817 Annika

817 Annika
Discovery [1]
Discovered byM. F. Wolf
Discovery siteHeidelberg Obs.
Discovery date6 February 1916
Designations
(817) Annika
Pronunciation/ˈænɪkə/ German: [ˈanikaː][2]
Named after
unknown [3]
A916 · CD 1916 YW
Orbital characteristics [4]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc103.99 yr (37,982 d)
Aphelion3.0570 AU
Perihelion2.1231 AU
2.5900 AU
Eccentricity0.1803
4.17 yr (1,523 d)
61.065°
0° 14m 11.4s / day
Inclination11.336°
125.47°
285.18°
Physical characteristics
Dimensions22.0 km × 22.0 km
Mean density
~2.7 g/cm3 (estimate)[13]

817 Annika (prov. designation: A916 CD or 1916 YW) is a background asteroid in the region of the Eunomia family, located in the central portion of the asteroid belt. It was discovered on 6 February 1916, by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory in southwest Germany.[1] The stony S-type asteroid (Sl) has a rotation period of 10.56 hours and measures approximately 23 kilometers (14 miles) in diameter. Any reference of the asteroid's name to a person is unknown.[3]

  1. ^ a b c d Cite error: The named reference MPC-object was invoked but never defined (see the help page).
  2. ^ (German Names)
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  10. ^ a b c Cite error: The named reference Mainzer-2016 was invoked but never defined (see the help page).
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  12. ^ a b c Cite error: The named reference AKARI was invoked but never defined (see the help page).
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  16. ^ a b Cite error: The named reference Lazzaro-2004 was invoked but never defined (see the help page).