WASP-42

Coordinates: Sky map 12h 51m 55.5580s, −42° 04′ 25.0949″
Source: Wikipedia, the free encyclopedia.
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]
Distance
580 ± 2 ly
(177.9 ± 0.5 pc)
Details
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]

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]

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

  1. ^ a b c "WASP-42". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-12-22.
  2. ^
    S2CID 44864064
  3. ^
    doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR
    .
  4. ^
    S2CID 118923163
  5. S2CID 118750676
  6. doi:10.1093/mnras/stw279
    . Retrieved 25 October 2023.
  7. S2CID 53400492
  8. S2CID 54186638



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