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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 3 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04597116240036768 5.2896e-08  
a 2.446072818156922 2.2577e-08 AU
q 2.333624007390305 1.3663e-07 AU
i 3.886041596424298 7.0287e-06 deg
node 157.8142804315295 8.356e-05 deg
peri 108.4639833464018 0.00012493 deg
M 54.60638582553522 8.9058e-05 deg
tp 2456588.545114305407
(2013-Oct-23.04511431)
0.00034643 JED
period 1397.341312677978
3.83
1.9346e-05
5.297e-08
d
yr
n .2576321166015388 3.5669e-09 deg/d
Q 2.558521628923538 2.3615e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      916  
   data-arc span      7936 days (21.73 yr)  
   first obs. used      1991-09-13  
   last obs. used      2013-06-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55279  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Aug-05 19:40:39  

Additional Information
 Earth MOID = 1.32091 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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