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19997 (1990 WM1)
Classification: Main-belt Asteroid          SPK-ID: 2019997
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1266719330806047 3.3723e-08  
a 2.988973362731388 1.582e-08 au
q 2.610354328947767 1.0697e-07 au
i 6.897808023493188 4.0311e-06 deg
node 139.4581088940148 2.7838e-05 deg
peri 279.4254545524834 3.3241e-05 deg
M 331.3490832172429 2.0818e-05 deg
tp 2459546.716457647412
(2021-Nov-28.21645765)
0.00010974 TDB
period 1887.476242491969
5.17
1.4985e-05
4.103e-08
d
yr
n .1907308775048234 1.5143e-09 deg/d
Q 3.367592396515008 1.7824e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1371  
   data-arc span      11019 days (30.17 yr)  
   first obs. used      1990-11-11  
   last obs. used      2021-01-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53768  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:48:39  

Additional Information
 Earth MOID = 1.63361 au 
 Jupiter MOID = 1.97917 au 
 T_jup = 3.234 
[ 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 MPO347679  
diameter diameter 3.717 km 0.792 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.352   0.163 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19997 (1990 WM1)          Discovered 1990-Nov-18 by Elst, E. W. at La Silla
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1990 WM1 = 1992 EA12 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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