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20660 (1999 UF)
Classification: Outer Main-belt Asteroid          SPK-ID: 2020660
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 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0846454266515099 4.2493e-08  
a 3.205478403361893 1.9835e-08 au
q 2.934149316287125 1.3182e-07 au
i 4.909477392653696 5.2765e-06 deg
node 18.17958877945824 4.9575e-05 deg
peri 107.0187525122066 5.8076e-05 deg
M 122.7800673915195 3.0437e-05 deg
tp 2458285.570732627042
(2018-Jun-16.07073263)
0.00017526 TDB
period 2096.224099906644
5.74
1.9456e-05
5.327e-08
d
yr
n .1717373633935573 1.594e-09 deg/d
Q 3.476807490436662 2.1514e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1431  
   data-arc span      8880 days (24.31 yr)  
   first obs. used      1996-03-21  
   last obs. used      2020-07-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50474  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:01:30  

Additional Information
 Earth MOID = 1.95439 au 
 Jupiter MOID = 1.5759 au 
 T_jup = 3.182 
[ 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 13.4   n/a MPO395201  
diameter diameter 11.147 km 0.291 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 13.056 h n/a LCDB (Rev. 2020-October); 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.082   0.002 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20660 (1999 UF)          Discovered 1999-Oct-16 by Korlevic, K. at Visnjan
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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