HD 143361

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HD 143361
Observation data
Epoch J2000      Equinox J2000
Constellation Norma
Right ascension 16h 01m 50.34705s[1]
Declination –44° 26′ 04.3214″[1]
Apparent magnitude (V) 9.20[2]
Spectral type G6 V[3]
Apparent magnitude (B) ~9.93[4]
Apparent magnitude (V) ~9.16[4]
Apparent magnitude (J) 7.905 ± 0.026[5]
Apparent magnitude (H) 7.572 ± 0.038[5]
Apparent magnitude (K) 7.488 ±0.018[5]
B−V color index 0.773[2]
Radial velocity (Rv) –1.5 ± 0.7[4] km/s
Proper motion (μ) RA: –158.32[1] mas/yr
Dec.: –118.21[1] mas/yr
Parallax (π) 15.23 ± 1.18[1] mas
Distance 210 ± 20 ly
(66 ± 5 pc)
Mass 0.93[6] M
Temperature 5,420[7] K
Metallicity [Fe/H] 0.06[2] dex
Age 8.1[7] Gyr
Other designations
CD–44 10569, HD 143361, HIP 78521, SAO 226454.
Database references
Extrasolar Planets

HD 143361 is a binary star in the southern constellation Norma. With an apparent visual magnitude of 9.20,[2] this star is too dim to be seen with the naked eye. It is close enough to the Earth that its distance can be determined using parallax measurements, yielding a value of roughly 210 light-years (64 parsecs).[1]

This is a G-type main sequence star with a stellar classification of G6 V.[3] It has around 95% of the Sun's mass and is around 8.1[7] billion years old. In 2007, it was discovered that it has a companion—an M-type star with a classification in the range M3.5–M6.5 and around 14% of the mass of the Sun. The two are separated by about 30.9 AU and have an orbital eccentricity of 0.69.[6]

Planetary system[edit]

In October 2008 the planet HD 143361 b was reported to be orbiting this star. This object was detected using the radial velocity method during an astronomical survey conducted by the Magellan Planet Search Program using the MIKE echelle spectrograph on the 6.5-m Magellan II (Clay) telescope.[6]

The HD 143361 planetary system
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 3.12 ± 1.44 MJ 2 1057 ± 20 0.15 ± 0.17

See also[edit]


  1. ^ a b c d e f van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Jenkins, J. S.; et al. (July 2008), "Metallicities and activities of southern stars", Astronomy and Astrophysics, 485 (2): 571–584, arXiv:0804.1128Freely accessible, Bibcode:2008A&A...485..571J, doi:10.1051/0004-6361:20078611 
  3. ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H 
  4. ^ a b c "NLTT 41735 -- High proper-motion Star", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2009-06-10 
  5. ^ a b c Cutri, R. M.; et al. (June 2003), 2MASS All Sky Catalog of point sources, NASA/IPAC, Bibcode:2003tmc..book.....C 
  6. ^ a b c Minniti, Dante; et al. (2009), "Low-Mass Companions for Five Solar-Type Stars From the Magellan Planet Search Program", The Astrophysical Journal, 693 (2): 1424–1430, arXiv:0810.5348Freely accessible, Bibcode:2009ApJ...693.1424M, doi:10.1088/0004-637X/693/2/1424 
  7. ^ a b c Nordström, B.; et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics, 418: 989–1019, arXiv:astro-ph/0405198Freely accessible, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959 

External links[edit]

Coordinates: Sky map 16h 01m 50.348s, −44° 26′ 04.33″