HD 102272
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| Observation data Epoch J2000.0 (ICRS) Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Leo |
| Right ascension | 11h 46m 23.5351s[1] |
| Declination | +14° 07′ 26.350″[1] |
| Apparent magnitude (V) | 8.71[1] |
| Characteristics | |
| Spectral type | K0 [2] |
| U−B color index | 0.69 [2] |
| B−V color index | 1.00[1] |
| Astrometry | |
| Proper motion (μ) | RA: −7.88[1] mas/yr Dec.: 7.41[1] mas/yr |
| Parallax (π) | 2.76 ± 1.11[1] mas |
| Distance | 1200±300 ly (360±90[3] pc) |
| Absolute magnitude (MV) | ~1[4] |
| Details | |
| Mass | 1.9 ± 0.3 [2] M☉ |
| Radius | 10.1 ± 4.6 [2] R☉ |
| Surface gravity (log g) | 3.07 ± 0.12 [2] |
| Temperature | 4908 ± 35 [2] K |
| Metallicity | [Fe/H] = −0.26 ± 0.08 [2] |
| Rotation | ~170 days [2] |
| Other designations | |
|
HIP 57428
|
|
| Database references | |
| SIMBAD | data |
HD 102272 is a K-type giant star approximately 1,200 light-years away in the constellation of Leo. As of 2008[update], two extrasolar planets are known to orbit the star.[3]
[edit] Planetary system
In June 2008, the discovery of two extrasolar planets orbiting the star was announced.[3] 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.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
|---|---|---|---|---|
| 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 |
[edit] References
- ^ a b c d e f g HD 102272, entry, SIMBAD. Accessed on line June 18, 2008.
- ^ a b c d e f g h i j Niedzielski et al. (2009). "A Planet in a 0.6 AU Orbit Around the K0 Giant HD 102272" (abstract). The Astrophysical Journal 693 (1): 276–280. Bibcode 2009ApJ...693..276N. doi:10.1088/0004-637X/693/1/276. http://www.iop.org/EJ/abstract/0004-637X/693/1/276. (web preprint)
- ^ a b c "Notes for star HD 102272". The Extrasolar Planets Encyclopaedia. http://exoplanet.eu/star.php?st=HD+102272. Retrieved 2008-07-01.
- ^ From apparent magnitude and parallax.
[edit] External links
- "Notes for star HD 102272". The Extrasolar Planets Encyclopaedia. http://exoplanet.eu/star.php?st=HD+102272. Retrieved 2008-07-01.
- "HD 102272". Exoplanets. http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+102272. Retrieved 2008-11-09.
Coordinates: 
11h 46m 23.5351s, +14° 07′ 26.350″
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