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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2247002671882316 1.0563e-07  
a 2.673375428706011 2.0178e-08 au
q 2.072667255581317 2.7531e-07 au
i 4.886719833474269 7.208e-06 deg
node 75.5713451855319 7.9434e-05 deg
peri 316.9383858426428 8.0966e-05 deg
M 195.4241725927631 1.4162e-05 deg
tp 2458130.380736179325
(2018-Jan-11.88073618)
6.6691e-05 JED
period 1596.57143557525
4.37
1.8076e-05
4.949e-08
d
yr
n .2254831772499367 2.5528e-09 deg/d
Q 3.274083601830705 2.4712e-08 au
  Orbit Determination Parameters
   # obs. used (total)      586  
   data-arc span      13374 days (36.62 yr)  
   first obs. used      1978-11-29  
   last obs. used      2015-07-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54825  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Sep-02 14:56:24  

Additional Information
 Earth MOID = 1.08074 au 
 Jupiter MOID = 2.16792 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 15.1 mag n/a MPO337436  

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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