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930 Westphalia (A920 EE)
Classification: Main-belt Asteroid          SPK-ID: 2000930
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 53 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1431592569414827 1.1985e-08  
a 2.43106337185282 6.1155e-09 au
q 2.083034145960715 2.7633e-08 au
i 15.3363053440879 1.0553e-06 deg
node 340.9409968932257 1.505e-06 deg
peri 330.0191522221212 3.7092e-06 deg
M 84.37609568890632 4.6056e-06 deg
tp 2458876.003683273201
(2020-Jan-27.50368327)
1.732e-05 TDB
period 1384.499639001509
3.79
5.2242e-06
1.43e-08
d
yr
n .2600217362711842 9.8115e-10 deg/d
Q 2.779092597744925 6.991e-09 au
  Orbit Determination Parameters
   # obs. used (total)      4107  
   data-arc span      36875 days (100.96 yr)  
   first obs. used      1920-03-19  
   last obs. used      2021-03-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .32121  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:38:57  

Additional Information
 Earth MOID = 1.08045 au 
 Jupiter MOID = 2.57859 au 
 T_jup = 3.445 
[ 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 11.31   n/a E2021B10  
diameter diameter 34.922 km 0.153 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 100.66 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Alvarez, E.M. (2015) Minor Planet Bull. 42, 212.]
geometric albedo albedo 0.032   0.001 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
SMASSII spectral type spec_B Ch   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

930 Westphalia (A920 EE)          Discovered 1920-Mar-10 by Baade, W. at Bergedorf
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A920 EE = A916 DD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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