Edge Rewrite
restyle Source code View original
// HTMLRewriter · presentation

This page was redesigned at the edge.

Cloudflare fetched the original article and streamed it through HTMLRewriter to apply an entirely new visual system without rebuilding the source page.

Jump to content

WASP-42

Coordinates: Sky map 12h 51m 55.5580s, −42° 04′ 25.0949″
From Wikipedia, the free encyclopedia
(Redirected from WASP-42b)
WASP-42
Observation data
Epoch J2000      Equinox ICRS
Constellation Centaurus[1]
Right ascension 12h 51m 55.5581s[2]
Declination −42° 04′ 25.096″[2]
Apparent magnitude (V) 12.6[3]
Characteristics
Evolutionary stage main-sequence star
Spectral type K1V[3]
Astrometry
Radial velocity (Rv)−4.22±0.41[2] km/s
Proper motion (μ) RA: −49.875 mas/yr[2]
Dec.: 4.963 mas/yr[2]
Parallax (π)5.6209±0.0153 mas[2]
Distance580 ± 2 ly
(177.9 ± 0.5 pc)
Details
Mass0.881+0.086
−0.081[4] M☉
Radius0.850±0.035[4] R☉
Luminosity0.48[5] L☉
Surface gravity (log g)4.52[5] cgs
Temperature5,259[5] K
Metallicity [Fe/H]0.05±0.13[4] dex
Rotational velocity (v sin i)2.70±0.40[4] km/s
Age11.3+1.5
−4.8[4] Gyr
Other designations
TOI-769, TIC 248075138, WASP-42, 2MASS J12515557-4204249[6]
Database references
SIMBADdata
Exoplanet Archivedata

WASP-42 is a K-type main-sequence star about 580 light-years away in the constellation Centaurus. Its surface temperature is 5315±79 K.[7] WASP-42 is similar to the Sun in concentration of heavy elements, with metallicity ([Fe/H]) of 0.05±0.13, and is much older than the Sun at 11.3+1.5
−4.8 billion years.[4] The star does exhibit starspot activity as is typical for its spectral class.[3]

Multiplicity surveys did not detect any stellar companions to WASP-42 in 2017.[8]

Planetary system

[edit]

In 2012, one planet, named WASP-42b, was discovered[9] on a tight, mildly eccentric orbit.[4] The planetary equilibrium temperature is 1,021±19 K.[3]

The WASP-42 planetary system[4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination
(°)		 Radius
b 0.501±0.034 MJ 0.0548+0.0017
−0.0018		 4.9816872±0.0000073 0.062+0.013
−0.011		 88.30+0.26
−0.23		 1.063±0.051 RJ

References

[edit]
  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 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 Southworth, John; Tregloan-Reed, J.; Andersen, M. I.; Calchi Novati, S.; Ciceri, S.; Colque, J. P.; D'Ago, G.; Dominik, M.; Evans, D.; Gu, S. -H.; Herrera-Cruces, A.; Hinse, T. C.; Jorgensen, U. G.; Juncher, D.; Kuffmeier, M.; Mancini, L.; Peixinho, N.; Popovas, A.; Rabus, M.; Skottfelt, J.; Tronsgaard, R.; Unda-Sanzana, E.; Wang, X. -B.; Wertz, O.; Alsubai, K. A.; Andersen, J. M.; Bozza, V.; Bramich, D. M.; Burgdorf, M.; et al. (2015), High-precision photometry by telescope defocussing. III. WASP-22, WASP-41, WASP-42 and WASP-55, arXiv:1512.05549, Bibcode:2016MNRAS.457.4205S, doi:10.1093/mnras/stw279, S2CID 44864064
  4. 1 2 3 4 5 6 7 8 Bonomo, A. S.; Desidera, S.; Benatti, S.; Borsa, F.; Crespi, S.; Damasso, M.; Lanza, A. F.; Sozzetti, A.; Lodato, G.; Marzari, F.; Boccato, C.; Claudi, R. U.; Cosentino, R.; Covino, E.; Gratton, R.; Maggio, A.; Micela, G.; Molinari, E.; Pagano, I.; Piotto, G.; Poretti, E.; Smareglia, R.; Affer, L.; Biazzo, K.; Bignamini, A.; Esposito, M.; Giacobbe, P.; Hébrard, G.; Malavolta, L.; et al. (2017), "The GAPS Programme with HARPS-N@TNG XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets", Astronomy & Astrophysics, A107: 602, arXiv:1704.00373, Bibcode:2017A&A...602A.107B, doi:10.1051/0004-6361/201629882, S2CID 118923163
  5. 1 2 3 De Laverny, Patrick; Ligi, Roxanne; Crida, Aurélien; Recio-Blanco, Alejandra; Palicio, Pedro A. (2025). "The Gaia spectroscopic catalogue of exoplanets and host stars". Astronomy & Astrophysics. 699: A100. arXiv:2505.22205. Bibcode:2025A&A...699A.100D. doi:10.1051/0004-6361/202554739.
  6. ↑ "WASP-42". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-12-22.
  7. ↑ Southworth, John; et al. (2016). "High-precision photometry by telescope defocussing – VIII. WASP-22, WASP-41, WASP-42 and WASP-55". Monthly Notices of the Royal Astronomical Society. 457 (4): 4205–4217. arXiv:1512.05549. Bibcode:2016MNRAS.457.4205S. doi:10.1093/mnras/stw279.
  8. ↑ Evans, D. F.; Southworth, J.; Smalley, B.; Jørgensen, U. G.; Dominik, M.; Andersen, M. I.; Bozza, V.; Bramich, D. M.; Burgdorf, M. J.; Ciceri, S.; d'Ago, G.; Figuera Jaimes, R.; Gu, S.-H.; Hinse, T. C.; Henning, Th.; Hundertmark, M.; Kains, N.; Kerins, E.; Korhonen, H.; Kokotanekova, R.; Kuffmeier, M.; Longa-Peña, P.; Mancini, L.; MacKenzie, J.; Popovas, A.; Rabus, M.; Rahvar, S.; Sajadian, S.; Snodgrass, C.; et al. (2018), "High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). II. Lucky Imaging results from 2015 and 2016", Astronomy & Astrophysics, 610: A20, arXiv:1709.07476, Bibcode:2018A&A...610A..20E, doi:10.1051/0004-6361/201731855, S2CID 53400492
  9. ↑ Lendl, M.; Anderson, D. R.; Collier-Cameron, A.; Doyle, A. P.; Gillon, M.; Hellier, C.; Jehin, E.; Lister, T. A.; Maxted, P. F. L.; Pepe, F.; Pollacco, D.; Queloz, D.; Smalley, B.; Ségransan, D.; Smith, A. M. S.; Triaud, A. H. M. J.; Udry, S.; West, R. G.; Wheatley, P. J. (2012), "WASP-42 b and WASP-49 b: two new transiting sub-Jupiters", Astronomy & Astrophysics, 544: A72, arXiv:1205.2757, Bibcode:2012A&A...544A..72L, doi:10.1051/0004-6361/201219585, S2CID 54186638
Retrieved from "https://en.wikipedia.org/w/index.php?title=WASP-42&oldid=1341553964"