HD 38858
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 48m 34.94026s |
| Declination | −04° 05′ 40.7218″ |
| Apparent magnitude (V) | +5.97 |
| Characteristics | |
| Evolutionary stage | main sequence |
| 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: +61.427 mas/yr Dec.: −229.291 mas/yr |
| Parallax (π) | 65.7446±0.0307 mas |
| Distance | 49.61 ± 0.02 ly (15.210 ± 0.007 pc) |
| Absolute magnitude (MV) | +5.06 |
| 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 | |
| BD−04°1244, FK5 1155, GJ 1085, HD 38858, HIP 27435, LTT 2380, SAO 132554 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 38858 is a star in the Orion constellation. It is a G-type main-sequence star, located at a distance of about 50 light-years. It has an apparent magnitude of 5.97, therefore can be seen to the naked eye only in sufficiently dark skies.
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.