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42355 Typhon (/ˈtaɪfɒn/; prov. 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.

42355 Typhon
Hubble Space Telescope image of Typhon and its moon Echidna, taken in 2006
Discovery
Discovered byNEAT
Discovery date5 February 2002
Designations
MPC designation
(42355) Typhon
Pronunciation/ˈtaɪfɒn/[1]
Named after
Τυφών Typhōn
Alternative designations
2002 CR46
Minor planet category
SDO[2][3]
Centaur[4]
7:10 resonance
AdjectivesTyphonian /taɪˈfoʊniən/[5]
Orbital characteristics[2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 2
Observation arc9563 days (26.18 yr)
Aphelion58.982252 AU (8.8236193 Tm)
Perihelion17.545721 AU (2.6248025 Tm)
Semi-major axis
38.263987 AU (5.7242110 Tm)
Eccentricity0.5414560
Orbital period (sidereal)
236.70 yr (86453.7 d)
Mean anomaly
14.61898075°
Mean motion
0° 0m 14.991s / day
Inclination2.4252078°
Longitude of ascending node
351.9098598°
Argument of perihelion
159.3215723°
Known satellites1 (Echidna)
TJupiter4.692
Physical characteristics
Mean diameter
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]
Synodic rotation period
9.67 h (0.403 d)[6]
Geometric albedo
0.044±0.003[7]
0.10±0.02
Spectral type
B−V=0.74±0.02 V−R=0.52±0.01
Absolute magnitude (H)
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]


    Moon


    Echidna
    Discovery
    Discovery date2006
    Designations
    MPC designation
    		(42355) Typhon I Echidna
    Pronunciation/ɪˈkɪdnə/[10]
    Named after
    		Έχιδνα
    AdjectivesEchidnian[11]
    Echidnean (rarely)[12]
    (both /ɪˈkɪdniən/)[13]
    Orbital characteristics
    Semi-major axis
    		~1300 km
    Orbital period (sidereal)
    		11 d
    Satellite ofTyphon
    Physical characteristics
    Dimensions89±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


      1. "Typhon". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
      2. "JPL Small-Body Database Browser: (42355 Typhon)" (2008-03-14 last obs). Retrieved 12 April 2016.
      3. "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 2008-09-21.
      4. (42355) Typhon and Echidna
      5. "Typhonian". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
      6. Duffard, R.; Pinilla-Alonso, N.; Santos-Sanz, P.; Vilenius, E.; Ortiz, J. L.; Mueller, T.; et al. (April 2014). ""TNOs are Cool": A survey of the trans-Neptunian region. XI. A Herschel-PACS view of 16 Centaurs". Astronomy and Astrophysics. 564: 17. arXiv:1309.0946. Bibcode:2014A&A...564A..92D. doi:10.1051/0004-6361/201322377. S2CID 119177446.
      7. 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
      8. 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. S2CID 18927838.
      9. 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.
      10. "Echidna". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
      11. François Hartog (Janet Lloyd, trans., 1988) The Mirror of Herodotus, p. 25
      12. J. A. Weinstock (2014) The Ashgate Encyclopedia of Literary and Cinematic Monsters, p. 79
      13. George Sandys (1669) Ovid's Metamorphosis Englished, 6th ed., p. 134.



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      На других языках

      [de] (42355) Typhon

      (42355) Typhon ist ein Asteroid, der der Gruppe der Zentauren angehört. Am 15. Februar 2006 wurde die Entdeckung eines Mondes bekanntgegeben – es handelt sich hierbei um die erste Entdeckung eines Doppelsystems in der Klasse der Zentauren. Da Echidna etwa die Hälfte des Durchmessers von Typhon aufweist, kann dieses System auch als Doppelasteroidensystem verstanden werden.
      - [en] 42355 Typhon

      [ru] (42355) Тифон

      (42355) Тифон (42355 Typhon) — небольшой объект рассеянного диска, хотя также может быть классифицирован как кентавр.


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