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) | 6.32[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 |
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]
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[]
- ^ a b c d e f g h i j k l 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.
- ^ a b c d e 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, S2CID 119257644.
- ^ a b c d e f 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, S2CID 119211439.
- ^ a b Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
- ^ a b 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, S2CID 118675933.
- ^ "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
Coordinates: 
00h 05m 03.80s, −00° 30′ 11.0″
- G-type giants
- Horizontal-branch stars
- Pisces (constellation)
- Durchmusterung objects
- Henry Draper Catalogue objects
- Hipparcos objects
- HR objects