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20667 (1999 UM11)
Classification: Main-belt Asteroid          SPK-ID: 2020667
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1247551123251749 3.108e-08  
a 3.191935846551992 1.6511e-08 au
q 2.793725531480646 9.8238e-08 au
i 1.683943803629008 4.1276e-06 deg
node 61.26468326081125 0.00014718 deg
peri 25.86908039219991 0.00014869 deg
M 188.6758333801609 2.0262e-05 deg
tp 2459991.778724422259
(2023-Feb-16.27872442)
0.00011903 TDB
period 2082.953898639827
5.70
1.6161e-05
4.425e-08
d
yr
n .1728314775641846 1.341e-09 deg/d
Q 3.590146161623339 1.857e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1558  
   data-arc span      10705 days (29.31 yr)  
   first obs. used      1990-03-01  
   last obs. used      2019-06-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5118  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:01:27  

Additional Information
 Earth MOID = 1.8102 au 
 Jupiter MOID = 1.61071 au 
 T_jup = 3.184 
[ 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 13.7   n/a MPO350966  
diameter diameter 8.288 km 0.328 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 10.71 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Chang, C.-H.; Lin, H.-W.; Ip, W.-H.; Chen, W.-P.; et al. (2019) ArXiv:1901.08719.]
geometric albedo albedo 0.078   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20667 (1999 UM11)          Discovered 1999-Oct-27 by Korlevic, K. at Visnjan
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 UM11 = 1990 EY5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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