817 Annika

**817 Annika**
Discovery ^A

Discoverer	Max Wolf
Discovery date	February 6, 1916
Alternate designations ^B	1916 YW
Category	Main belt (Eunomia family)
Orbital elements ^C
Epoch 8 August 2005 (JD 2453600.5)
Eccentricity (e)	0.179
Semi-major axis (a)	387.3 G m (2.589 AU)
Perihelion (q)	317.9 Gm (2.125 AU)
Aphelion (Q)	456.6 Gm (3.053 AU)
Orbital period (P)	1521.586 d (4.20 a)
Mean orbital speed	18.36 km/s
Inclination (i)	11.345°
Longitude of the ascending node (Ω)	125.701°
Argument of perihelion (ω)	284.937°
Mean anomaly (M)	224.421°
Physical characteristics ^D
Dimensions	22 km^[1]
Mass	~1.5×10¹⁶ kg (estimate)
Density	~2.7 g/cm³ (estimate)^[3]
Surface gravity	~0.008 m/s² (estimate)
Escape velocity	~0.013 km/s (estimate)
Rotation period	0.440 d ^[2]
Spectral class	S-type asteroid
Absolute magnitude	10.80
Albedo (geometric)	0.174
Mean surface temperature	~169 K max: 264K (-9° C)
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817 Annika is a minor planet orbiting the Sun.

References

Supplemental IRAS Minor Planet Survey
PDS lightcurve data
G. A. Krasinsky et al Hidden Mass in the Asteroid Belt, Icarus, Vol. 158, p. 98 (2002).

This article about an S-type asteroid native to the Main Belt is a stub. You can help Wikipedia by expanding it.

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