WASP-121

WASP-121 is a magnitude 10.4 star located approximately 850 light-years away in the constellation Puppis.[1] WASP-121 has a mass and radius similar to the Sun. Its planet WASP-121b orbits around WASP-121 in about 1.27 days.[3] WASP-121b is the first exoplanet found to contain water in an extrasolar planetary stratosphere (i.e., an atmospheric layer in which temperatures increase as the altitude increases).[6][7]

WASP-121
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Puppis[1]
Right ascension  07h 10m 24.0595s[2]
Declination −39° 05′ 50.562″[2]
Apparent magnitude (V) 10.4
Characteristics
Spectral type F6V[3][4]
Apparent magnitude (B) 11.00[5]
Apparent magnitude (V) 10.51[5]
Apparent magnitude (J) 9.625[5]
Apparent magnitude (H) 9.439[5]
Apparent magnitude (K) 9.374 [5]
Astrometry
Proper motion (μ) RA: −2.993±1.007[2] mas/yr
Dec.: 25.086±0.918[2] mas/yr
Parallax (π)3.82 ± 0.25[2] mas
Distance850 ± 60 ly
(260 ± 20 pc)
Details
Mass1.353[3] M☉
Radius1.458[3] R☉
Temperature6460.0[3] K
Metallicity0.13[3]
Other designations
TYC 7630-352-1, Gaia 5565050251402363648, 2MASS J07102406-3905506, 1SWASP J071024.05-390550.5[5]
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

Planetary system
WASP-121b - computer simulated views (August 2018)

In 2015, the extrasolar planet WASP-121b was discovered orbiting WASP-121 by the transit method.[3] WASP-121b is a "hot Jupiter" exoplanet with a mass about 1.18 times that of Jupiter and a radius about 1.81 times that of Jupiter.[4][6] The exoplanet orbits WASP-121, its host star, every 1.27 days.[4][6] Hot water molecules have been found in the stratosphere of WASP-121b.[3][6][7][8]

The WASP-121 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 1.184[3][4] MJ 0.02544[3] 1.275[3] 0.0[3] 87.6[3]° 1.81[4] RJ
An artist's impression of a hot Jupiter planet
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See also

References
  1. Staff. "Finding the constellation which contains given sky coordinates". djm.cc. Retrieved 3 August 2017.
  2. Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512.Gaia Data Release 1 catalog entry
  3. Staff (2015). "Planet WASP-121 b". exoplanet.eu. Retrieved 3 August 2017.
  4. Staff (2017). "WASP Planets". wasp-planets.net. Retrieved 3 August 2017.
  5. "WASP-12". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 3 August 2017.
  6. Landau, Elizabeth; Villard, Ray (2 August 2017). "Hubble Detects Exoplanet with Glowing Water Atmosphere". NASA. Retrieved 2 August 2017.
  7. Evans, Thomas M.; et al. (2 August 2017). "An ultrahot gas-giant exoplanet with a stratosphere". Nature. 548 (7665): 58–61. arXiv:1708.01076. Bibcode:2017Natur.548...58E. doi:10.1038/nature23266. PMID 28770846.
  8. Mikal-Evans, Thomas; Sing, David K.; Kataria, Tiffany; Wakeford, Hannah R.; Mayne, Nathan J.; Lewis, Nikole K.; Barstow, Joanna K.; Spake, Jessica J. (2020). "Confirmation of water emission in the dayside spectrum of the ultrahot Jupiter WASP-121b". arXiv:2005.09631 [astro-ph.EP].

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