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HD 83443 / Kalausi
Observation data; Epoch J2000.0 (ICRS) Equinox J2000.0 (ICRS)
Constellation	Vela
Right ascension	9h 37m 11.8275s
Declination	–43° 16′ 19.934″
Apparent magnitude (V)	8.23
Characteristics
Spectral type	K0 V
U−B color index	+0.50
B−V color index	+0.811
Variable type	Constant
Astrometry
Radial velocity (Rv)	+29.21±0.08 km/s
Proper motion (μ)	RA: 21.805(16) mas/yr ; Dec.: −120.094(18) mas/yr
Parallax (π)	24.4794 ± 0.0159 mas
Distance	133.24 ± 0.09 ly ; (40.85 ± 0.03 pc)
Absolute magnitude (MV)	5.04
Details
Mass	0.79±0.07 M☉; 0.98±0.07 M☉; 1.004±0.031 M☉
Radius	0.94±0.02 R☉
Luminosity	0.88 L☉
Surface gravity (log g)	4.43±0.08 cgs
Temperature	5,511±45 K
Metallicity [Fe/H]	0.34±0.03 dex
Rotation	35.3 d
Rotational velocity (v sin i)	1.4 km/s
Age	3.2 Gyr; 2.638±2.489 Gyr
Other designations
	Kalausi, CD–42°5452, GC 13300, HD 83443, HIP 47202, SAO 221348, 2MASS J09371182-4316198
Database references
SIMBAD	data

HD 83443 is an orange dwarf star approximately 133 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.^[11] The star HD 83443 is named Kalausi. The name was selected in the NameExoWorlds campaign by Kenya, during the 100th anniversary of the IAU. The word Kalausi means a very strong whirling column of wind in the Dholuo language.^[12]^[13]

Planetary system

The planet HD 83443 b was discovered in 2000 by the Geneva Extrasolar Planet Search Team led by Michel Mayor.^[11] 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.^[14] 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.^[5] 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.^[2] Another planet, designated HD 83443 c, was discovered in 2022 in a wide, eccentric 22-year orbit. It is suspected that HD 83443 c entered its current orbit due to the inward migration of HD 83443 b.^[15]

The HD 83443 planetary system^[2]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b (Buru)	>0.38 $M$ _J	0.039	2.98565±0.00003	0.013±0.013	—	—
c	1.5^+0.5 _−0.2 $M$ _J	8.0±0.8	8241⁺¹⁰¹⁹ ₋₅₃₀	0.76±0.05	—	—

References

^ ^a ^b ^c ^d ^e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ 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. arXiv:astro-ph/0310316. Bibcode:2004A&A...415..391M. doi:10.1051/0004-6361:20034250. S2CID 5233877.
^ Houk, N. (1978). "Michigan Catalogue of two dimensional spectral types for the HD stars". Michigan Spectral Survey. 2. Bibcode:1978mcts.book.....H.
^ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
^ ^a ^b Butler, R. Paul; et al. (2002). "On the Double-Planet System around HD 83443". The Astrophysical Journal. 578 (1): 565–572. arXiv:astro-ph/0206178. Bibcode:2002ApJ...578..565B. doi:10.1086/342471. hdl:2299/167. S2CID 15659545.
^ Nidever, David L.; et al. (2013). "Radial Velocities for 889 Late-Type Stars". The Astrophysical Journal Supplement Series. 141 (2): 503–522. arXiv:astro-ph/0112477. Bibcode:2002ApJS..141..503N. doi:10.1086/340570. S2CID 51814894.
^ ^a ^b Stassun, Keivan G.; et al. (2016). "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes". The Astronomical Journal. 153 (3): 136. arXiv:1609.04389. Bibcode:2017AJ....153..136S. doi:10.3847/1538-3881/aa5df3. S2CID 119219062.
^ ^a ^b ^c ^d Santos, N. C.; et al. (August 2013). "SWEET-Cat: A catalogue of parameters for Stars With ExoplanETs. I. New atmospheric parameters and masses for 48 stars with planets". Astronomy & Astrophysics. 556: 11. arXiv:1307.0354. Bibcode:2013A&A...556A.150S. doi:10.1051/0004-6361/201321286. S2CID 55237847. A150.
^ ^a ^b Delgado Mena, E.; et al. (April 2019), "Abundance to age ratios in the HARPS-GTO sample with Gaia DR2. Chemical clocks for a range of [Fe/H]", Astronomy & Astrophysics, 624: 24, arXiv:1902.02127, Bibcode:2019A&A...624A..78D, doi:10.1051/0004-6361/201834783, S2CID 90259810, A78
^ "HD 83443". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 28 August 2017.
^ ^a ^b "Exoplanets Galore!" (Press release). Garching, Germany: European Southern Observatory. April 15, 2000. Retrieved December 30, 2012.
^ "Approved names". NameExoworlds. IAU. Retrieved 2020-01-02.
^ "iau1912 — Press Release". www.iau.org. International Astronomical Union. Retrieved 2020-01-02.
^ "European Southern Observatory: Six Extrasolar Planets Discovered". SpaceRef Interactive Inc. 7 August 2000. Retrieved 2 August 2009.
^ Errico, Adriana; Wittenmyer, Robert A.; Horner, Jonathan; Li, Zhexing; Brandt, G. Mirek; Kane, Stephen R.; Fetherolf, Tara; Holt, Timothy R.; Carter, Brad; Clark, Jake T.; Butler, R. P.; Tinney, C. G.; Ballard, Sarah; Bowler, Brendan P.; Kielkopf, John; Liu, Huigen; Plavchan, Peter P.; Shporer, Avi; Zhang, Hui; Wright, Duncan J.; Addison, Brett C.; Mengel, Matthew W.; Okumura, Jack (2022), "HD 83443c: A Highly Eccentric Giant Planet on a 22 yr Orbit", The Astronomical Journal, 163 (6): 273, arXiv:2204.05711, Bibcode:2022AJ....163..273E, doi:10.3847/1538-3881/ac6589, S2CID 248118529