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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08365375861327533 4.2453e-08  
a 3.209627451811743 1.9652e-08 au
q 2.941130051719341 1.3101e-07 au
i 4.90746682053297 5.2745e-06 deg
node 18.09154258816443 4.9369e-05 deg
peri 107.7696346001266 5.8094e-05 deg
M 156.4068961627038 3.0883e-05 deg
tp 2458287.998131146673
(2018-Jun-18.49813115)
0.0001774 TDB
period 2100.295324865162
5.75
1.9289e-05
5.281e-08
d
yr
n .1714044666661874 1.5742e-09 deg/d
Q 3.478124851904144 2.1296e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1449  
   data-arc span      8880 days (24.31 yr)  
   first obs. used      1996-03-21  
   last obs. used      2020-07-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50304  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:26:13  

Additional Information
 Earth MOID = 1.96114 au 
 Jupiter MOID = 1.57133 au 
 T_jup = 3.181 
[ 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 13.39   n/a E2021B10  
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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