HD 171238
From Infogalactic: the planetary knowledge core
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 34m 43.67500s[1] |
| Declination | –28° 04′ 20.3381″[1] |
| Apparent magnitude (V) | 8.606[2] |
| Characteristics | |
| Spectral type | G8 V[3] |
| Apparent magnitude (B) | 9.40 |
| Apparent magnitude (J) | 7.244[4] |
| Apparent magnitude (H) | 6.868[4] |
| Apparent magnitude (K) | 6.831[4] |
| B−V color index | 0.74[5] |
| Astrometry | |
| Radial velocity (Rv) | 21.1[2] km/s |
| Proper motion (μ) | RA: −29.46±1.64[1] mas/yr Dec.: −111.01±1.05[1] mas/yr |
| Parallax (π) | 19.89 ± 1.15[1] mas |
| Distance | 164 ± 9 ly (50 ± 3 pc) |
| Absolute magnitude (MV) | 5.15[5] |
| Details | |
| Mass | 0.943±0.033[5] M☉ |
| Surface gravity (log g) | 4.43±0.04[5] cgs |
| Temperature | 5467±55[5] K |
| Metallicity | 0.17±0.007[5] |
| Rotational velocity (v sin i) | 1.48[5] km/s |
| Age | 4.92±4.11[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia |
data |
HD 171238 is a 9th magnitude G-type main sequence star located approximately 164 light years away in the constellation Sagittarius. This star is a little bit cooler, less massive, older, and more metallic than the Sun. In August 2009, it was announced that this star has a planet.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥ 2.6±0.15 MJ | 2.54±0.06 | 1523+40 −45 |
0.4+0.061 −0.065 |
— | — |
See also
References
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18h 34m 43.6733s, −28° 04′ 20.328″
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