WASP-121
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Puppis[1] |
| Right ascension | 07h 10m 214.0s[2] |
| Declination | −39° 05′ 51″[2] |
| Apparent magnitude (V) | 10.4 |
| Characteristics | |
| Spectral type | F6V[2][3] |
| Apparent magnitude (B) | 11.00[4] |
| Apparent magnitude (V) | 10.51[4] |
| Apparent magnitude (J) | 9.625[4] |
| Apparent magnitude (H) | 9.439[4] |
| Apparent magnitude (K) | 9.374 [4] |
| Astrometry | |
| Proper motion (μ) | RA: -2.993[4] mas/yr Dec.: 25.086[4] mas/yr |
| Parallax (π) | 3.82 mas |
| Distance | 880 ly (270 pc) |
| Details | |
| Mass | 1.353[2] M☉ |
| Radius | 1.458[2] R☉ |
| Temperature | 6460.0[2] K |
| Metallicity | 0.13[2] |
| Other designations | |
TYC 7630-352-1, Gaia 5565050251402363648, 2MASS J07102406-3905506, 1SWASP J071024.05-390550.5[4] | |
| Database references | |
| SIMBAD | data |
WASP-121 is a magnitude 10.4 star located approximately 880 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.[2] 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).[5][6]
Planetary system
In 2015, the extrasolar planet WASP-121b was discovered orbiting WASP-121 by the transit method.[2] 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.[3][5] The exoplanet orbits WASP-121, its host star, every 1.27 days.[3][5] Hot water molecules, and evidence for the presence of titanium(II) oxide (TiO) and vanadium(II) oxide (VO), have been found in the stratosphere of WASP-121b.[2][5][6]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.184[2][3] MJ | 0.02544[2] | 1.275[2] | 0.0[2] | 87.6[2]° | 1.81[3] RJ |
Gallery
See also
References
- ^ a b Staff. "Finding the constellation which contains given sky coordinates". djm.cc. Retrieved 3 August 2017.
- ^ a b c d e f g h i j k l m n o Staff (2015). "Planet WASP-121 b". exoplanet.eu. Retrieved 3 August 2017.
- ^ a b c d e Staff (2017). "WASP Planets". wasp-planets.net. Retrieved 3 August 2017.
- ^ a b c d e f g h "SIMBAD query result: WASP-12 – Star". Centre de Données astronomiques de Strasbourg. 4 August 2017. Retrieved 3 August 2017.
- ^ a b c d Landau, Elizabeth; Villard, Ray (2 August 2017). "Hubble Detects Exoplanet with Glowing Water Atmosphere". NASA. Retrieved 2 August 2017.
- ^ a b Evans, Thomas M.; et al. (2 August 2017). "An ultrahot gas-giant exoplanet with a stratosphere". Nature. 548: 58–61. doi:10.1038/nature23266. Retrieved 2 August 2017.
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External links
Media related to WASP-121 at Wikimedia Commons
