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21085 (1991 UL4)
Classification: Main-belt Asteroid          SPK-ID: 2021085
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 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2239824873363499 1.0557e-07  
a 2.67535120771976 2.0591e-08 AU
q 2.07611938971638 2.7518e-07 AU
i 4.885753575658916 7.3773e-06 deg
node 75.60572184592075 7.9483e-05 deg
peri 317.0375797627439 8.112e-05 deg
M 105.1260027027192 1.3987e-05 deg
tp 2456533.757572437350
(2013-Aug-29.25757244)
6.0655e-05 JED
period 1598.341700461209
4.38
1.8452e-05
5.052e-08
d
yr
n .2252334403188757 2.6003e-09 deg/d
Q 3.274583025723139 2.5203e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      572  
   data-arc span      13267 days (36.32 yr)  
   first obs. used      1978-11-29  
   last obs. used      2015-03-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54763  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 17:08:13  

Additional Information
 Earth MOID = 1.0854 AU 
 T_jup = 3.338 
[ 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 15.0 mag n/a MPO279734  

21085 (1991 UL4)          Discovered 1991-Oct-18 by Ueda, S., Kaneda, H. at Kushiro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 UL4 = 1978 WW1 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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