817 Annika

Minor Planet | name=817 Annika
discoverer=Max Wolf
discovery_date=February 6, 1916
designations=1916 YW
category=Main belt (Eunomia family)
epoch=8 August, 2005 (JD 2453600.5)
semimajor=387.3 Gm (2.589 AU)
perihelion=317.9 Gm (2.125 AU)
aphelion=456.6 Gm (3.053 AU)
eccentricity=0.179
period=1521.586 d (4.20 a)
inclination=11.345°
asc_node=125.701°
arg_peri=284.937°
mean_anomaly=224.421°
speed=18.36 km/s
dimensions=22 km ^{[http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab]}
mass=~1.5×10¹⁶ kg "(estimate)"
density=~2.7 g/cm³ "(estimate)" ^{[#Krasinsky02| [3]}
gravity=~0.008 m/s² "(estimate)"
escape_velocity=~0.013 km/s "(estimate)"
rotation=0.440 d ^{[http://www.psi.edu/pds/archive/lc.html]}
spectral_class=S-type asteroid
abs_mag=10.80
albedo=0.174
temperature=~169 K
"max:" 264K (-9° C)

817 Annika is a minor planet or Main belt asteroid of the Eunomia family which orbits the Sun.

References

#

[http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab Supplemental IRAS Minor Planet Survey]

# [http://www.psi.edu/pds/archive/lc.html PDS lightcurve data]
#

G. A. Krasinsky et al "Hidden Mass in the Asteroid Belt", Icarus, Vol. 158, p. 98 (2002).

External links

* [http://cfa-www.harvard.edu/iau/lists/NumberedMPs.txt Discovery Circumstances: Numbered Minor Planets]