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20970 (1981 DD1)
Classification: Main-belt Asteroid          SPK-ID: 2020970
[ 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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .122086638139858 8.745e-08  
a 2.533631188610281 9.9836e-09 au
q 2.224308674506559 2.2467e-07 au
i 14.51688911735048 7.2959e-06 deg
node 332.0589925050069 1.0921e-05 deg
peri 126.9429921404089 8.5112e-05 deg
M 19.92815678839483 7.4499e-05 deg
tp 2459118.958602138151
(2020-Sep-26.45860214)		 0.000305 TDB
period 1473.036545324679
4.03		 8.7066e-06
2.384e-08		 d
yr
n .244393121910394 1.4445e-09 deg/d
Q 2.842953702714003 1.1202e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1355  
   data-arc span      14644 days (40.09 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46806  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:25  

Additional Information
 Earth MOID = 1.2698 au 
 Jupiter MOID = 2.29792 au 
 T_jup = 3.395 
[ 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 14.9   n/a MPO395204  

20970 (1981 DD1)          Discovered 1981-Feb-28 by Bus, S. J. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 DD1 = 1999 RE207 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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