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JPL Small-Body Database Browser
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15985 (1998 WU20)
Classification: Main-belt Asteroid          SPK-ID: 2015985
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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05007266889003693 3.5949e-08  
a 2.221880504918888 8.3414e-09 au
q 2.110625018082856 8.1571e-08 au
i 7.544003388636153 4.0707e-06 deg
node 216.9686711499451 3.0673e-05 deg
peri 9.228565357842468 5.7723e-05 deg
M 9.721856313940929 5.1662e-05 deg
tp 2458967.831727333972
(2020-Apr-28.33172733)
0.00017353 TDB
period 1209.70499665846
3.31
6.8122e-06
1.865e-08
d
yr
n .2975932156967357 1.6758e-09 deg/d
Q 2.333135991754919 8.759e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1620  
   data-arc span      11876 days (32.51 yr)  
   first obs. used      1987-06-02  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51391  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 00:05:53  

Additional Information
 Earth MOID = 1.10165 au 
 Jupiter MOID = 2.63933 au 
 T_jup = 3.636 
[ 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 14.0   n/a MPO324456  
diameter diameter 6.340 km 0.068 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.110   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

15985 (1998 WU20)          Discovered 1998-Nov-18 by LINEAR at Socorro
Reference: 20000726/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 WU20 = 1987 LA = 1988 VQ5 = 1991 RB14 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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