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JPL Small-Body Database Browser
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19938 (1981 EN15)
Classification: Main-belt Asteroid          SPK-ID: 2019938
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1053019410264541 4.7078e-08  
a 2.266781072710906 9.7187e-09 au
q 2.028084625872419 1.0489e-07 au
i 2.37553395375609 4.7499e-06 deg
node 284.0954426388064 0.00011845 deg
peri 175.6581053331677 0.00012155 deg
M 244.5583977287425 2.7041e-05 deg
tp 2459400.235425851144
(2021-Jul-04.73542585)
9.4396e-05 TDB
period 1246.558870243963
3.41
8.0168e-06
2.195e-08
d
yr
n .2887950249229262 1.8573e-09 deg/d
Q 2.505477519549391 1.0742e-08 au
  Orbit Determination Parameters
   # obs. used (total)      667  
   data-arc span      14581 days (39.92 yr)  
   first obs. used      1979-09-18  
   last obs. used      2019-08-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57709  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 01:28:56  

Additional Information
 Earth MOID = 1.04497 au 
 Jupiter MOID = 2.60997 au 
 T_jup = 3.607 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456537.5 (2013-Sep-02.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1050971870311216 4.7169e-08  
q 2.028614287272816 1.0514e-07 au
tp 2456905.181987500241
(2014-Sep-04.68198750)
9.0678e-05 TDB
node 284.1641255618135 0.00011848 deg
peri 175.242705399672 0.00012159 deg
i 2.375010310816099 4.7485e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      667  
   data-arc span      14581 days (39.92 yr)  
   first obs. used      1979-09-18  
   last obs. used      2019-08-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57709  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 01:28:56  

Additional Information
 Jupiter MOID = 2.60997 au 
 T_jup = 3.607 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.224903210818249E-15 -4.943847449453729E-15 -1.848257691769957E-13 1.027110433750015E-14 -1.760146661183868E-13 -9.045676526226545E-16
q -4.943847449453729E-15 1.105536344171024E-14 5.444309725191097E-13 -2.209811281207658E-14 4.242025830524492E-13 2.052656277934447E-15
tp -1.848257691769957E-13 5.444309725191097E-13 8.222581952546775E-9 4.527515732977037E-11 2.483934903725681E-9 -2.947119092849394E-12
node 1.027110433750015E-14 -2.209811281207658E-14 4.527515732977037E-11 1.403847982216913E-8 -1.40128211638129E-8 6.414244175226526E-11
peri -1.760146661183868E-13 4.242025830524492E-13 2.483934903725681E-9 -1.40128211638129E-8 1.478334321212934E-8 -6.494294470659692E-11
i -9.045676526226545E-16 2.052656277934447E-15 -2.947119092849394E-12 6.414244175226526E-11 -6.494294470659692E-11 2.254816842812412E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.9   n/a MPO337426  
diameter diameter 2.073 km 0.259 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.216   0.094 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

19938 (1981 EN15)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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