HD 83443

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HD 83443
Observation data
Epoch J2000.0 (ICRS)      Equinox J2000.0 (ICRS)
Constellation Vela
Right ascension 9h 37m 11.828s[1]
Declination –43° 16′ 19.94″[1]
Apparent magnitude (V) 8.24
Spectral type K0V
B−V color index 0.811
Proper motion (μ) RA: 23.00 ± 0.58[1] mas/yr
Dec.: –120.31 ± 0.54[1] mas/yr
Parallax (π) 24.29 ± 0.73[1] mas
Distance 134 ± 4 ly
(41 ± 1 pc)
Absolute magnitude (MV) 5.16
Mass 0.79 M
Radius 1.04 R
Temperature 5460 K
Metallicity [Fe/H] 0.33 dex
Other designations
CD–42°5452, HIP 47202
Database references

HD 83443 is an orange dwarf star approximately 134 light-years away[1] in the constellation of Vela. As of 2000, at least one extrasolar planet has been confirmed to be orbiting the star.[2]

Planetary system[edit]

The planet HD 83443 b was discovered in 2000 by the Geneva Extrasolar Planet Search Team led by Michel Mayor.[2] It has a minimum mass comparable to Saturn's, and its orbit at the time of discovery was one of the shortest known taking only three days to complete one revolution around the star. This hot Jupiter is likely to be slightly larger than Jupiter in radius.

In 2000, the same year that planet b was found, another planet around HD 83443 was announced by the Geneva Team. The new planet was designated as "HD 83443 c". It had a mass smaller than planet b and a short, very eccentric orbit.[3] Its orbital period, 28.9 days, was especially interesting, because it indicated a 10:1 orbital resonance between the planets. However, a team led by astronomer Paul Butler did not detect any signal indicating the existence of the second planet.[4] New observations by the Geneva team could not detect the signal either and the discovery claim had to be retracted. The origin of the signal, which was "highly significant" in the earlier data is not yet clear.[5]

The HD 83443 planetary system[5]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b >0.38 MJ 0.039 2.98565 ± 0.00003 0.013 ± 0.013


  1. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752Freely accessible. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ a b "Exoplanets Galore!" (Press release). Garching, Germany: European Southern Observatory. April 15, 2000. Retrieved December 30, 2012. 
  3. ^ "European Southern Observatory: Six Extrasolar Planets Discovered". SpaceRef Interactive Inc. 7 August 2000. Retrieved 2 August 2009. 
  4. ^ Butler, R. Paul; et al. (2002). "On the Double-Planet System around HD 83443". The Astrophysical Journal. 578 (1): 565–572. Bibcode:2002ApJ...578..565B. arXiv:astro-ph/0206178Freely accessible. doi:10.1086/342471. 
  5. ^ a b Mayor, M.; et al. (2004). "The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE". Astronomy and Astrophysics. 415 (1): 391–402. Bibcode:2004A&A...415..391M. arXiv:astro-ph/0310316Freely accessible. doi:10.1051/0004-6361:20034250. 

External links[edit]

  • "HD 83443". The Extrasolar Planets Encyclopaedia. Retrieved 2008-06-11. 

Coordinates: Sky map 09h 37m 11.83s, −43° 16′ 19.94″