HD 6
Star in the constellation Pisces
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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.[3] The star is located at a distance of 471 light-years from the Sun based on parallax, and is drifting further away with a radial velocity of 14.9 km/s.[2] It has an absolute magnitude of 0.62.[1]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pisces[1] |
| Right ascension | 00h 05m 03.82275s[2] |
| Declination | −00° 30′ 10.9286″[2] |
| Apparent magnitude (V) | 6.30±0.01[3] |
| Characteristics | |
| Evolutionary stage | horizontal branch[4] |
| Spectral type | K0 III[5] |
| U−B color index | +1.03[6] |
| B−V color index | +1.11[6] |
| Astrometry | |
| Radial velocity (Rv) | +14.91±0.12[2] km/s |
| Proper motion (μ) | RA: +45.245 mas/yr[2] Dec.: −53.594 mas/yr[2] |
| Parallax (π) | 6.9277±0.0368 mas[2] |
| Distance | 471 ± 3 ly (144.3 ± 0.8 pc) |
| Absolute magnitude (MV) | 0.62[1] |
| Details | |
| Mass | 1.95[7] M☉ |
| Radius | 12.4[8] R☉ |
| Luminosity | 72.4[9] L☉ |
| Surface gravity (log g) | 1.8[4] cgs |
| Temperature | 4,807±75[8] K |
| Metallicity [Fe/H] | −0.03[4] dex |
| Rotational velocity (v sin i) | 2.8±0.8[10] km/s |
| Age | 1.62[7] Gyr |
| Other designations | |
| 62 G. Piscium, AG−00°4, BD−01°4525, GC 51, HD 6, HIP 417, HR 2, SAO 128569[11][12] | |
| Database references | |
| SIMBAD | data |
An evolved red giant with a stellar classification K0 III,[5] the star has moved off the main sequence by cooling and expanding. At the age of 1.6 billion years,[7] is now a red clump giant on the horizontal branch that is engaged in core helium fusion.[4] It has nearly double the mass of the Sun[7] and has expanded to 12.4[8] times the Sun's radius. The star is radiating 72 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 4,807 K.[8]