HD 38858
HD 38858 is a G-type star, much like The Sun, with one detected planet. The planet, designated HD 38858 b, is about twice the mass of Uranus and orbits in the star's habitable zone.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 48m 34.93996s |
| Declination | −04° 05′ 40.7153″ |
| Apparent magnitude (V) | +5.97 |
| Characteristics | |
| Spectral type | G4V |
| U−B color index | +0.10 |
| B−V color index | +0.64 |
| Astrometry | |
| Radial velocity (Rv) | +31.2 km/s |
| Proper motion (μ) | RA: 60.84 ± 0.41 mas/yr Dec.: –228.35 ± 0.33 mas/yr |
| Parallax (π) | 65.89 ± 0.41 mas |
| Distance | 49.5 ± 0.3 ly (15.18 ± 0.09 pc) |
| Details | |
| Mass | 0.886 M☉ |
| Radius | 0.9331 ± 0.0162 R☉ |
| Luminosity | 0.7943 ± 0.0101 L☉ |
| Surface gravity (log g) | 4.36 ± 0.06 cgs |
| Temperature | 5,660 ± 20 K |
| Metallicity [Fe/H] | –0.27 ± 0.03 dex |
| Rotational velocity (v sin i) | 2.61 km/s |
| Age | 6.2 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
The last observation of this system for a dust disc or comet belt was in 2009 by the Spitzer Space Telescope; a belt was inferred at 102 AU. It has an inclination of 48◦.
The star exhibit a magnetic activity cycle remarkably similar to that of Sun, with the period of 10.8 years.
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