19521 Chaos

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19521 Chaos
Discovered by Deep Ecliptic
Discovery date November 19, 1998
MPC designation 19521 Chaos
Pronunciation /ˈk.ɒs/
Named after
1998 WH24
TNO (cubewano)[1]
Adjectives Chaotian
Orbital characteristics[2]
Epoch January 30, 2005 (JD 2453400.5)
Aphelion 50.269 AU
Perihelion 40.929 AU
45.599 AU
Eccentricity 0.102
309.1006 yr
4.3931 km/s
Inclination 12.0550°
Physical characteristics
Dimensions 600+140
3.985 d
Albedo 0.050+0.030
4.8 [2]
5.0 [4]

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
,[3] making it, with its absolute magnitude (H) of 4.8,[2] 600+140
in diameter.[3] 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 not much more 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.

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.[5]


  1. ^ Marc W. Buie (2004-11-09). "Orbit Fit and Astrometric record for 19521". SwRI (Space Science Department). Retrieved 2008-09-28. 
  2. ^ a b c "JPL Small-Body Database Browser: 19521 Chaos (1998 WH24)" (2007-12-14 last obs). Retrieved 2010-03-13. 
  3. ^ 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
  4. ^ ""How many dwarf planets are there in the outer solar system?". Michael E. Brown. Retrieved 31 August 2015. 
  5. ^ http://www.quantumvibe.com/strip?page=1013

External links[edit]