42355 Typhon
| Discovery | |
|---|---|
| Discovered by | NEAT |
| Discovery date | February 5, 2002 |
| Designations | |
Named after | Typhon |
| 2002 CR46 | |
| Scattered disc[1][2] 7:10 resonance | |
| Adjectives | Typhonean, Typhonian |
| Orbital characteristics | |
| Aphelion | 58.799297 AU |
| Perihelion | 17.525714 AU |
| 38.162506 AU | |
| Eccentricity | 0.5407609 |
| 359.6998644° | |
| Inclination | 2.4280935° |
| 351.9923803° | |
| 159.0020803° | |
| Physical characteristics | |
| Dimensions | 162±7 km[4] 134±13 km[citation needed] |
| Albedo | 0.044±0.003[4] 0.10±0.02 |
Spectral type | B−V=0.74±0.02 V−R=0.52±0.01 |
| 7.65±0.01 | |
42355 Typhon (/ˈtaɪfɒn/; from Template:Lang-el) 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.
A large moon was identified in 2006. It is named Echidna—formal designation (42355) Typhon I Echidna, /[invalid input: 'ɨ']ˈkɪdnə/, from Template:Lang-el—after 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 89±6 km. Typhon is the first known binary centaur,[5] using an extended definition of a centaur as an object on a non-resonant (unstable) orbit with the perihelion inside the orbit of Neptune.[6]
References
- ^ "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; 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. Bibcode:2005AJ....129.1117E. doi:10.1086/427395.
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External links
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