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20511 (1999 RJ31)
Classification: Main-belt Asteroid          SPK-ID: 2020511
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0997456327129419 2.63e-08  
a 2.31095461210779 6.4722e-09 au
q 2.080446982152208 5.9907e-08 au
i 7.507796234039592 4.2146e-06 deg
node 342.3608001282889 2.0696e-05 deg
peri 286.012349179074 3.0835e-05 deg
M 84.31275794719437 2.1697e-05 deg
tp 2458899.977947977532
(2020-Feb-20.47794798)
7.7504e-05 TDB
period 1283.173998362709
3.51
5.3906e-06
1.476e-08
d
yr
n .2805543133350186 1.1786e-09 deg/d
Q 2.541462242063373 7.1178e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2252  
   data-arc span      12927 days (35.39 yr)  
   first obs. used      1985-09-20  
   last obs. used      2021-02-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46287  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:22:52  

Additional Information
 Earth MOID = 1.0778 au 
 Jupiter MOID = 2.56367 au 
 T_jup = 3.566 
[ 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 14.32   n/a E2021B10  
diameter diameter 3.538 km 0.582 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.323   0.169 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

20511 (1999 RJ31)          Discovered 1999-Sep-08 by Korlevic, K. at Visnjan
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 RJ31 = 1985 SA4 = 1991 GT11 = 1998 FJ129 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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