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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1803967080126001 3.4535e-08  
a 2.589742221327521 7.4426e-09 au
q 2.122561249998798 8.835e-08 au
i 11.3359670744462 3.7218e-06 deg
node 125.4699641302301 1.8867e-05 deg
peri 285.1386136928959 2.1391e-05 deg
M 108.3913225614556 1.0794e-05 deg
tp 2458742.173205543448
(2019-Sep-15.67320554)
4.5009e-05 TDB
period 1522.240361176592
4.17
6.5621e-06
1.797e-08
d
yr
n .2364935322840498 1.0195e-09 deg/d
Q 3.056923192656245 8.7852e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3043  
   data-arc span      38398 days (105.13 yr)  
   first obs. used      1916-02-06  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39298  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 18:54:55  

Additional Information
 Earth MOID = 1.16583 au 
 Jupiter MOID = 2.37442 au 
 T_jup = 3.370 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.69   n/a MPCxxxxx  
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. 2020-October); 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
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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