HD 6

HD 6
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pisces
Right ascension 00h 05m 03.82339s[1]
Declination −00° 30′ 10.9306″[1]
Apparent magnitude (V) 6.30±0.01[2]
Characteristics
Evolutionary stage horizontal branch[3]
Spectral type K0 III[4]
U−B color index +1.03[5]
B−V color index +1.11[5]
Astrometry
Radial velocity (Rv)15.3±0.7[6] km/s
Proper motion (μ) RA: +45.245 mas/yr[1]
Dec.: −53.594 mas/yr[1]
Parallax (π)6.9277 ± 0.0368 mas[1]
Distance471 ± 3 ly
(144.3 ± 0.8 pc)
Absolute magnitude (MV)0.62[7]
Details
Mass1.95[8] M☉
Radius12.4[9] R☉
Luminosity72.4[10] L☉
Surface gravity (log g)1.8[3] cgs
Temperature4,807±75[9] K
Metallicity [Fe/H]−0.03[3] dex
Rotational velocity (v sin i)2.8±0.8[11] km/s
Age1.62[8] Gyr
Other designations
62 G. Piscium, AG−00°4, BD−01°4525, GC 51, HD 6, HIP 417, HR 2, SAO 128569[12]
Database references
SIMBADdata

HD 6 is a star in the equatorial constellation of Pisces, and is located a couple of degrees southeast of the intersection between the ecliptic and the celestial equator. It is a yellow-hued star that is just barely visible to the naked eye with an apparent visual magnitude of 6.3.[2] The star is located at a distance of 471 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of 15.3 km/s.[6] It has an absolute magnitude of 0.62.[7]

An evolved red giant with a stellar classification K0 III,[4] the star has moved off the main sequence by cooling and expanding. At the age of 1.6 billion years,[8] is now a red clump giant on the horizontal branch that is engaged in core helium fusion.[3] It has nearly double the mass of the Sun[8] and has expanded to 12.4[9] times the Sun's radius. The star is radiating 72 times the luminosity of the Sun[10] from its photosphere at an effective temperature of 4,807 K.[9]

  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 c d Cite error: The named reference Tautvaišienė2013 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Cousins1971 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 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 Cite error: The named reference Demarque2004 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Fekel1998 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).