19521 Chaos

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19521 Chaos
Discovered byDeep Ecliptic Srvy.
Discovery date19 November 1998
MPC designation(19521) Chaos
Named after
1998 WH24
TNO (cubewano)[1][2]
Orbital characteristics[3]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 3
Observation arc5902 days (16.16 yr)
Earliest precovery date17 October 1991
Aphelion50.636 AU (7.5750 Tm)
Perihelion40.957 AU (6.1271 Tm)
45.796 AU (6.8510 Tm)
309.92 yr (113199 d)
4.3931 km/s
0° 0m 11.449s / day
Jupiter MOID35.8 AU (5.36 Tm)
Neptune MOID12.5 AU (1.87 Tm)[4]
Physical characteristics
3.985 d
5.0 [6]

19521 Chaos /ˈk.ɒs/ is a cubewano, a Kuiper-belt object not in resonance with any planet. It is a likely dwarf planet. Chaos was discovered in 1998 by the Deep Ecliptic Survey with Kitt Peak's 4 m telescope. Its albedo is 0.050+0.030
,[5] making it, with its absolute magnitude (H) of 4.8,[3] 600+140
in diameter.[5] It is named after the primeval state of existence in Greek mythology, from which the first gods appeared.

Orbit and rotation[edit]

19521 Chaos has an orbital period of approximately 309 years. Its orbit is longer, but less eccentric than the orbit of Pluto. 19521 Chaos's orbit is inclined approximately 12° to the ecliptic. Its orbit never crosses the orbit of Neptune. Currently, the closest approach possible to Neptune (MOID) is 12.5 AU (1.87 billion km).[4]

Left: The orbit of 19521 Chaos (blue) compared to those of the four giant planets: Jupiter, Saturn, Uranus and Neptune (red). Right: 19521 Chaos's size compared to several other trans-Neptunian objects (TNOs) and to the Earth's Moon.

In fiction[edit]

In the online comic Quantum Vibe the lead characters hide on a secret base they have constructed on Chaos to perform experiments undetected.[7]


  1. ^ "MPEC 2008-O05 : Distant Minor Planets (2008 AUG. 2.0 TT)". Minor Planet Center. 17 July 2008. Retrieved 2011-01-08.
  2. ^ Marc W. Buie (2004-11-09). "Orbit Fit and Astrometric record for 19521". SwRI (Space Science Department). Retrieved 2008-09-28.
  3. ^ a b c "JPL Small-Body Database Browser: 19521 Chaos (1998 WH24)" (2007-12-14 last obs). Retrieved 11 April 2016.
  4. ^ a b "(19521) Chaos = 1998 WH24 Orbit". IAU Minor Planet Center. Retrieved 2018-02-10.
  5. ^ a b c d “TNOs are Cool”: A survey of the trans-Neptunian region VI. Herschel/PACS observations and thermal modeling of 19 classical Kuiper belt objects E. Vilenius, C. Kiss, M. Mommert, T. Müller, P. Santos-Sanz, A. Pal, J. Stansberry, M. Mueller, N. Peixinho, S. Fornasier, E. Lellouch, A. Delsanti, A. Thirouin, J. L. Ortiz, R. Duffard, D. Perna, N. Szalai, S. Protopapa, F. Henry, D. Hestroffer, M. Rengel, E. Dotto, & P. Hartogh
  6. ^ "How many dwarf planets are there in the outer solar system?". Michael E. Brown. Retrieved 15 September 2016.
  7. ^ http://www.quantumvibe.com/strip?page=1013

External links[edit]