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20018 (1991 UJ2)
Classification: Main-belt Asteroid          SPK-ID: 2020018
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1570531433162552 2.8436e-08  
a 2.306223709914142 6.5936e-09 au
q 1.944024027081651 6.544e-08 au
i 5.32807922125419 4.5775e-06 deg
node 31.25344657314684 3.3614e-05 deg
peri 265.56652756 3.6554e-05 deg
M 143.1663829156938 1.4772e-05 deg
tp 2458491.767916081396
(2019-Jan-08.26791608)
5.2012e-05 TDB
period 1279.23571498307
3.50
5.4861e-06
1.502e-08
d
yr
n .2814180340522813 1.2069e-09 deg/d
Q 2.668423392746634 7.6292e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2177  
   data-arc span      13683 days (37.46 yr)  
   first obs. used      1983-05-08  
   last obs. used      2020-10-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45475  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:05:16  

Additional Information
 Earth MOID = .937198 au 
 Jupiter MOID = 2.53639 au 
 T_jup = 3.566 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.9   n/a MPO449098  
diameter diameter 4.450 km 0.151 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.204   0.035 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20018 (1991 UJ2)          Discovered 1991-Oct-29 by Ueda, S., Kaneda, H. at Kushiro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 UJ2 = 1998 QV6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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