42355 Typhon
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42355 Typhon
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Discovery
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| Discovered by | NEAT |
| Discovery date | February 5, 2002 |
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Designations
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| Named after | Typhon |
| Alternate name(s) | 2002 CR46 |
| Minor planet category |
Scattered disc[1][2] Centaur[3] |
| Adjective | Typhonean, Typhonian |
| Aphelion | 58.799297 AU |
| Perihelion | 17.525714 AU |
| Semi-major axis | 38.162506 AU |
| Eccentricity | 0.5407609 |
| Mean anomaly | 359.6998644° |
| Inclination | 2.4280935° |
| Longitude of ascending node | 351.9923803° |
| Argument of perihelion | 159.0020803° |
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Physical characteristics
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| Dimensions | 185±7 km[4] 134±13 km |
| Albedo | 0.044±0.003[4] 0.10±0.02 |
| Spectral type | B-V=0.74±0.02 V-R=0.52±0.01 |
| Absolute magnitude (H) | 7.65±0.01 |
42355 Typhon (
/ˈtaɪfɒn/; from Greek: Τυφών) is a 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.
A large moon was identified in 2006. It is named Echidna—formal designation (42355) Typhon I Echidna, /ɨˈkɪdnə/, from Greek: Έχιδνα—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 78±8 km. Typhon is considered 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. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=42355. Retrieved 2008-09-21.
- ^ "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. http://www.minorplanetcenter.org/iau/lists/Centaurs.html. 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. http://occult.mit.edu/_assets/documents/publications/Elliot2005AJ129.1117.pdf.
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