Astronomy:HD 102272
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Leo |
| Right ascension | 11h 46m 23.535s[1] |
| Declination | +14° 07′ 26.35″[1] |
| Apparent magnitude (V) | 8.69[2] |
| Characteristics | |
| Spectral type | K0[3] III[2] |
| U−B color index | 0.69[3] |
| B−V color index | 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[1] mas |
| Distance | 1,140 ± 50 ly (350 ± 10 pc) |
| Absolute magnitude (MV) | 0.74[2] |
| Details[2] | |
| Mass | 1.01±0.122 M☉ |
| Radius | 8.02±2.14 R☉ |
| Luminosity | 25 L☉ |
| 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 |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 syat 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] (As of 2008), 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]
| 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 | — | — |
See also
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Deka-Szymankiewicz, B. et al. (2018). "The Penn State - Toruń Centre for Astronomy Planet Search stars. IV. Dwarfs and the complete sample". Astronomy and Astrophysics 615: A31. doi:10.1051/0004-6361/201731696. Bibcode: 2018A&A...615A..31D.
- ↑ 3.0 3.1 3.2 3.3 3.4 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. doi:10.1088/0004-637X/693/1/276. Bibcode: 2009ApJ...693..276N.
- ↑ "HD 102272". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+102272.
- ↑ 5.0 5.1 "Notes for star HD 102272". Extrasolar Planets Encyclopaedia. http://exoplanet.eu/star.php?st=HD+102272. Retrieved 2008-07-01.
- ↑ Antoniadou, Kyriaki I.; Voyatzis, George (October 2016). "Orbital stability of coplanar two-planet exosystems with high eccentricities". Monthly Notices of the Royal Astronomical Society 461 (4): 3822–3834. doi:10.1093/mnras/stw1553. Bibcode: 2016MNRAS.461.3822A.
External links
- "Notes for star HD 102272". 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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