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JPL Small-Body Database Browser
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20987 (1981 EU38)
Classification: Main-belt Asteroid          SPK-ID: 2020987
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1345802624310688 3.4877e-08  
a 2.25086611962298 7.5563e-09 au
q 1.947943966546918 7.7689e-08 au
i 3.174908672352862 4.8507e-06 deg
node 204.0240005288793 6.2499e-05 deg
peri 43.76494667911939 6.4866e-05 deg
M 49.11898075439262 1.7084e-05 deg
tp 2458432.205559832822
(2018-Nov-09.70555983)
5.8408e-05 TDB
period 1233.45390172344
3.38
6.2112e-06
1.701e-08
d
yr
n .2918633598685698 1.4697e-09 deg/d
Q 2.553788272699042 8.5732e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1414  
   data-arc span      14167 days (38.79 yr)  
   first obs. used      1981-02-12  
   last obs. used      2019-11-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51378  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 00:48:03  

Additional Information
 Earth MOID = .935616 au 
 Jupiter MOID = 2.46516 au 
 T_jup = 3.613 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.8   n/a MPO395204  
diameter diameter 2.791 km 0.560 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
geometric albedo albedo 0.299   0.154 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

20987 (1981 EU38)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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