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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 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04598290266999574 4.1043e-08  
a 2.445705448585298 1.5996e-08 AU
q 2.333244812983521 9.8135e-08 AU
i 3.886314319434645 6.5608e-06 deg
node 157.8152556863086 6.839e-05 deg
peri 108.275014516161 0.00010737 deg
M 106.3233886703015 8.1452e-05 deg
tp 2456587.898348058035
(2013-Oct-22.39834806)
0.00031635 JED
period 1397.026529691458
3.82
1.3706e-05
3.752e-08
d
yr
n .25769016718638 2.5281e-09 deg/d
Q 2.558166084187074 1.6731e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1065  
   data-arc span      8497 days (23.26 yr)  
   first obs. used      1991-09-13  
   last obs. used      2014-12-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51355  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-08 02:48:56  

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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