Article · Wikipedia archive · Last revised Jul 20, 2026

WASP-23

WASP-23 is a K1V-type main sequence star located 671 light-years from Earth in the constellation of Puppis. It has a mass of 0.84 solar masses and a radius of 0.88 solar radii. It is around 6.2 billion years old and has an effective temperature of 5046 Kelvin.

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Jul 20, 2026
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WASP-23
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Puppis1
Right ascension 06h 44m 30.61336s2
Declination −42° 45′ 42.6668″2
Apparent magnitude (V) 12.523
Characteristics
Evolutionary stage main sequence4
Spectral type K1V4
Astrometry
Radial velocity (Rv)+5.29±0.522 km/s
Proper motion (μ) RA: −8.917 mas/yr2
Dec.: −87.711 mas/yr2
Parallax (π)4.8598±0.0086 mas2
Distance671 ± 1 ly
(205.8 ± 0.4 pc)
Details5
Mass0.78+0.13
−0.12 M☉
Radius0.765+0.033
−0.049 R☉
Surface gravity (log g)4.4±0.24 cgs
Temperature5,150±100 K
Metallicity [Fe/H]−0.05±0.13 dex
Rotational velocity (v sin i)2.2±0.3 km/s
Age6.2+5.6
−2.5 Gyr
Other designations
TOI-477, TIC 170102285, WASP-23, GSC 07635-013763
Database references
SIMBADdata
Exoplanet Archivedata

WASP-23 is a K1V-type main sequence star located 671 light-years from Earth in the constellation of Puppis. It has a mass of 0.84 solar masses and a radius of 0.88 solar radii. It is around 6.2 billion years old and has an effective temperature of 5046 Kelvin.6

Planetary system

There is only one known exoplanet orbiting this star named WASP-23b that was discovered by the transit method in the year 2010 by Triaud et al. It is a hot Jupiter with similar mass and radius to Jupiter.4

The WASP-23 planetary system5
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination
(°) 		Radius
b 0.879+0.095
−0.10 MJ 		0.0370+0.0019
−0.0022 		2.9444300(11) <0.065 88.39+0.79
−0.45 		0.962+0.047
−0.056 RJ
References

References

  1. Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  2. 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.
  3. "WASP-23". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 October 2025.
  4. Triaud, A. H. M. J.; Queloz, D.; Hellier, C.; Gillon, M.; Smalley, B.; Hebb, L.; Cameron, A. Collier; Anderson, D.; Boisse, I.; Hébrard, G.; Jehin, E.; Lister, T.; Lovis, C.; Maxted, P. F. L.; Pepe, F. (2011-07-01). "WASP-23b: a transiting hot Jupiter around a K dwarf and its Rossiter-McLaughlin effect". Astronomy & Astrophysics. 531: A24. arXiv:1103.2603. Bibcode:2011A&A...531A..24T. doi:10.1051/0004-6361/201016367. ISSN 0004-6361.
  5. Bonomo, A. S.; Desidera, S.; et al. (June 2017). "The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy & Astrophysics. 602: A107. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882.
  6. "WASP-23 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2025-10-29.