WASP-42

WASP-42
Observation data
Epoch J2000      Equinox J2000
Constellation Centaurus
Right ascension 12h 51m 55.5580s[1]
Declination −42° 04′ 25.095″[1]
Apparent magnitude (V) 12.6[2]
Characteristics
Evolutionary stage main-sequence star
Spectral type K1V[2]
Astrometry
Radial velocity (Rv)41.25[3] km/s
Proper motion (μ) RA: −49.875[3] mas/yr
Dec.: 4.963[3] mas/yr
Parallax (π)5.6209 ± 0.0153 mas[3]
Distance580 ± 2 ly
(177.9 ± 0.5 pc)
Details[4]
Mass0.881+0.086
−0.081 M☉
Radius0.850±0.035 R☉
Surface gravity (log g)4.50±0.18[5] cgs
Temperature5315±79[2] K
Metallicity [Fe/H]0.05±0.13 dex
Rotational velocity (v sin i)2.70±0.40 km/s
Age11.3+1.5
−4.8 Gyr
Other designations
2MASS J12515557-4204249[1]
Database references
SIMBADdata

WASP-42 is a K-type main-sequence star. Its surface temperature is 5315±79 K.[6] 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.[2]

Multiplicity surveys did not detect any stellar companions to WASP-42 in 2017.[7]

  1. ^ a b c "WASP-42". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-12-22.
  2. ^ a b c d 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, doi:10.1093/mnras/stw279, S2CID 44864064
  3. ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  4. ^ a b Cite error: The named reference Bonomo2017 was invoked but never defined (see the help page).
  5. ^ Mortier, A.; Santos, N. C.; Sousa, S. G.; Fernandes, J. M.; Adibekyan, V. Zh.; Delgado Mena, E.; Montalto, M.; Israelian, G. (2013), "New and updated stellar parameters for 90 transit hosts The effect of the surface gravity", Astronomy and Astrophysics, 558: A106, arXiv:1309.1998, Bibcode:2013A&A...558A.106M, doi:10.1051/0004-6361/201322240, S2CID 118750676
  6. ^ Southworth, J. (2016). "4. Physical Properties". High-precision photometry by telescope defocussing (PDF). Vol. VIII. WASP-22, WASP-41, WASP-41 and WASP-55. p. 4210. doi:10.1093/mnras/stw279. Retrieved 25 October 2023.
  7. ^ 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