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m Delink dates (WP:MOSUNLINKDATES) using Project:AWB
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| epoch = [[J2000.0]] ([[International Celestial Reference System|ICRS]]) |
| epoch = [[J2000.0]] ([[International Celestial Reference System|ICRS]]) |
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| constell = [[Leo (constellation)|Leo]] |
| constell = [[Leo (constellation)|Leo]] |
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| ra = {{RA|11|46|23.5351}}<ref name=sb>{{SIMBAD link|HD+102272|HD 102272}}, entry, [[SIMBAD]]. Accessed on line |
| ra = {{RA|11|46|23.5351}}<ref name=sb>{{SIMBAD link|HD+102272|HD 102272}}, entry, [[SIMBAD]]. Accessed on line June 18, 2008.</ref> |
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| dec = {{DEC|+14|07|26.350}}<ref name=sb /> |
| dec = {{DEC|+14|07|26.350}}<ref name=sb /> |
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| appmag_v = 8.71<ref name=sb /> |
| appmag_v = 8.71<ref name=sb /> |
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}} |
}} |
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{{Starbox character |
{{Starbox character |
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| class = K0<ref name=pp>[http://luth7.obspm.fr/~schneider/HD_102272a.pdf A Planetary System Around the K0 Giant HD 102272], A. Niedzielski et al., preprint. Submitted to ''Astrophysical Journal Letters''. Accessed on line |
| class = K0<ref name=pp>[http://luth7.obspm.fr/~schneider/HD_102272a.pdf A Planetary System Around the K0 Giant HD 102272], A. Niedzielski et al., preprint. Submitted to ''Astrophysical Journal Letters''. Accessed on line June 18, 2008.</ref> |
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| b-v = 1.00<ref name=sb /> |
| b-v = 1.00<ref name=sb /> |
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| u-b = 0.69<ref name=pp /> |
| u-b = 0.69<ref name=pp /> |
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== References == |
== References == |
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{{ |
{{Reflist}} |
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== External links == |
== External links == |
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Leo |
Right ascension | 11h46m 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 mas[1] |
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] cgs |
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 constellationofLeo. As of 2008[update], two extrasolar planets are known to orbit the star.[3]
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 | Inclination | Radius |
---|---|---|---|---|---|---|
b | >5.9 ± 0.2 MJ | 0.614 ± 0.001 | 127.58 ± 0.30 | 0.05 ± 0.04[2] | — | — |
c | >2.6 ± 0.4 MJ | 1.57 ± 0.05 | 520 ± 26 | 0.68 ± 0.06[2] | — | — |
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