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20390 (1998 KK55)
Classification: Main-belt Asteroid          SPK-ID: 2020390
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03243802384109831 3.2673e-08  
a 2.739290423628368 1.2549e-08 au
q 2.650433255559019 8.8912e-08 au
i 9.585867916986793 4.5665e-06 deg
node 182.2421340666758 1.9633e-05 deg
peri 241.2086677704883 7.2572e-05 deg
M 180.4900072536618 7.1091e-05 deg
tp 2460026.236865451450
(2023-Mar-22.73686545)
0.00032799 TDB
period 1655.981747949716
4.53
1.1379e-05
3.115e-08
d
yr
n .2173937004110817 1.4938e-09 deg/d
Q 2.828147591697717 1.2956e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1788  
   data-arc span      8497 days (23.26 yr)  
   first obs. used      1997-04-07  
   last obs. used      2020-07-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50078  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:19:16  

Additional Information
 Earth MOID = 1.67274 au 
 Jupiter MOID = 2.26438 au 
 T_jup = 3.330 
[ 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 13.98   n/a E2021B10  
diameter diameter 4.658 km 0.351 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.246   0.097 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20390 (1998 KK55)          Discovered 1998-May-23 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 KK55 = 1999 RU176 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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