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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 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04598289247699383 4.551e-08  
a 2.445705454005267 1.9115e-08 AU
q 2.333244843083345 1.1403e-07 AU
i 3.886313538067271 6.7229e-06 deg
node 157.815286279584 7.5927e-05 deg
peri 108.27497120 0.00011475 deg
M 106.3233985771677 8.3161e-05 deg
tp 2456587.898308241600
(2013-Oct-22.39830824)
0.00032351 JED
period 1397.026534335419
3.82
1.6379e-05
4.484e-08
d
yr
n .2576901663297727 3.0211e-09 deg/d
Q 2.558166064927188 1.9994e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      968  
   data-arc span      8392 days (22.98 yr)  
   first obs. used      1991-09-13  
   last obs. used      2014-09-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52674  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Sep-12 14:14:17  

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 (675)
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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