Astronomy:WASP-42
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Short description: Star in the constellation Centaurus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[3] mas |
| Distance | 580 ± 2 ly (177.9 ± 0.5 pc) |
| Details[4] | |
| Mass | 0.881+0.086−0.081 M☉ |
| Radius | 0.850±0.035 R☉ |
| Surface gravity (log g) | 4.50±0.18[5] cgs |
| Temperature | 5315±79[2] K |
| Metallicity [Fe/H] | 0.05±0.13 dex |
| Rotational velocity (v sin i) | 2.70±0.40 km/s |
| Age | 11.3+1.5−4.8 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
Planetary system
In 2012, one planet, named WASP-42b, was discovered[8] on a tight, mildly eccentric orbit.[4] The planetary equilibrium temperature is 1021±19 K.[2]
| 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
- ↑ 1.0 1.1 1.2 "WASP-42". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=WASP-42.
- ↑ 2.0 2.1 2.2 2.3 2.4 Southworth, John; Tregloan-Reed, J.; Andersen, M. I.; Calchi Novati, S.; Ciceri, S.; Colque, J. P.; D'Ago, G.; Dominik, M. et al. (2015), High-precision photometry by telescope defocussing. III. WASP-22, WASP-41, WASP-42 and WASP-55, doi:10.1093/mnras/stw279
- ↑ 3.0 3.1 3.2 3.3 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 4.0 4.1 4.2 4.3 Bonomo, A. S.; Desidera, S.; Benatti, S.; Borsa, F.; Crespi, S.; Damasso, M.; Lanza, A. F.; Sozzetti, A. 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, doi:10.1051/0004-6361/201629882, Bibcode: 2017A&A...602A.107B
- ↑ 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, doi:10.1051/0004-6361/201322240, Bibcode: 2013A&A...558A.106M
- ↑ Southworth, J. (2016). "4. Physical Properties" (PDF). High-precision photometry by telescope defocussing. VIII. WASP-22, WASP-41, WASP-41 and WASP-55. pp. 4210. doi:10.1093/mnras/stw279. https://academic.oup.com/mnras/article-pdf/457/4/4205/18755584/stw279.pdf. Retrieved 25 October 2023.
- ↑ Evans, D. F.; Southworth, J.; Smalley, B.; Jørgensen, U. G.; Dominik, M.; Andersen, M. I.; Bozza, V.; Bramich, D. M. et al. (2018), "High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). II. Lucky Imaging results from 2015 and 2016", Astronomy & Astrophysics 610: A20, doi:10.1051/0004-6361/201731855, Bibcode: 2018A&A...610A..20E
- ↑ Lendl, M.; Anderson, D. R.; Collier-Cameron, A.; Doyle, A. P.; Gillon, M.; Hellier, C.; Jehin, E.; Lister, T. A. et al. (2012), "WASP-42 b and WASP-49 b: two new transiting sub-Jupiters", Astronomy & Astrophysics 544: A72, doi:10.1051/0004-6361/201219585, Bibcode: 2012A&A...544A..72L
Coordinates: 
12h 51m 55.5580s, −42° 04′ 25.0949″
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