14827 Hypnos

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14827 Hypnos
Discovery and designation
Discovered by Carolyn S. Shoemaker
Eugene Merle Shoemaker
Discovery date May 5, 1986
MPC designation 14827 Hypnos
Named after
1986 JK
Apollo asteroid
Orbital characteristics[1]
Epoch October 27, 2007
Aphelion 4.738 AU (Q)
Perihelion 0.9536 AU (q)
2.846 AU (a)
Eccentricity 0.6648
4.80 a
186.4° (M)
Inclination 1.981°
Physical characteristics
Dimensions 0.9[1] - 1.2[2] km

14827 Hypnos (also known by its provisional designation 1986 JK) is an Apollo near-Earth asteroid (NEA) discovered by Carolyn S. Shoemaker and Eugene Merle Shoemaker at Palomar Observatory on May 5, 1986. It is named after Hypnos, the Greek god of sleep.

Hypnos may be the nucleus of an extinct comet that is covered by a crust several centimeters thick that prevents any remaining volatiles from outgassing.[4] Hypnos is frequently perturbed by Jupiter.[5]

In 1958, Hypnos passed less than 0.03 AU from both Earth and Mars.[6] Neither planet has been approached so closely by Hypnos since the 862 AD pass of Earth, or will be until the 2214 pass of Earth.

It has a well determined orbit and has been observed 170 times since 1986.[1]

The eccentric (0.66) comet like orbit of Hypnos.


  1. ^ a b c d e "JPL Small-Body Database Browser: 14827 Hypnos (1986 JK)". Retrieved 2008-02-08. 
  2. ^ "14827 Hypnos". The Near-Earth Asteroids Data Base at E.A.R.N. Retrieved 2008-02-08. 
  3. ^ "NEA RADAR ALBEDO RANKING". Asteroid Radar Research. 2007-05-04. Archived from the original on 4 February 2008. Retrieved 2008-02-08. 
  4. ^ Whitman, Kathryn; Alessandro Morbidelli and Robert Jedicke (2006). "The Size-Frequency Distribution of Dormant Jupiter Family Comets". Icarus 183: 101–114. arXiv:astro-ph/0603106. Bibcode:2006Icar..183..101W. doi:10.1016/j.icarus.2006.02.016. 
  5. ^ "JPL Close-Approach Data: 14827 Hypnos (1986 JK)" (last observation: 2000-10-25). Retrieved 2009-05-06. 
  6. ^ "NEODys (14827) Hypnos". Department of Mathematics, University of Pisa, ITALY. Retrieved 2009-03-06. 

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