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Exoplanet List of exoplanets
Exoplanet Comparison WASP-19 b.png
Size comparison of WASP-19b with Jupiter.
Parent star
Star WASP-19
Constellation Vela
Right ascension (α) 09h 53m 40.07s
Declination (δ) −45° 39′ 33.06″
Apparent magnitude (mV) 12.3
Distance 815 ly
(250[1] pc)
Spectral type G8V[2]
Mass (m) 0.95[2] M
Orbital elements
Semi-major axis (a) 0.01655±0.00013[2] AU
(2.45 Gm)
Periastron (q) 0.0161 AU
(2.41 Gm)
Apastron (Q) 0.0167 AU
(2.49 Gm)
Eccentricity (e) 0.0046+0.0044
Orbital period (P) 0.78884±0.0000003[1] d
    (18.93216 h)
Orbital speed (υ) 227 km/s
Inclination (i) 79.4±0.4[2]°
Time of transit (Tt) 2455168.96801±0.00009[2] JD
Physical characteristics
Mass (m) 1.168±0.023[2] MJ
Radius (r) 1.386±0.032[2] RJ
Density (ρ) 680[1] kg m−3
Geometric Albedo (Ag) <0.26 [3]
Temperature (T) 2009[1] K
Discovery information
Discovery date December 10, 2009[1]
Discoverer(s) Hebb et al. (SuperWASP)[1]
Discovery method Transit[1]
Other detection methods Radial velocity,
Secondary transit
Discovery status Published[1]
Database references
Extrasolar Planets
Exoplanet Archive data
Open Exoplanet Catalogue data

WASP-19b is an extrasolar planet, notable for possessing one of the shortest orbital periods of any known planetary body: 0.7888399 days or approximately 18.932 hours. It has a mass close to that of Jupiter (1.15 Jupiter masses), but by comparison has a much larger radius (1.31 times that of Jupiter, or 0.13 Solar radii); making it nearly the size of a low-mass star.[1] It orbits the star WASP-19 in the Vela constellation. It is currently the shortest period hot Jupiter discovered as planets with shorter orbital periods have a rocky, metallic or degenerate matter composition.

In 2013, secondary eclipse and orbital phases were barely observed from the data gathered with ASTEP telescope, making it the first detection of such kind through ground-based observations. This was possible due to large size of the planet and its small semi-major axis.[3]

On 3 December 2013, scientists working with the Hubble Space Telescope reported detecting water in the atmosphere of the exoplanet.[4][5]


  1. ^ a b c d e f g h i Hebb, L.; et al. (2010). "WASP-19b: The Shortest Period Transiting Exoplanet Yet Discovered". The Astrophysical Journal. 708 (1): 224–231. arXiv:1001.0403Freely accessible. Bibcode:2010ApJ...708..224H. doi:10.1088/0004-637X/708/1/224. 
  2. ^ a b c d e f g h "Notes for planet WASP-19b". The Extrasolar Planets Encyclopaedia. Retrieved 2009-12-10. 
  3. ^ a b http://arxiv.org/abs/1303.0973
  4. ^ Staff (3 December 2013). "Hubble Traces Subtle Signals of Water on Hazy Worlds". NASA. Retrieved 4 December 2013. 
  5. ^ Mandell, Avi M.; Haynes, Korey; Sinukoff, Evan; Madhusudhan, Nikku; Burrows, Adam; Deming, Drake (3 December 2013). "Exoplanet Transit Spectroscopy Using WFC3: WASP-12 b, WASP-17 b, and WASP-19 b". Astrophysical Journal. 779: 128. arXiv:1310.2949Freely accessible. Bibcode:2013ApJ...779..128M. doi:10.1088/0004-637X/779/2/128. Retrieved 4 December 2013. 

External links[edit]

Media related to WASP-19b at Wikimedia Commons

Coordinates: Sky map 09h 53m 40.07s, −45° 39′ 33.06″