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JPL Small-Body Database Browser
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817 Annika (A916 CD)
Classification: Main-belt Asteroid          SPK-ID: 2000817
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1800869653075945 3.5066e-08  
a 2.589577692320181 8.0852e-09 au
q 2.123228504281996 9.012e-08 au
i 11.33522885280089 3.9945e-06 deg
node 125.4737067942558 2.0192e-05 deg
peri 285.2197014725673 2.3023e-05 deg
M 326.4478589364736 1.1875e-05 deg
tp 2458742.359878309789
(2019-Sep-15.85987831)
5.0445e-05 TDB
period 1522.095299218934
4.17
7.1284e-06
1.952e-08
d
yr
n .2365160710927461 1.1077e-09 deg/d
Q 3.055926880358366 9.5412e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2520  
   data-arc span      37925 days (103.83 yr)  
   first obs. used      1916-02-06  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42046  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:49:10  

Additional Information
 Earth MOID = 1.16682 au 
 Jupiter MOID = 2.37398 au 
 T_jup = 3.370 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.6   n/a MPO263351  
diameter diameter 22.891 km 0.100 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 10.56 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Bembrick, C.; Bolt, G.; Richards, T. (2003) Minor Planet Bull. 30, 20-21.]
[Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.187   0.025 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

817 Annika (A916 CD)          Discovered 1916-Feb-06 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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