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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04598290417744433 4.1008e-08  
a 2.445705447658221 1.5966e-08 AU
q 2.333244808412299 9.8006e-08 AU
i 3.88631386838728 6.5536e-06 deg
node 157.8152566641939 6.8271e-05 deg
peri 108.2750171308155 0.00010725 deg
M 106.3233855741393 8.1402e-05 deg
tp 2456587.898360307696
(2013-Oct-22.39836031)
0.00031615 JED
period 1397.026528897116
3.82
1.368e-05
3.745e-08
d
yr
n .2576901673329013 2.5233e-09 deg/d
Q 2.558166086904142 1.67e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1106  
   data-arc span      8538 days (23.38 yr)  
   first obs. used      1991-09-13  
   last obs. used      2015-01-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50777  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 15:03:21  

Additional Information
 Earth MOID = 1.32236 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 14.2 mag n/a PDS3 (MPO 8636)  

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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