14827 Hypnos

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14827 Hypnos
Discovery
U–B = 0.492[1]
18.3[1] · 18.65±0.22[4] · 18.94[6][7]

14827 Hypnos (

potentially hazardous asteroid of the Apollo group
.

The asteroid was discovered by American astronomer couple

Eugene Shoemaker at the Palomar Observatory in California on 5 May 1986.[3] It was named after Hypnos, the Greek god of sleep.[2]

Orbit and classification

Comet-like orbit of Hypnos with a high eccentricity of 0.67

Hypnos orbits the Sun at a distance of 0.9–4.7 AU once every 4 years and 9 months (1,749 days). Its orbit has a high eccentricity of 0.67 and an inclination of 2° with respect to the ecliptic.[1] It is frequently perturbed by Jupiter.[8]

The body's observation arc begins at Anderson Mesa Station the night prior to its official discovery observation at Palomar.[3]

Close approaches

As a

lunar distances.[1]

In 1958, Hypnos passed less than 0.03 AU from both Earth and Mars.

Mars-crosser
.

Extinct comet

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.[10]

Physical characteristics

Hypnos is an assumed carbonaceous C-type asteroid.[6][5]

Lightcurves

As of 2018, no rotational

spheroidal shape.[7]

Diameter and albedo

According to the NEOSurvey carried out by NASA's

albedo of 0.22 based on an absolute magnitude of 18.65,[4] while infrared radiometry gave a radar albedo of no more than 0.067 and a diameter of at least 740 meters.[5]

The Collaborative Asteroid Lightcurve Link assumes a standard optical albedo for carbonaceous asteroids 0.057 and derives a diameter of 907 meters with an absolute magnitude of 18.94.[6] The diameter agrees with Tom Gehrels 1994-publication Hazards due to Comets and Asteroids in which he estimated a mean-diameter of 900 meters for Hypnos.[1]

Naming

This

M.P.C. 47301).[11]

Exploration

Hypnos is a target for the LICIACube mission.[12]

References

  1. ^ a b c d e f g h i j "JPL Small-Body Database Browser: 14827 Hypnos (1986 JK)" (2005-08-30 last obs.). Jet Propulsion Laboratory. Retrieved 12 September 2017.
  2. ^
    ISBN 978-3-540-34361-5
    .
  3. ^ a b c "14827 Hypnos (1986 JK)". Minor Planet Center. Retrieved 12 September 2017.
  4. ^
    doi:10.3847/0004-6256/152/6/172
    .
  5. ^ a b c d e Lance Benner (3 April 2012). "NEA Radar Albedo Ranking". Asteroid Radar Research. Archived from the original on 6 October 2000. Retrieved 12 September 2017.
  6. ^ a b c d e f g "LCDB Data for (14827) Hypnos". Asteroid Lightcurve Database (LCDB). Retrieved 12 September 2017.
  7. ^
    ISSN 0019-1035
    . Retrieved 12 September 2017.
  8. ^ "JPL Close-Approach Data: 14827 Hypnos (1986 JK)" (last observation: 2000-10-25). Retrieved 6 May 2009.
  9. ^ "NEODys (14827) Hypnos". Department of Mathematics, University of Pisa. Retrieved 12 September 2017.
  10. S2CID 14026673
    . Retrieved 12 September 2017.
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 12 September 2017.
  12. ^ https://twitter.com/LICIACube/status/1585556947595661313/photo/1

External links

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