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129840 (1999 RU21)
Classification: Main-belt Asteroid          SPK-ID: 2129840
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1985602019721917 5.764e-08  
a 2.582205989784251 1.9e-08 au
q 2.069482646918887 1.5699e-07 au
i 11.91863836426916 6.4132e-06 deg
node 3.762092623936168 3.1654e-05 deg
peri 314.3467972210107 3.948e-05 deg
M 21.31206770729165 2.7542e-05 deg
tp 2458910.776162607261
(2020-Mar-02.27616261)
0.00011521 TDB
period 1515.600546367207
4.15
1.6728e-05
4.58e-08
d
yr
n .2375296055830118 2.6217e-09 deg/d
Q 3.094929332649615 2.2773e-08 au
  Orbit Determination Parameters
   # obs. used (total)      311  
   data-arc span      7225 days (19.78 yr)  
   first obs. used      1999-08-22  
   last obs. used      2019-06-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .62977  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-29 17:57:02  

Additional Information
 Earth MOID = 1.0766 au 
 Jupiter MOID = 2.31413 au 
 T_jup = 3.366 
[ 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 15.5   n/a MPO436629  
diameter diameter 3.213 km 0.637 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.098   0.057 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

129840 (1999 RU21)          Discovered 1999-Sep-07 by LINEAR at Socorro
Reference: 20060711/Numbers.arcLast Updated: 2006-07-17

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