HD 38858
From Infogalactic: the planetary knowledge core
(Redirected from HD 38858 b)
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Orion |
| Right ascension | 05h 48m 34.93996s[1] |
| Declination | −04° 05′ 40.7153″[1] |
| Apparent magnitude (V) | +5.97[2] |
| Characteristics | |
| Spectral type | G4V[3] |
| U−B color index | +0.10[2] |
| B−V color index | +0.64[2] |
| Astrometry | |
| Radial velocity (Rv) | +31.2[4] km/s |
| Proper motion (μ) | RA: 60.84 ± 0.41[1] mas/yr Dec.: –228.35 ± 0.33[1] mas/yr |
| Parallax (π) | 65.89 ± 0.41[1] mas |
| Distance | 49.5 ± 0.3 ly (15.18 ± 0.09 pc) |
| Details | |
| Mass | 0.886[5] M☉ |
| Radius | 0.9331 ± 0.0162[5] R☉ |
| Luminosity | 0.7943 ± 0.0101[5] L☉ |
| Surface gravity (log g) | 4.36 ± 0.06[3] cgs |
| Temperature | 5,660 ± 20[3] K |
| Metallicity [Fe/H] | –0.27 ± 0.03[3] dex |
| Rotational velocity (v sin i) | 2.61[6] km/s |
| Age | 6.2[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia |
data |
HD 38858 is a G-type star[3] 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.[8]
The last observation of this system for a dust disc or comet belt was in 2009 by the Spitzer telescope; a belt was inferred at 102 AU.[7] It has an inclination of 48◦.[9]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 32[11] M⊕ | 1.0376 ± 0.0189 | 407.15 ± 4.2857 | 0.27 ± 0.17 | — | — |
| Disk | 102–102 AU | — | — | |||
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found. Vizier catalog entry
- ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 5.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found. citing Lawler et al. 2009, and recalculating its distance.
- ↑ LTT 2380 -- High proper-motion Star, SIMBAD Astronomical Database, accessed 11 October 2012.
- ↑ Bryden et al., promised in Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Wyatt; m sin i is 0.0961 ± 0.012 MJ / 30.55 ± 4.11 (which Wyatt knew from most current cited paper Mayor, "HARPS XXXIV", 2011). Wyatt has likely factored in the inclination but did not state this outright in the arXiv version of the paper.
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