HD 34255

HD 34255
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Camelopardalis
Right ascension 05h 20m 22.61066s[1]
Declination +62° 39′ 13.3608″[1]
Apparent magnitude (V) 5.60±0.01[2]
Characteristics
Spectral type K4 I[3]
U−B color index +2.00[4]
B−V color index +1.75[4]
Astrometry
Radial velocity (Rv)−7.7±0.15[5] km/s
Proper motion (μ) RA: −3.105 mas/yr[1]
Dec.: −2.373 mas/yr[1]
Parallax (π)1.9726 ± 0.0788 mas[1]
Distance1,650 ± 70 ly
(510 ± 20 pc)
Absolute bolometric
magnitude (Mbol)		−4.40±0.24[6]
Details
Mass6.9±0.9[7] M☉
Radius145[6] R☉
Luminosity6,101[8] L☉
Surface gravity (log g)1.14[9] cgs
Temperature3,927±170[6] K
Metallicity [Fe/H]−0.01±0.05[9] dex
Age46±6[7] Myr
Other designations
AG+62°410, BD+62°742, FK5 2397, GC 6496, HD 34255, HIP 24914, HR 1720, SAO 13460[10]
Database references
SIMBADdata

HD 34255, also known HR 1720, is a star located in the northern circumpolar constellation Camelopardalis, the giraffe. It has an apparent magnitude of 5.60,[2] allowing it to be faintly visible to the naked eye. The object is located relatively far at a distance of about 1.65 kly[1] but is approaching the Solar System with a heliocentric radial velocity of −7.7 km/s.[5]

This is a solitary,[11] evolved red supergiant with a stellar classification of K4 I.[3] It has 6.9 times the mass of the Sun and is said to be 46 million years old.[7] Despite the young age, it has already ceased hydrogen fusion at its core and now has an enlarged radius of 145 R☉.[6] HD 34255 radiates a bolometric luminosity over 6,000 times that of the Sun[8] from its photosphere at an effective temperature of 3,927 K,[6] giving it an orange glow. The star's metallicity – what astronomers dub as elements heavier than helium – is around solar level.[9]

  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 Adams1935 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Argue1966 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference Messineo2019 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference Wu2010 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).
  11. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).