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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2234817354646294 1.0562e-07  
a 2.676279756313793 2.1105e-08 AU
q 2.078180111783931 2.7528e-07 AU
i 4.88727092570369 8.8014e-06 deg
node 75.64307921424837 8.0695e-05 deg
peri 317.1081631524043 8.3034e-05 deg
M 60.03470142302136 1.5474e-05 deg
tp 2456533.816869369372
(2013-Aug-29.31686937)
6.8361e-05 JED
period 1599.173890289572
4.38
1.8917e-05
5.179e-08
d
yr
n .2251162316906091 2.6629e-09 deg/d
Q 3.274379400843654 2.5822e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      482  
   data-arc span      12894 days (35.30 yr)  
   first obs. used      1978-11-29  
   last obs. used      2014-03-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54756  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 22:54:04  

Additional Information
 Earth MOID = 1.08644 AU 
 T_jup = 3.337 
[ 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 (399)
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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