, - style="vertical-align: top;" SWEEPS-10 is an extrasolar planet that, from June 2007 to August 2011, was the planet candidate with the shortest orbital period yet found, until PSR J1719-1438 b was discovered in 2011 with an even shorter orbit. The planet orbits the star SWEEPS J175902.00−291323.7 located in the Galactic bulge at a distance of approximately 22,000

light year A light-year, alternatively spelled light year, is a large unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (), or 5.88 trillion miles ().One trillion here is taken to be 1012 ...

s from Earth (based on a distance modulus of 14.1). It completes an orbit of its

star A star is an astronomical object comprising a luminous spheroid of plasma (physics), plasma held together by its gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked ...

(designated SWEEPS J175902.00−291323.7) in just 10 hours, and is categorized as an

ultra-short period planet An ultra-short period (USP) planet is a type of exoplanet with orbital period less than one day. At this short distance, tidal interactions lead to relatively rapid orbital and spin evolution. Therefore when there is a USP planet around a matur ...

(USPP). Located only 1.2 million kilometers from its star (roughly three times the distance between the Earth and the Moon), the planet is among the hottest ever detected; its estimated temperature is approximately 1,650 degrees

Celsius The degree Celsius is the unit of temperature on the Celsius scale (originally known as the centigrade scale outside Sweden), one of two temperature scales used in the International System of Units (SI), the other being the Kelvin scale. The ...

. "This star-hugging planet must be at least 1.6 times the mass of Jupiter, otherwise the star's gravitational muscle would pull the planet apart," said team leader Kailash Sahu of the Space Telescope Science Institute in

Baltimore, Maryland Baltimore ( , locally: or ) is the most populous city in the U.S. state of Maryland, fourth most populous city in the Mid-Atlantic, and the 30th most populous city in the United States with a population of 585,708 in 2020. Baltimore was ...

. Such USPPs seem to occur only around dwarf stars. The small star's relatively low temperature allows the planet to exist. "USPPs occur preferentially around normal

red dwarf ''Red Dwarf'' is a British science fiction comedy franchise created by Rob Grant and Doug Naylor, which primarily consists of a television sitcom that aired on BBC Two between 1988 and 1999, and on Dave since 2009, gaining a cult following. T ...

stars that are smaller and cooler than our Sun," Sahu said. File:Artist's impression of an ultra-short-period planet.jpg, Artist's impression of an ultra-short-period planet like SWEEPS-10.

References

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External links

SWEEPS-10 at ''exoplanet.eu''
Sagittarius (constellation) Exoplanet candidates Transiting exoplanets Hot Jupiters Giant planets Exoplanets discovered in 2006 Sagittarius Window Eclipsing Extrasolar Planet Search {{extrasolar-planet-stub

See also

References

External links