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21080 (1991 RD18)
Classification: Main-belt Asteroid          SPK-ID: 2021080
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0456532120740269 3.7839e-08  
a 2.446575204247001 1.3973e-08 au
q 2.334881187592457 9.2521e-08 au
i 3.88649558612079 5.489e-06 deg
node 157.8148695368361 6.07e-05 deg
peri 107.6115353668035 8.9335e-05 deg
M 261.6100392238637 6.7286e-05 deg
tp 2457982.518652523435
(2017-Aug-17.01865252)
0.00026234 JED
period 1397.771823706152
3.83
1.1975e-05
3.279e-08
d
yr
n .2575527664060864 2.2064e-09 deg/d
Q 2.558269220901545 1.4611e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1326  
   data-arc span      8973 days (24.57 yr)  
   first obs. used      1991-09-13  
   last obs. used      2016-04-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49824  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:36:07  

Additional Information
 Earth MOID = 1.32242 au 
 Jupiter MOID = 2.45886 au 
 T_jup = 3.494 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.3 mag n/a MPO358831  

21080 (1991 RD18)          Discovered 1991-Sep-13 by Holt, H. E. at Palomar
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 RD18 = 1998 MO21 = 1999 UL14 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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