HD 70573
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 8h 22m 49.9514s |
| Declination | +01° 51′ 33.552″ |
| Apparent magnitude (V) | +8.70 |
| Characteristics | |
| Spectral type | G1.2V |
| B−V color index | 0.59 |
| Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | +19.5 km/s |
| Proper motion (μ) | RA: -54.00 mas/yr Dec.: -48.20 mas/yr |
| Parallax (π) | 21.9 mas |
| Distance | 149 ly (45.7 pc) |
| Absolute magnitude (MV) | +5.40 |
| Details | |
| Mass | 1 ± 0.1 M☉ |
| Radius | ? R☉ |
| Luminosity | 0.60 L☉ |
| Surface gravity (log g) | ? cgs |
| Temperature | 5737 ± 70 K |
| Metallicity | 66% |
| Rotation | ? |
| Age | 0.101 ± 0.024 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 70573 is a 9th magnitude star approximately 149 light-years away in the constellation of Hydra. The star is young, only 101 million years old.
Planetary system
On March 19, 2007, an extrasolar planet was announced, having been discovered by the radial velocity method.[1] This is thus far the youngest host star discovered to have an orbiting planet.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >6.1 ± 0.4 MJ | 1.76 ± 0.05 | 851.8 ± 11.6 | 0.4 ± 0.1 | — | — |
See also
References
- 1 2 Setiawan; et al. (2007). "Evidence for a Planetary Companion around a Nearby Young Star". The Astrophysical Journal Letters. 660 (2): L145–L148. arXiv:0704.0441
. Bibcode:2007ApJ...660L.145S. doi:10.1086/518213.
External links
- "Notes for star HD 70573". The Extrasolar Planet Encyclopaedia.
Coordinates: 
08h 22m 49.9514s, +01° 51′ 33.552″
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