42355 Typhon
42355 Typhon is a scattered disc object that was discovered on February 5, 2002, by the NEAT program. It measures in diameter, and is named after Typhon, a monster in Greek mythology. Typhon is the first known binary centaur, using an extended definition of a centaur as an object on a non-resonant orbit with the perihelion inside the orbit of Neptune.
Symbol
s are no longer much used in astronomy, so Typhon never received a symbol in the astronomical literature. There is no standard symbol for Typhon used by astrologers either. A hurricane symbol has been used, which might be identified with.Physical properties
Measurements of its thermal radiation led to an equivalent diameter of about either or, with the latter value preferable. The diameter of the central body is in the latter case. Due to its small size, it is unlikely to be classified as a dwarf planet. As of 2021, no rotational lightcurve has been analyzed and the body's actual shape remain unknown.Typhon has a BR taxonomic class, with a blue surface. It has a resulting B–R color difference of about 1.3, while V–I color difference is about unity. The spectra of Typhon show the presence of water ice and possibly of water altered silicates.