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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1343527902824177 3.4749e-08  
a 2.251027618803062 7.4854e-09 au
q 1.948595777214084 7.7313e-08 au
i 3.174640795741491 4.8501e-06 deg
node 204.02242401 6.1815e-05 deg
peri 43.78839921601926 6.4203e-05 deg
M 165.8568373568591 1.7206e-05 deg
tp 2458432.170052580170
(2018-Nov-09.67005258)
5.8493e-05 TDB
period 1233.586654199381
3.38
6.1532e-06
1.685e-08
d
yr
n .2918319509817057 1.4557e-09 deg/d
Q 2.55345946039204 8.4911e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1429  
   data-arc span      14220 days (38.93 yr)  
   first obs. used      1981-02-12  
   last obs. used      2020-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51353  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 23:16:35  

Additional Information
 Earth MOID = .936458 au 
 Jupiter MOID = 2.46525 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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