HD 46509

HD 46509
Location of HD 46509 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Camelopardalis
Right ascension 06h 40m 32.25255s[1]
Declination +71° 44′ 55.6296″[1]
Apparent magnitude (V) 5.86±0.01[2]
Characteristics
Spectral type G9 III[3] or K0 III[4]
B−V color index +1.19[5]
Astrometry
Radial velocity (Rv)−24.02±0.19[6] km/s
Proper motion (μ) RA: +4.653 mas/yr[1]
Dec.: +11.103 mas/yr[1]
Parallax (π)4.1248 ± 0.0376 mas[1]
Distance791 ± 7 ly
(242 ± 2 pc)
Absolute magnitude (MV)−0.98[7]
Details
Mass5.64±1.82[8] M☉
Radius27.3±0.6[1] R☉
Luminosity399±7[1] L☉
Surface gravity (log g)2.34±0.11[8] cgs
Temperature4,675±92[8] K
Metallicity [Fe/H]+0.12±0.05[8] dex
Rotational velocity (v sin i)1.5±1.2[9] km/s
Age339+78
−63[8] Myr
Other designations
AG+71°216, BD+71°359, FK5 2511, GC 8630, HD 46509, HIP 31946, HR 2396, SAO 5925[10]
Database references
SIMBADdata

HD 46509, also designated as HR 2396, is a solitary star located in the northern circumpolar constellation Camelopardalis, the giraffe. It is faintly visible to the naked eye as a yellowish-orange hued point of light with an apparent magnitude of 5.86.[2] The object is located relatively far at a distance of 791 light-years based on Gaia DR3 parallax measurements,[1] but it is drifting closer with a heliocentric radial velocity of −24.02 km/s.[6] At its current distance, HD 46509's brightness is diminished by interstellar extinction of 0.31 magnitudes and it has an absolute magnitude of −0.98.[7]

HD 46509 has a stellar classification of either G9 III or K0 III,[3][4] with both classes indicating that it is an evolved red giant. It is estimated to be 339 million years old,[8] enough time for it to cool and expand to 27.3 times the radius of the Sun.[1] HD 46509 has about 5.6 times the mass of the Sun[8] and it radiates 399 times the luminosity of the Sun[1] from its enlarged photosphere at an effective temperature of 4,675 K.[8] It is metal enriched with an iron abundance 132% that of the Sun's ([Fe/H] = +0.12)[8] and like most giant stars, it spins slowly with a projected rotational velocity of approximately 1.5 km/s.[9]

  1. ^ a b c d e f g h i 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 Wilson1950 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Halliday1955 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Haggkvist1970 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c d e f g h i Cite error: The named reference Feuillet2016 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference deMed1999 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).