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HD 49268

HD 49268
Observation data
Epoch J2000      Equinox J2000
Constellation Volans
Right ascension 06h 40m 57.6024s[1]
Declination −71° 46′ 30.6872″[1]
Apparent magnitude (V) 6.49±0.01[2]
Characteristics
Spectral type K1 III CNII[3]
U−B color index +1.06[4]
B−V color index +1.11[4]
Astrometry
Radial velocity (Rv)20.6±0.4[5] km/s
Proper motion (μ) RA: +21.453 mas/yr[1]
Dec.: −40.165 mas/yr[1]
Parallax (π)7.1467 ± 0.0222 mas[1]
Distance456 ± 1 ly
(139.9 ± 0.4 pc)
Absolute magnitude (MV)+0.89[6]
Details
Mass1.36[7] M☉
Radius10.77[8] R☉
Luminosity60.2+2.8
−2.7[9] L☉
Surface gravity (log g)2.48[7] cgs
Temperature4,660±90[9] K
Metallicity [Fe/H]+0.07[10] dex
Rotational velocity (v sin i)<1.6[11] km/s
Other designations
2 G. Volantis, CD−71°357, CPD−71°476, HD 49268, HIP 31977, HR 2505, SAO 256326, WDS J06410-7147A[12][13]
Database references
SIMBADdata

HD 49268 (HR 2505) is a solitary star in the southern circumpolar constellation Volans. It has an apparent magnitude of +6.49,[2] placing it near the limit of naked eye visibility. Parallax measurements place the object at a distance of 456 light years;[1] it is receding with a heliocentric radial velocity of 20.6 km/s.[5]

The stellar classification of HD 49268 is K1 III CNII,[3] indicating that it is an ageing red giant with a strong over-abundance of cyano radical in its stellar atmosphere. It has 136% the mass of the Sun[7] but expanded to 10.77 times its girth.[8] It is radiating 60 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,660 K,[9] giving it an orange hue. HD 49268 is slightly metal enriched with an iron abundance 117% that of the Sun and is believed to be a member of the thick disk population.[10] It spins leisurely with a projected rotational velocity that is lower than 1.6 km/s.[11]

HD 49268 has two faint companions listed in the Washington Double Star Catalogue: a tenth magnitude star 17″ away; and a 13th magnitude star 65″ away. Both are unrelated background stars.[14]

  1. ^ a b c d e Cite error: The named reference EDR3 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 Houk1975 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Johnson1966 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. ^ 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 c Cite error: The named reference Charbonnel2020 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Eggen1993 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference DeMederios2014 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD 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 Mason2001 was invoked but never defined (see the help page).
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