42355 Typhon ( ; from / / Greek: ) is a Τυφών scattered disc object that was discovered on February 5, 2002, by the NEAT program. It measures 134±13 km in diameter, and is named after Typhon, a monster in Greek mythology.
moon was identified in 2006. It is named Echidna—formal designation (42355) Typhon I Echidna, , from / / Greek: —after Έχιδνα Echidna, the monstrous mate of Typhon. It orbits Typhon at ~1300 km, completing one orbit in about 11 days. Its diameter is estimated to be 78±8 km. Typhon is considered the first known binary centaur, using an extended definition of a [5 ] centaur as an object on a non-resonant (unstable) orbit with the perihelion inside the orbit of Neptune. [6 ]
References [ edit ]
^ "JPL Small-Body Database Browser: (42355 Typhon)". 2008-03-14 last obs . Retrieved 2008-09-21.
^ "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center . Retrieved 2008-09-21.
^ (42355) Typhon and Echidna
^ a b Santos-Sanz, P., Lellouch, E., Fornasier, S., Kiss, C., Pal, A., Müller, T. G., Vilenius, E., Stansberry, J., Mommert, M., Delsanti, A., Mueller, M., Peixinho, N., Henry, F., Ortiz, J. L., Thirouin, A., Protopapa, S., Duffard, R., Szalai, N., Lim, T., Ejeta, C., Hartogh, P., Harris, A. W., & Rengel, M. (2012). “TNOs are Cool”: A Survey of the Transneptunian Region IV - Size/albedo characterization of 15 scattered disk and detached objects observed with Herschel Space Observatory-PACS
^ K. Noll, H. Levison W. Grundy, D. Stephens (October 2006). "Discovery of a binary Centaur". Icarus 184 (2): 611. arXiv: astro-ph/0605606. Bibcode: 2006Icar..184..611N. doi: 10.1016/j.icarus.2006.05.010.
^ J. L. Elliot, S. D. Kern, K. B. Clancy, A. A. S. Gulbis, R. L. Millis, M. W. Buie, L. H. Wasserman, E. I. Chiang, A. B. Jordan, D. E. Trilling, and K. J. Meech (February 2005). "The Deep Ecliptic Survey: A Search for Kuiper Belt Objects and Centaurs. II. Dynamical Classification, the Kuiper Belt Plane, and the Core Population" (PDF). The Astronomical Journal 129 (2): 1117. Bibcode: 2005AJ....129.1117E. doi: 10.1086/427395.