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Scattered disc object From Wikipedia, the free encyclopedia
42355 Typhon (/ˈtaɪfɒn/; 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.
![]() Hubble Space Telescope image of Typhon and its moon Echidna, taken in 2006 | |
Discovery | |
---|---|
Discovered by | NEAT |
Discovery date | 5 February 2002 |
Designations | |
(42355) Typhon | |
Pronunciation | /ˈtaɪfɒn/[1] |
Named after | Τυφών Typhōn |
2002 CR46 | |
SDO[2][3] Centaur[4] 7:10 resonance | |
Adjectives | Typhonian /taɪˈfoʊniən/[5] |
Orbital characteristics[2] | |
Epoch 13 January 2016 (JD 2457400.5) | |
Uncertainty parameter 2 | |
Observation arc | 9563 days (26.18 yr) |
Aphelion | 58.982252 AU (8.8236193 Tm) |
Perihelion | 17.545721 AU (2.6248025 Tm) |
38.263987 AU (5.7242110 Tm) | |
Eccentricity | 0.5414560 |
236.70 yr (86453.7 d) | |
14.61898075° | |
0° 0m 14.991s / day | |
Inclination | 2.4252078° |
351.9098598° | |
159.3215723° | |
Known satellites | 1 (Echidna) |
TJupiter | 4.692 |
Physical characteristics | |
138±9 km[6] 162±7 km[7] | |
Mass | ≈9.082×1017 kg[6] |
Mean density | 0.66+0.09 −0.08 g/cm3[6] |
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 | |
Typhon is the first known binary centaur,[8] using an extended definition of a centaur as an object on a non-resonant (unstable) orbit with the perihelion inside the orbit of Neptune.[9]
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.
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