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18364 (1990 WF4)
Classification: Main-belt Asteroid          SPK-ID: 2018364
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1429456619296755 3.5684e-08  
a 3.147504022110393 1.944e-08 au
q 2.697581976243507 1.1072e-07 au
i 11.98365763593342 4.3922e-06 deg
node 95.42562102691927 2.1941e-05 deg
peri 46.67628166445279 2.8047e-05 deg
M 116.3197792833846 1.6924e-05 deg
tp 2458737.479481984685
(2019-Sep-10.97948198)
9.5563e-05 TDB
period 2039.613451359106
5.58
1.8896e-05
5.173e-08
d
yr
n .176504033036315 1.6352e-09 deg/d
Q 3.59742606797728 2.2219e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1500  
   data-arc span      11175 days (30.60 yr)  
   first obs. used      1990-11-16  
   last obs. used      2021-06-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48913  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 04:36:25  

Additional Information
 Earth MOID = 1.72819 au 
 Jupiter MOID = 1.55513 au 
 T_jup = 3.159 
[ 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 13.65   n/a E2021B10  
diameter diameter 13.657 km 0.294 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.034   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18364 (1990 WF4)          Discovered 1990-Nov-16 by Elst, E. W. at La Silla
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1990 WF4 = 1998 HU120 = 1999 NQ17 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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