Astronomy:HD 103197
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 11h 52m 52.97822s[1] |
| Declination | –50° 17′ 34.1592″[1] |
| Apparent magnitude (V) | 9.40[2] |
| Characteristics | |
| Spectral type | K1V(p)[3] |
| Apparent magnitude (B) | 10.26[2] |
| Apparent magnitude (J) | 7.916±0.023[2] |
| Apparent magnitude (H) | 7.600±0.051[2] |
| Apparent magnitude (K) | 7.426±0.027[2] |
| B−V color index | 0.860±0.023[2] |
| Astrometry | |
| Radial velocity (Rv) | −4.55±0.21[1] km/s |
| Proper motion (μ) | RA: –80.938[1] mas/yr Dec.: +7.188[1] mas/yr |
| Parallax (π) | 17.4700 ± 0.0294[1] mas |
| Distance | 186.7 ± 0.3 ly (57.24 ± 0.10 pc) |
| Absolute magnitude (MV) | 5.79[2] |
| Details | |
| Mass | 0.90[4] M☉ |
| Radius | 0.95±0.02[1] R☉ |
| Luminosity | 0.566+0.002 −0.001[1] L☉ |
| Surface gravity (log g) | 4.40±0.11[4] cgs |
| Temperature | 5,303±58[4] K |
| Metallicity [Fe/H] | 0.21±0.04[4] dex |
| Rotation | 51±5 d[4] |
| Rotational velocity (v sin i) | 0.602[5] km/s |
| Age | 4.872±4.294[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
HD 103197 is a star with a planetary companion in the southern constellation of Centaurus. It has an apparent visual magnitude of 9.40,[2] which is too faint to be viewed with the naked eye. Based on parallax measurements, HD 103197 is located at a distance of 187 light years from the Sun. It is drifting closer with a radial velocity of −4.6 km/s.[1]
This is a K-type main-sequence star with a stellar classification of K1V(p). In 1978, N. Houk noted that the cores of the star's H and K lines are weakly in emission; hence the 'p' code indicating a spectral peculiarity.[3] The star is an estimated five billion years old with a projected rotational velocity of approximately 0.6 km/s[5] and it appears to be very inactive. It has 90% of the mass and 95% of the radius of the Sun. Its metal content is five-eighths greater than in the Sun.[4]
In 2009, a gas giant exoplanet companion was discovered using the radial velocity method. This object is orbiting the host star at a distance of 0.249 astronomical unit|AU (37.2 Gm) and a period of 47.84 d, with what is assumed to be a circular orbit.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥31.2 ± 2.0 M⊕ | 0.249 ± 0.004 | 47.84 ± 0.03 | 0.0(fixed) | — | — |
See also
- List of extrasolar planets
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. 2. Ann Arbor: Dept. of Astronomy, University of Michigan. Bibcode: 1978mcts.book.....H.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 Mordasini, C. et al. (2011). "The HARPS search for southern extrasolar planets XXIV. Companions to HD 85390, HD 90156, and HD 103197: a Neptune analog and two intermediate-mass planets". Astronomy and Astrophysics 526: A111. doi:10.1051/0004-6361/200913521. Bibcode: 2011A&A...526A.111M. http://www.aanda.org/articles/aa/full_html/2011/02/aa13521-09/aa13521-09.html.
- ↑ 5.0 5.1 5.2 Costa Silva, A. R. et al. (February 2020). "Chemical abundances of 1111 FGK stars from the HARPS-GTO planet search sample. III. Sulfur". Astronomy & Astrophysics 634: 10. doi:10.1051/0004-6361/201936523. A136. Bibcode: 2020A&A...634A.136C.
Coordinates: 
11h 52m 52.9787s, −50° 17′ 34.160″
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