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JPL Small-Body Database Browser
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20984 (1981 EH33)
Classification: Main-belt Asteroid          SPK-ID: 2020984
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05671338960667542 3.9637e-08  
a 3.079192688026534 2.319e-08 au
q 2.904561233436459 1.2927e-07 au
i 9.753998374468351 5.0531e-06 deg
node 191.2288158488437 2.5518e-05 deg
peri 100.550901086045 5.1166e-05 deg
M 342.3415772042752 4.445e-05 deg
tp 2459097.306192068672
(2020-Sep-04.80619207)
0.00024376 TDB
period 1973.575417684483
5.40
2.2295e-05
6.104e-08
d
yr
n .182410054753506 2.0606e-09 deg/d
Q 3.253824142616609 2.4505e-08 au
  Orbit Determination Parameters
   # obs. used (total)      896  
   data-arc span      13961 days (38.22 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-05-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52146  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 23:48:05  

Additional Information
 Earth MOID = 1.90997 au 
 Jupiter MOID = 1.86997 au 
 T_jup = 3.204 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456621.5 (2013-Nov-25.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05468923253918181 3.9906e-08  
q 2.907388742230849 1.2943e-07 au
tp 2457136.323294145574
(2015-Apr-23.82329415)
0.00025014 TDB
node 191.3034368041863 2.5501e-05 deg
peri 102.4087649839856 5.2354e-05 deg
i 9.759627925602393 5.0556e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      896  
   data-arc span      13961 days (38.22 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-05-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52146  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 23:48:05  

Additional Information
 Jupiter MOID = 1.86997 au 
 T_jup = 3.204 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.592518300258831E-15 -5.092231172207066E-15 1.509224271643366E-12 -5.464939937402629E-15 2.80730079656677E-13 -9.323727897659873E-16
q -5.092231172207066E-15 1.675194502338493E-14 -4.684608912772829E-12 1.45805344988514E-14 -8.914212877249679E-13 3.979462850150397E-15
tp 1.509224271643366E-12 -4.684608912772829E-12 6.25711690527714E-8 -4.28274872785717E-12 1.145678163024115E-8 -1.032935007504121E-11
node -5.464939937402629E-15 1.45805344988514E-14 -4.28274872785717E-12 6.503244667058638E-10 -6.414218180056654E-10 -9.763908963428589E-12
peri 2.80730079656677E-13 -8.914212877249679E-13 1.145678163024115E-8 -6.414218180056654E-10 2.740972882049984E-9 7.745403134825711E-12
i -9.323727897659873E-16 3.979462850150397E-15 -1.032935007504121E-11 -9.763908963428589E-12 7.745403134825711E-12 2.555926922699587E-11

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 14.2   n/a MPO474041  
diameter diameter 5.095 km 0.200 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.171   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20984 (1981 EH33)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EH33 = 1998 KQ60 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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