42355 Typhon
Synodic rotation period | 9.67 h (0.403 d)[6] | |
| 0.044±0.003[7] 0.10±0.02 | ||
| B−V=0.74±0.02 V−R=0.52±0.01 | ||
| 7.5 | ||
42355 Typhon (provisional designation 2002 CR46) is a scattered disc object that was discovered on February 5, 2002, by the NEAT program. It measures 162±7 km in diameter, and is named after Typhon, a monster in Greek mythology.
Typhon is the first known binary
centaur as an object on a non-resonant (unstable) orbit with the perihelion inside the orbit of Neptune.[9]
Moon
| Discovery | |
|---|---|
| Discovery date | 2006 |
| Designations | |
| (42355) Typhon I Echidna | |
| Pronunciation | /ɪˈkɪdnə/[10] |
Named after | Έχιδνα |
| Adjectives | Echidnian[11] Echidnean (rarely)[12] (both /ɪˈkɪdniən/)[13] |
| Orbital characteristics | |
| ~1300 km | |
| 11 d | |
| Satellite of | Typhon |
| Physical characteristics | |
| Dimensions | 89±6 km |
A large
moon was identified in 2006. It is named Echidna (formal designation (42355) Typhon I Echidna), after the monstrous mate of Typhon
. It orbits Typhon at ~1300 km, completing one orbit in about 11 days. Its diameter is estimated to be 89±6 km.
References
- ^ "Typhon". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- ^ a b "JPL Small-Body Database Browser: (42355 Typhon)" (2008-03-14 last obs). Retrieved 12 April 2016.
- ^ "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 2008-09-21.
- ^ (42355) Typhon and Echidna
- ^ "Typhonian". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- ^ S2CID 119177446.
- ^ 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. S2CID 18927838.
- ^
J. L. Elliot; S. D. Kern; K. B. Clancy; A. A. S. Gulbis; R. L. Millis; M. W. Buie; et al. (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. doi:10.1086/427395.
- ^ "Echidna". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- ^ François Hartog (Janet Lloyd, trans., 1988) The Mirror of Herodotus, p. 25
- ^ J. A. Weinstock (2014) The Ashgate Encyclopedia of Literary and Cinematic Monsters, p. 79
- ^ George Sandys (1669) Ovid's Metamorphosis Englished, 6th ed., p. 134.
External links
