page_title: WASP-19b
hierarchical_section_title: WASP-19b
caption_attribution_description: English: Comparison of best-fit size of the exoplanet WASP-19 b with the Solar System planet Jupiter, as reported in the Extrasolar Planets Encyclopaedia[1] as of 2010-10-03. ↑ Extrasolar Planets Encyclopaedia (2010-09-30). Retrieved on 2010-10-03.
context_page_description: 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, but by comparison has a much larger radius; making it nearly the size of a low-mass star. It orbits the star WASP-19 in the Vela constellation. At the time of discovery it was the shortest period hot Jupiter discovered as planets with shorter orbital periods had a rocky, or metallic composition.
  The study in 2012, utilizing a Rossiter–McLaughlin effect, have determined the planetary orbit is well aligned with the equatorial plane of the star, misalignment equal to -15±11°.
  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.
  In 2019 the planet was observed with TESS and the eclipse of the planet was measured. The broad variations caused by the changing aspect of the heated face of the planet were measured.
context_section_description: 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. It orbits the star WASP-19 in the Vela constellation. At the time of discovery it was the shortest period hot Jupiter discovered as planets with shorter orbital periods had a rocky, or metallic composition.
  The study in 2012, utilizing a Rossiter–McLaughlin effect, have determined the planetary orbit is well aligned with the equatorial plane of the star, misalignment equal to -15±11°.
  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.
  In 2019 the planet was observed with TESS and the eclipse of the planet was measured. The broad variations caused by the changing aspect of the heated face of the planet were measured. The study deduced that the dayside has a temperature of 2240 ± 40 K (1967 ± 40 °C) and that the planet reflects 16 ± 4 percent of the light that falls on it.The last value is relatively high compared to other planets.
caption: Size comparison of WASP-19b with Jupiter.
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