HD 6
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 6.32.[2] The star is located at a distance of approximately 218 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +15 km/s.[1] It has an absolute magnitude of 0.62.[2]
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) | 6.32[2] |
Characteristics | |
Evolutionary stage | horizontal branch[3] |
Spectral type | G9III[4] |
B−V color index | 1.099±0.001[2] |
Astrometry | |
Radial velocity (Rv) | +14.98±0.14[1] km/s |
Proper motion (μ) | RA: +44.622[1] mas/yr Dec.: −53.462[1] mas/yr |
Parallax (π) | 14.98 ± 0.14[1] mas |
Distance | 218 ± 2 ly (66.8 ± 0.6 pc) |
Absolute magnitude (MV) | 0.62[2] |
Details | |
Mass | 1.4[3] M☉ |
Radius | 12.75+0.59 −0.42[1] R☉ |
Luminosity | 74.0±1.3[1] L☉ |
Surface gravity (log g) | 1.8[3] cgs |
Temperature | 4,740+80 −105[1] K |
Metallicity [Fe/H] | −0.03[3] dex |
Age | 9.00±0.12[5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
An evolved red giant with a stellar classification G9III,[4] the star has moved off the main sequence by cooling and expanding. At the age of nine billion years,[5] is now a red clump giant on the horizontal branch that is engaged in core helium fusion.[3] It has an estimated 1.4[3] times the mass of the Sun and has expanded to 13[1] times the Sun's radius. The star is radiating 74 times the luminosity of the Sun from its photosphere at an effective temperature of 4,740 K.[1]
References
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
- Tautvaišienė, G.; et al. (March 2013), "Red clump stars of the Milky Way - laboratories of extra-mixing", Monthly Notices of the Royal Astronomical Society, 430 (1): 621–627, arXiv:1304.4393, Bibcode:2013MNRAS.430..621T, doi:10.1093/mnras/sts663.
- Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
- Feuillet, Diane K.; et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal, 817 (1): 40, arXiv:1511.04088, Bibcode:2016ApJ...817...40F, doi:10.3847/0004-637X/817/1/40.
- "HD 6". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-07-02.
External links
- HD 6 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images