Question: 5786 Talos (1991 RC) is an Apollo asteroid discovered on September 3, 1991, by R. H. McNaught at Siding Spring, it has a very small perihelion distance; only two other named asteroids have one less than 0.2 AU, 1566 Icarus and 3200 Phaethon, 3200 Phaethon, provisional designation 1983 TB , is an Apollo asteroid with an unusual orbit that brings it closer to what, than any other named asteroid?

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3200 Phaethon: 3200 Phaethon ( , sometimes incorrectly spelled Phaeton), provisional designation 1983 TB , is an Apollo asteroid with an unusual orbit that brings it closer to the Sun than any other named asteroid (though there are several unnamed asteroids, including three numbered ones, with smaller perihelia, e.g. ).  For this reason, it was named after the Greek myth of Phaëton, son of the sun god Helios.  It is 5.1 ± in mean diameter.

Simon F. Green: Simon F. Green is an astronomer.  He is a Senior Lecturer in Planetary and Space Science at the Open University.  He specializes in the study of asteroids and trans-Neptunian objects, and for a long time worked with the IRAS satellite to detect fast moving objects.  In 1983, along with John K. Davies, he discovered the Apollo asteroid 3200 Phaethon.

1566 Icarus: 1566 Icarus ( ), provisional designation 1949 MA, is an extremely eccentric asteroid, approximately 1.4 kilometers in diameter.  It is a near-Earth object of the Apollo group and the lowest numbered potentially hazardous asteroid.  In 1968, it became the first asteroid ever observed by radar.  Its orbit brings it closer to the Sun than Mercury and further out than the orbit of Mars, which also makes it a Mercury-, Venus-, and Mars-crosser.  This stony asteroid and relatively fast rotator was discovered by German astronomer Walter Baade at the Palomar Observatory, California, on 27 June 1949.  It was named after the mythological boy Icarus, who flew too close to the Sun.

5380 Sprigg: 5380 Sprigg, provisional designation 1991 JT, is an asteroid from the middle regions of the asteroid belt, approximately 7 kilometers in diameter.  It was discovered on 7 May 1991, by Australian astronomer Robert McNaught at Siding Spring Observatory in New South Wales, Australia.  It was named after Australian geologist Reg Sprigg.

(66391) 1999 KW4: (66391) 1999 KW , provisional designation 1999 KW, is a binary asteroid, classified as near-Earth object and potentially hazardous asteroid of the Aten group, approximately 1.3 kilometers in diameter.  It was discovered on 20 May 1999, by Lincoln Near-Earth Asteroid Research (LINEAR) at the Lincoln Laboratory's Experimental Test Site in Socorro, New Mexico, United States.  It is also a Mercury-crosser and the closest known binary system to the Sun with a perihelion of just 0.2 AU.

2014 RC: 2014 RC is a sub-kilometer asteroid and fastest known rotator, classified as near-Earth object of the Apollo group that made a close approach to Earth of 0.000267 AU (0.1 lunar distances) around 18:02 UTC on 7 September 2014.  The asteroid briefly brightened to about apparent magnitude 11.5, so it was not visible to the naked eye or common binoculars.  At the peak brightness the asteroid had a declination of –47, and was most easily visible over New Zealand.  The asteroid is approximately the diameter of the Chelyabinsk meteor, and passed almost as close to Earth as 367943 Duende (2012 DA14) did in 2013.  During 2014, asteroids 2014 AA and have come closer to Earth.  2014 RC was removed from the JPL Sentry Risk Table on 5 September 2014 and there are no known possible impact dates in the next 100 years.  On 8 September 2115 the asteroid will pass about 0.0053 AU from the moon.  On 5 September 1973, the asteroid passed between 0.01052 AU and 0.01207 AU from Earth.

5786 Talos: 5786 Talos (1991 RC) is an Apollo asteroid discovered on September 3, 1991, by R. H. McNaught at Siding Spring.  It has a very small perihelion distance; only two other named asteroids have one less than 0.2 AU, 1566 Icarus and 3200 Phaethon.

1999 CW8: 1999 CW is an Apollo asteroid and near-Earth object that is a B-type asteroid, relatively rare in the asteroid belt but common in the inner solar system.  The asteroid never approaches Earth closer than 0.2 AU, but occasionally makes close approaches to Mars of 0.07 AU.  It makes one such approach in 2073, at 0.067 AU, and another one in 2103, at 0.094 AU.  Due to 1999 CW's relatively high inclination, although it passes closer to the Sun than the Earth (0.9 AU), it never comes closer than 0.2 AU.

Main-belt comet: Main-belt comets (MBCs) are bodies orbiting within the asteroid belt that have shown comet-like activity during part of their orbit.  The Jet Propulsion Laboratory defines a main-belt asteroid as an asteroid with a semi-major axis (average distance from the Sun) of more than 2 AU but less than 3.2 AU, and a perihelion (closest approach distance to the Sun) of no less than 1.6 AU.  David Jewitt from UCLA points out that these objects are most likely not comets with sublimating ice, but asteroids that exhibit dust activity, and hence he and others started calling these class of objects active asteroids.

7604 Kridsadaporn: 7604 Kridsadaporn is a Mars-crossing asteroid discovered by R. H. McNaught on 31 August 1995 at Siding Spring Observatory near the town of Coonabarabran, Australia.  Kridsadaporn's high orbital eccentricity of just over 0.574 places it within a group of objects known as Asteroids in Cometary Orbit (ACOs).  Due to its unusual orbital parameters, Kridsadaporn is listed by the IAU Minor Planets Center as an Unusual Minor Planet.

Supporting paragraphs: 5786 Talos 3200 Phaethon
Answer: Sun