| Observation data Epoch J2000.0 ( ICRS) 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 mas [1] |
| 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 [update], 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
- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv: 2012.01533. Bibcode: 2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi: 10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b c d e f g h i j 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. arXiv: 1801.02899. Bibcode: 2018A&A...615A..31D. doi: 10.1051/0004-6361/201731696. S2CID 85526201.
- ^ a b c d e 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. arXiv: 0810.1710. Bibcode: 2009ApJ...693..276N. doi: 10.1088/0004-637X/693/1/276. S2CID 16074041.
- ^ "HD 102272". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-01-17.
- ^ a b "Notes for star HD 102272". Extrasolar Planets Encyclopaedia. Archived from the original on July 25, 2008. 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. arXiv: 1606.07743. Bibcode: 2016MNRAS.461.3822A. doi: 10.1093/mnras/stw1553.
External links
- "Notes for star HD 102272". Extrasolar Planets Encyclopaedia. Archived from the original on July 25, 2008. Retrieved 2008-07-01.
- "HD 102272". Exoplanets. Archived from the original on 2009-11-24. Retrieved 2008-11-09.
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