WASP-28

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WASP-28
Observation data
Epoch J2000.0        Equinox J2000.0
Constellation Pisces [1]
Right ascension 23h 34m 27.88149s [2]
Declination −01° 34′ 48.1101″ [2]
Apparent magnitude  (V)12.03 [3]
Characteristics
Evolutionary stage main sequence [2]
Spectral type F8 [3]
Astrometry
Radial velocity (Rv)+25.20±1.08 [2] km/s
Proper motion (μ)RA: +22.422 mas/yr [2]
Dec.: +10.591 mas/yr [2]
Parallax (π)2.9215±0.0151  mas [2]
Distance 1,116 ± 6  ly
(342 ± 2  pc)
Details [3]
Mass 0.993±0.067 [4]   M☉
Radius 1.083±0.025 [4]   R☉
Surface gravity (log g)4.370±0.018  cgs
Temperature 6150±140  K
Metallicity [Fe/H]−0.29±0.10  dex
Rotational velocity (v sin i)3.25±0.34 km/s
Age 5.5±2.6 [4]   Gyr
Other designations
K2-1, EPIC 246375295, TOI-4518, TIC 398572544, WASP-28, 2MASS J23342787-0134482 [5]
Database references
SIMBAD data
Exoplanet Archive data

WASP-28 is a F8V-type main sequence star located 1116 light-years from Earth in the constellation of Pisces. It has a mass of 0.9 solar masses and a radius of 1.08 solar radii. [6] It is an aged and cool star being around 5 billion years old and having a temperature at around 6100 Kelvin. [3]

Planetary system

The only known exoplanet orbiting around this star is WASP-28b, a highly irradiated and inflated hot Jupiter. It has a mass of 0.9 Jupiters and a radius of 1.3 Jupiters. It orbits at a distance of 0.044 AU taking about 3.4 days to complete an orbit around its star. The orbit has an eccentricity of 0.975 and an inclination of 88.61°. [3]

The WASP-28 planetary system [4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 0.889±0.058  MJ 0.0442±0.00103.40883495(15)<0.07588.514±0.090 ° 1.219±0.028  RJ

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. 1 2 3 4 5 6 7 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. 1 2 3 4 5 Anderson, D. R.; Cameron, A. Collier; Hellier, C.; Lendl, M.; Lister, T. A.; Maxted, P. F. L.; Queloz, D.; Smalley, B.; Smith, A. M. S.; Triaud, A. H. M. J.; Brown, D. J. A.; Gillon, M.; Neveu-VanMalle, M.; Pepe, F.; Pollacco, D. (2015-03-01). "WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars". Astronomy & Astrophysics. 575: A61. arXiv: 1402.1482 . Bibcode:2015A&A...575A..61A. doi:10.1051/0004-6361/201423591. ISSN   0004-6361.
  4. 1 2 3 4 Močnik, T.; Hellier, C.; Anderson, D. R. (January 2020). "K2 Looks Toward WASP-28 and WASP-151". Publications of the Astronomical Society of the Pacific . 132 (1007): 014401. Bibcode:2020PASP..132a4401M. doi: 10.1088/1538-3873/ab5598 .
  5. ↑ "WASP-28". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 30 October 2025.
  6. ↑ "WASP-28 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2025-10-29.
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