HD 4313
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pisces |
| Right ascension | 00h 45m 40.3578s[1] |
| Declination | +07° 50′ 42.075″[1] |
| Apparent magnitude (V) | 7.83[2] |
| Characteristics | |
| Spectral type | K2 IV |
| Astrometry | |
| Radial velocity (Rv) | 14.67[2] km/s |
| Proper motion (μ) | RA: −6.281[1] mas/yr Dec.: 6.566[1] mas/yr |
| Parallax (π) | 7.4492 ± 0.0259 mas[1] |
| Distance | 438 ± 2 ly (134.2 ± 0.5 pc) |
| Details | |
| Mass | 2.47±0.52[2] M☉ |
| Radius | 5.14[2] R☉ |
| Luminosity | +1.15±0.02[2] L☉ |
| Surface gravity (log g) | 3.24[2] cgs |
| Temperature | 4943[2] K |
| Metallicity [Fe/H] | +0.14±0.10[2] dex |
| Rotational velocity (v sin i) | 1.91±0.25[2] km/s |
| Age | 1.72±0.37 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 4313 is a K-type subgiant located in the constellation of Pisces. It hosts an extrasolar planet, and is drifting away from the Solar System with a radial velocity of 14.67 km/s
Physical properties
This is an aging star with a mass of twice the Sun, and radiating 1.15 times the luminosity. It also is a swollen star with 5.14 times the radius, and has a cool temperature of 4943 K. The "IV" in the spectral class means it's a K-type subgiant star which is starting to exhaust the hydrogen at its core, and cooling and expanding to become a red giant.
System
HD 4313 is a single star, which means it has no binary partners, but has a Jovian planet orbiting it. This planet was discovered in 2010.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.927±0.090 MJ | 1.157±0.097 | 356.21±0.88 | 0.147±0.047 | — | 1.2 RJ |
References
- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b c d e f g h i "Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2020-12-11.
