19521 Chaos

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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]

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.

Orbit[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).[3]

Chaos-sky-2019.png
Chaos moves west to east (right to left) across the sky, discovered in Taurus in 1998, and precovered back to 1991.
Chaos-qe chart.png
Chaos is a classical nonresonant Kuiper belt object
Chaos-distance from earth.png
Distance from earth (AU)
Chaos-magnitude.png
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 characteristics[edit]

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

References[edit]

  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 links[edit]