HD 171238
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| 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] |
| 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[edit]
References[edit]
- ^ a b c d e van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752v1, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 Note: see VizieR catalogue I/311.
- ^ a b Nordström, B. et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics 418: 989–1019, arXiv:astro-ph/0405198, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959
- ^ Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982MSS...C03....0H
- ^ a b c Cutri, R. M. et al. (June 2003), 2MASS All Sky Catalog of point sources, NASA/IPAC, Bibcode:2003tmc..book.....C
- ^ a b c d e f g h i Ségransan, D. et al. (2009). "The CORALIE survey for southern extrasolar planets. XVI. Discovery of a planetary system around HD 147018 and of two long period and massive planets orbiting HD 171238 and HD 204313". Astronomy & Astrophysics 511: A45. arXiv:0908.1479. Bibcode:2010A&A...511A..45S. doi:10.1051/0004-6361/200912136.
Coordinates: 
18h 34m 43.6733s, −28° 04′ 20.328″
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