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49365 (1998 WR18)
Classification: Main-belt Asteroid          SPK-ID: 2049365
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09768146728656418 3.5489e-08  
a 2.69521492958485 1.2726e-08 au
q 2.431942380610348 9.2669e-08 au
i 6.733215530551596 3.8583e-06 deg
node 255.0976496320392 3.1628e-05 deg
peri 18.71947715794609 3.776e-05 deg
M 91.88350608385331 1.9805e-05 deg
tp 2458588.000344471833
(2019-Apr-14.50034447)
8.9017e-05 TDB
period 1616.175550099475
4.42
1.1447e-05
3.134e-08
d
yr
n .2227480795498002 1.5777e-09 deg/d
Q 2.958487478559352 1.3969e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1645  
   data-arc span      8031 days (21.99 yr)  
   first obs. used      1998-11-21  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50683  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 21:27:53  

Additional Information
 Earth MOID = 1.41681 au 
 Jupiter MOID = 2.12797 au 
 T_jup = 3.353 
[ 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 13.9   n/a MPO502484  
diameter diameter 4.482 km 0.349 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.291   0.092 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

49365 (1998 WR18)          Discovered 1998-Nov-21 by LINEAR at Socorro
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 WR18 = 2000 AY142 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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