HD 102272
| Observation data Epoch J2000.0 (ICRS) Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Leo |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 8.69[2] |
| Characteristics | |
| Spectral type | K0[3] III[2] |
| U−B Template:Engvar | 0.69[3] |
| B−V Template:Engvar | 1.02[2] |
| Astrometry | |
| Radial velocity (Rv) | −11.99±0.03[2] km/s |
| Proper motion (μ) | RA: −7.371[1] mas/yr Dec.: 7.639[1] mas/yr |
| Parallax (π) | 2.8571±0.1135 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 0.74[2] |
| Details[2] | |
| Mass | 1.01±0.122 Template:Solar mass |
| Radius | 8.02±2.14 Template:Solar radius |
| Luminosity | 25 Template:Solar luminosity |
| Surface gravity (log g) | 2.57±0.04 cgs |
| Temperature | 4,750±10 K |
| Metallicity [Fe/H] | −0.49±0.06 dex |
| Rotational velocity (v sin i) | 2.10±0.90 km/s |
| Age | 8.13 Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[4] | |
| Database references | |
| SIMBAD | data |
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HD 102272 is a star in the equatorial constellation of Leo. With an apparent visual magnitude of 8.69,[2] it is too faint to be visible to the naked eye. The star is located at a distance of approximately 1,140 light years based on parallax measurements, but is drifting closer to the Sun with a radial velocity of −12 km/s.[2] since 2008[update]Template:Dated maintenance category (articles)Script error: No such module "Check for unknown parameters"., two extrasolar planets are known to orbit the star.[5]
This is an evolved giant star[2] with a stellar classification of K0.[3] It is an estimated eight billion years old and has expanded to eight times the Sun's radius. The star has about the same mass as the Sun and is spinning with a projected rotational velocity of 2 km/s. It is radiating 25 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,750 K.[2]
Planetary system
In June 2008, the discovery of two extrasolar planets orbiting the star was announced.[5] The planets were detected using the radial velocity method with 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] The pair are close to a 4:1 orbital resonance with the outer planet in a high eccentricity orbit.[6]
Template:OrbitboxPlanet begin Template:OrbitboxPlanet Template:OrbitboxPlanet
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See also
References
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External links
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