2005 HC4
Asteroid
2005 HC₄ is the asteroid with the smallest known perihelion of any known object orbiting the Sun. Its extreme orbital eccentricity brings it to within 0.071 AU of the Sun and takes it as far as 3.562 AU from the Sun. Wikipedia
Orbital period: 900 days
Discoverer: Lowell Observatory Near-Earth-Object Search
Discovered: April 30, 2005
Perihelion: 0.070657 AU (10.5701 Gm)