1982 was invoked but never defined (see the help page).