| 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]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.889±0.058 MJ | 0.0442±0.0010 | 3.40883495(15) | <0.075 | 88.514±0.090° | 1.219±0.028 RJ |
References
- ^ 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.
- ^ a b c d e f 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 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.
- ^ a b c d 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.
- ^ "WASP-28". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 October 2025.
- ^ "WASP-28 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2025-10-29.
