14827 Hypnos

Infobox Planet
minorplanet = yes
width = 25em
bgcolour = #FFFFC0
name = 14827 Hypnos
symbol =


caption =
discovery = yes
discovery_ref =
discoverer = Carolyn S. Shoemaker
Eugene Merle Shoemaker
discovered = May 5 1986
designations = yes
mp_name = 14827 Hypnos
alt_names = 1986 JK
mp_category = Apollo asteroid
orbit_ref = cite web |title=JPL Small-Body Database Browser: 14827 Hypnos (1986 JK) |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Hypnos |accessdate=2008-02-08]
epoch = October 27, 2007
aphelion = 4.738 AU (Q)
perihelion = 0.9536 AU (q)
semimajor = 2.846 AU (a)
eccentricity = 0.6648
period = 4.80 a
avg_speed =
inclination = 1.981°
asc_node = 58.07°
mean_anomaly = 186.4° (M)
arg_peri = 238.0°
satellites =
physical_characteristics = yes
dimensions = 0.9 - 1.2cite web
title=14827 Hypnos
publisher=The Near-Earth Asteroids Data Base at E.A.R.N
url=http://earn.dlr.de/nea/014827.htm
accessdate=2008-02-08] km
mass =
density =
surface_grav =
escape_velocity =
sidereal_day =
axial_tilt =
pole_ecliptic_lat =
pole_ecliptic_lon =
albedo = <0.067cite web
date=2007 May 04
title=NEA RADAR ALBEDO RANKING
publisher=Asteroid Radar Research
url=http://echo.jpl.nasa.gov/~lance/asteroid_radar_properties/nea.radaralbedo.html
accessdate=2008-02-08]
spectral_type =
abs_magnitude = 18.3

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.cite journal |first=Kathryn |last=Whitman |coauthors=Alessandro Morbidelli and Robert Jedicke
title=The Size-Frequency Distribution of Dormant Jupiter Family Comets
year=2006
url=http://arxiv.org/abs/astro-ph/0603106v2
accessdate=2008-02-08]

In 1958, Hypnos passed less than 0.03 AU from both Earth and Mars.cite web
title=NEODys (14827) Hypnos
publisher=Department of Mathematics, University of Pisa, ITALY
url=http://newton.dm.unipi.it/cgi-bin/neodys/neoibo?objects:Hypnos;main
accessdate=2008-02-08] . Neither planet has been approached so closely by Hypnos since the 862 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.

References

External links

*JPL Small Body