WASP-4b

WASP-4b
Exoplanet List of exoplanets

Size comparison of WASP-4b with Jupiter.
Parent star
Star WASP-4
Constellation Phoenix
Right ascension (α) 23h 34m 15.0858s[1]
Declination (δ) −42° 03′ 41.0495″[1]
Apparent magnitude (mV) 12.468±0.025[2]
Distance880±10[1] ly
(269±4[1] pc)
Spectral type G7V[3]
Orbital elements
Semi-major axis(a) 0.02255+0.00095
−0.00065[4] AU
Eccentricity (e) 0.0[4]
Orbital period(P) 1.3382324+0.0000017
−0.0000029[4] d
Inclination (i) 89.35+0.64
−0.49[4]°
Time of transit (Tt) 2454383.313070+0.000045
−0.000074 HJD[4]
Semi-amplitude (K) 247.6+13.9
−6.8[4] m/s
Physical characteristics
Mass(m)1.21+0.13
−0.08[4] MJ
Radius(r)1.304+0.054
−0.042[4] RJ
Temperature (T) 1650 ± 30[4]
Discovery information
Discovery date October 31, 2007[5]
Discoverer(s) David. M. Wilson et al. (SuperWASP)[3]
Discovery method Transit
Discovery site SAAO
Discovery status Published[3]
Database references
Extrasolar Planets
Encyclopaedia		data
SIMBADdata
Exoplanet Archivedata
Open Exoplanet Cataloguedata

WASP-4b is an extrasolar planet approximately 880 light-years away in the constellation of Phoenix.[1][3] The planet was discovered orbiting the star WASP-4 in October 2007. The planet's mass and radius indicate that it is a gas giant, similar to Jupiter.[6] WASP-4b is close enough to its star to be classified as a hot Jupiter and has an atmospheric temperature of approximately 1650 K.[3][4]

The radial velocity trend of WASP-4, caused by the presence of WASP-4 b.

The planet was the discovered by the SuperWASP project using cameras in South Africa.[6] After its discovery, the mass of the WASP-4 b was determined by measuring the radial velocity of WASP-4, which confirmed that the object that caused the transit was a planet.[3]

References

  1. 1 2 3 4 5 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ↑ Henden, A. A.; et al. (2016). "VizieR Online Data Catalog: AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)". VizieR On-line Data Catalog: II/336. Originally published in: 2015AAS...22533616H. 2336. Bibcode:2016yCat.2336....0H. Vizier catalog entry
  3. 1 2 3 4 5 6 Wilson, D. M.; et al. (2008). "WASP-4b: A 12th Magnitude Transiting Hot Jupiter in the Southern Hemisphere". The Astrophysical Journal Letters. 675 (2): L113–L116. arXiv:0801.1509. Bibcode:2008ApJ...675L.113W. doi:10.1086/586735.
  4. 1 2 3 4 5 6 7 8 9 10 Table 3, Improved parameters for the transiting hot Jupiters WASP-4b and WASP-5b, M. Gillon et al., Astronomy and Astrophysics 496, #1 (2009), pp. 259–267, doi:10.1051/0004-6361:200810929, Bibcode: 2009A&A...496..259G.
  5. ↑ "Astronomer discovers new planets". BBC News. 2007-10-31. Retrieved 2018-09-23.
  6. 1 2 Sherriff, Lucy (2007-10-31). "UK boffins ID three new exo-planets". The Register. Retrieved 2018-09-23.

Media related to WASP-4b at Wikimedia Commons

  • "SuperWASP Homepage". Archived from the original on 2002-12-08. Retrieved 2008-07-02.
  • "UK planet hunters announce three new finds" (PDF). 2007-10-30. Archived from the original (PDF) on 2008-05-16. Retrieved 2008-07-02.

Coordinates: 23h 34m 15.06s, −42° 03′ 41.1″


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