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'''HD 102272''' is a [[K-type star|K-type]] [[giant star|giant]] [[star]] approximately 800 [[light-year]]s away in the [[constellation]] of [[Leo (constellation)|Leo]]. {{As of|2008}}, two [[extrasolar planet]]s are known to orbit the star.<ref name="EPE">{{cite web |url=http://exoplanet.eu/star.php?st=HD+102272 |title=Notes for star HD 102272 |accessdate=2008-07-01 |work=The Extrasolar Planets Encyclopaedia |
'''HD 102272''' is a [[K-type star|K-type]] [[giant star|giant]] [[star]] approximately 800 [[light-year]]s away in the [[constellation]] of [[Leo (constellation)|Leo]]. {{As of|2008}}, two [[extrasolar planet]]s are known to orbit the star.<ref name="EPE">{{cite web |url=http://exoplanet.eu/star.php?st=HD+102272 |title=Notes for star HD 102272 |accessdate=2008-07-01 |work=The Extrasolar Planets Encyclopaedia |date= }}</ref> |
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== Planetary system == |
== Planetary system == |
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== External links == |
== External links == |
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* {{cite web |url=http://exoplanet.eu/star.php?st=HD+102272 |title=Notes for star HD 102272 |accessdate=2008-07-01 |work=The Extrasolar Planets Encyclopaedia |
* {{cite web |url=http://exoplanet.eu/star.php?st=HD+102272 |title=Notes for star HD 102272 |accessdate=2008-07-01 |work=The Extrasolar Planets Encyclopaedia |date= }} |
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* {{cite web | url=http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+102272 | title=HD 102272 | work=Exoplanets |accessdate=2008-11-09 }} |
* {{cite web | url=http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+102272 | title=HD 102272 | work=Exoplanets |accessdate=2008-11-09 }} |
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Observation data Epoch J2000.0 (ICRS) Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Leo |
Right ascension | 11h46m 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 mas[1] |
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 | |
Database references | |
SIMBAD | data |
HD 102272 is a K-type giant star approximately 800 light-years away in the constellationofLeo. As of 2008[update], two extrasolar planets are known to orbit the star.[5]
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 | — | — |
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