HD 102272

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HD 102272
Observation data
Epoch J2000.0 (ICRS)      Equinox J2000.0 (ICRS)
Constellation Leo
Right ascension 11h 46m 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[1] mas
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
HIP 57428
Database references
SIMBAD data

HD 102272 is a K-type giant star approximately 800 light-years away in the constellation of Leo. As of 2008, two extrasolar planets are known to orbit the star.[5]

Planetary system[edit]

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]

The HD 102272 planetary system[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

References[edit]

  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b HD 102272, entry, SIMBAD. Accessed on line June 18, 2008.
  3. ^ a b c d e f g h i j 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. 
  4. ^ From apparent magnitude and parallax.
  5. ^ a b "Notes for star HD 102272". The Extrasolar Planets Encyclopaedia. Retrieved 2008-07-01. 

External links[edit]


Coordinates: Sky map 11h 46m 23.5351s, +14° 07′ 26.350″