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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 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04598291290361746 4.8689e-08  
a 2.445705443206068 2.1189e-08 AU
q 2.333244782823221 1.2493e-07 AU
i 3.886313579974388 6.7287e-06 deg
node 157.8152835245693 7.8735e-05 deg
peri 108.2749952114985 0.00011807 deg
M 106.3233828975424 8.4205e-05 deg
tp 2456587.898371821224
(2013-Oct-22.39837182)
0.00032792 JED
period 1397.026525082404
3.82
1.8155e-05
4.971e-08
d
yr
n .2576901680365485 3.3488e-09 deg/d
Q 2.558166103588916 2.2163e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      936  
   data-arc span      8356 days (22.88 yr)  
   first obs. used      1991-09-13  
   last obs. used      2014-07-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53067  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Aug-13 14:35:30  

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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