HD 102272
HD 102272 is a K-type giant star approximately 800 light-years away in the constellation of Leo. As of 2008, two extrasolar planets are known to orbit the star.[5]
| Observation data Epoch J2000.0 (ICRS) Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Leo |
| Right ascension | 11h 46m 23.54s[1] |
| Declination | +14° 07′ 26.3″[1] |
| Apparent magnitude (V) | 8.71[2] |
| Characteristics | |
| Spectral type | K0 [3] |
| U−B color index | 0.69 [3] |
| B−V color index | 1.00[2] |
| Astrometry | |
| Proper motion (μ) | RA: -6.54 ± 1.43[1] mas/yr Dec.: 6.21 ± 0.76[1] mas/yr |
| Parallax (π) | 4.10 ± 0.97[1] mas |
| Distance | approx. 800 ly (approx. 240 pc) |
| Absolute magnitude (MV) | ~1[4] |
| Details | |
| Mass | 1.9 ± 0.3 [3] M☉ |
| Radius | 10.1 ± 4.6 [3] R☉ |
| Surface gravity (log g) | 3.07 ± 0.12 [3] cgs |
| Temperature | 4908 ± 35 [3] K |
| Metallicity | [Fe/H] = −0.26 ± 0.08 [3] |
| Rotation | ~170 days [3] |
| Other designations | |
HIP 57428, SAO 99784, BD+14 2434[2] | |
| Database references | |
| SIMBAD | data |
Planetary system
In June 2008, the discovery of two extrasolar planets orbiting the star was announced.[5] The planets were discovered using the radial velocity method and the Hobby-Eberly Telescope. The radial velocity data clearly shows the presence of the inner planet (HD 102272 b.) Although there is evidence for another planet, there is insufficient data to unambiguously determine its orbit.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >5.9 ± 0.2 MJ | 0.614 ± 0.001 | 127.58 ± 0.30 | 0.05 ± 0.04 | — | — |
| c | >2.6 ± 0.4 MJ | 1.57 ± 0.05 | 520 ± 26 | 0.68 ± 0.06 | — | — |
References
- van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
- HD 102272, entry, SIMBAD. Accessed on line June 18, 2008.
- Niedzielski, A.; et al. (2009). "A Planet in a 0.6 AU Orbit Around the K0 Giant HD 102272". The Astrophysical Journal. 693 (1): 276–280. arXiv:0810.1710. Bibcode:2009ApJ...693..276N. doi:10.1088/0004-637X/693/1/276.
- From apparent magnitude and parallax.
- "Notes for star HD 102272". The Extrasolar Planets Encyclopaedia. Retrieved 2008-07-01.
External links
- "Notes for star HD 102272". The Extrasolar Planets Encyclopaedia. Retrieved 2008-07-01.
- "HD 102272". Exoplanets. Archived from the original on 2009-11-24. Retrieved 2008-11-09.
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