817 Annika

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817 Annika
Discovery
Discovered by Max Wolf
Discovery date February 6, 1916
Designations
1916 YW
Minor planet category Main belt (Eunomia family)
Orbital characteristics
Epoch 8 August 2005 (JD 2453600.5)
Aphelion 456.6 Gm (3.053 AU)
Perihelion 317.9 Gm (2.125 AU)
387.3 Gm (2.589 AU)
Eccentricity 0.179
1521.586 d (4.20 a)
18.36 km/s
224.421°
Inclination 11.345°
125.701°
284.937°
Physical characteristics
Dimensions 22 km[1]
Mass ~1.5×1016 kg (estimate)
Mean density
~2.7 g/cm³ (estimate)[3]
~0.008 m/s² (estimate)
~0.013 km/s (estimate)
0.440 d [2]
Albedo 0.174
Temperature ~169 K
max: 264K (-9° C)
Spectral type
S-type asteroid
10.80

817 Annika is a mid-sized Eunomian asteroid.

References[edit]

  1. PDS lightcurve data
  2. G. A. Krasinsky et al. Hidden Mass in the Asteroid Belt, Icarus, Vol. 158, p. 98 (2002).

External links[edit]