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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04594444629304113 3.9309e-08  
a 2.445643859562909 1.4733e-08 au
q 2.333280106605315 9.4934e-08 au
i 3.886379692693261 5.9959e-06 deg
node 157.8159529323158 6.5154e-05 deg
peri 107.9727943785212 9.7741e-05 deg
M 209.7301277130403 7.3094e-05 deg
tp 2457983.619634337016
(2017-Aug-18.11963434)
0.00028445 JED
period 1396.973759054313
3.82
1.2623e-05
3.456e-08
d
yr
n .2576999014238489 2.3286e-09 deg/d
Q 2.558007612520503 1.541e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1198  
   data-arc span      8864 days (24.27 yr)  
   first obs. used      1991-09-13  
   last obs. used      2015-12-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50825  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:47:01  

Additional Information
 Earth MOID = 1.31953 au 
 Jupiter MOID = 2.45924 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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