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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
−0.016
,[6] making it, with its absolute magnitude (H) of 4.8,[4] 600+140
−130
 km
in diameter.[6] It is named after the primeval state of existence in Greek mythology, from which the first gods appeared.

19521 Chaos
Chaos-orbit-2019.png
The orbit of 19521 Chaos (white) compared Pluto and the four giant planets: Jupiter, Saturn, Uranus and Neptune with positions for 2019.
Discovery
Discovered byDeep Ecliptic Srvy.
Discovery date19 November 1998
Designations
MPC designation(19521) Chaos
Pronunciation/ˈk.ɒs/
Named after
Chaos
1998 WH24
TNO (cubewano)[1][2]
AdjectivesChaotian
Orbital characteristics[4]
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)
Eccentricity0.10567
309.92 yr (113199 d)
4.3931 km/s
337.2998°
0° 0m 11.449s / day
Inclination12.0502°
50.0239°
58.4097°
Jupiter MOID35.8 AU (5.36 Tm)
Neptune MOID12.5 AU (1.87 Tm)[3]
TJupiter5.884
Physical characteristics
Dimensions615[5]
600+140
−130
 km
[6]
3.985 d
0.050+0.030
−0.016
[6]
4.8[4]
5.0 [5]

Contents

OrbitEdit

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).[3]

 
Chaos moves west to east (right to left) across the sky, discovered in Taurus in 1998, and precovered back to 1991.
 
Chaos is a classical nonresonant Kuiper belt object
 
Distance from earth (AU)
 
Apparent magnitude from earth
Chaos is at perihelion around 2035, coming as close as 40 AUs from the earth. It's brightest magnitude will be 20.8.

Physical characteristicsEdit

Chaos is a dark object, with an albedo estimated at 5%, implying a diameter of 600 km. Its rotation rate is slow at 3.985 days. According to Brown, it is a likely dwarf planet.[5]

Size comparison between Pluto and Chaos

ReferencesEdit

  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 "(19521) Chaos = 1998 WH24 Orbit". IAU Minor Planet Center. Retrieved 2018-02-10.
  4. ^ a b c "JPL Small-Body Database Browser: 19521 Chaos (1998 WH24)" (2007-12-14 last obs). Retrieved 11 April 2016.
  5. ^ a b c Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. Retrieved 25 Dec 2018.
  6. ^ 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

External linksEdit