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SWEEPS J175902.00−291323.7
Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
Right ascension 17h 59m 02.00s
Declination -29° 13' 23.7"'
Apparent magnitude (V) 26.23
Distance 22,000 ly
(6,600 pc)
Mass 0.44 M
Radius 0.41 R
Database references
Exoplanet List of exoplanets
Orbital elements
Semi-major axis (a) 0.008 AU
Orbital period (P) 0.424 d
Inclination (i) >84°
Physical characteristics
Mass (m) >1.6 MJ
Radius (r) 1.24±0.23 RJ
Discovery information
Discovery date October 4, 2006
Discoverer(s) Jeremy McGovern
Discovery method Transit
Discovery status Unconfirmed

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 years from Earth (based on a distance modulus of 14.1).

It completes an orbit of its star (designated SWEEPS J175902.00−291323.7) in just 10 hours, and is categorized as an ultra-short period planet (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. "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. 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 stars that are smaller and cooler than our Sun," Sahu said.[1]

See also[edit]


  1. ^ McGovern, Jeremy (October 4, 2006). "Hubble's SWEEPS 10". Astronomy Magazine. Retrieved 2016-02-24. 

External links[edit]