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85138 (1981 ED7)
Classification: Main-belt Asteroid          SPK-ID: 2085138
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 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1022312803443531 4.3703e-08  
a 3.169680361143912 3.4069e-08 au
q 2.845639879541818 1.5006e-07 au
i 13.63360637870306 6.6351e-06 deg
node 217.1029784603349 2.3003e-05 deg
peri 59.76786726359601 4.521e-05 deg
M 263.1522065678731 4.1797e-05 deg
tp 2459555.009332633443
(2021-Dec-06.50933263)
0.00024408 TDB
period 2061.207103163788
5.64
3.3232e-05
9.098e-08
d
yr
n .1746549385781898 2.8159e-09 deg/d
Q 3.493720842746005 3.7552e-08 au
  Orbit Determination Parameters
   # obs. used (total)      481  
   data-arc span      14321 days (39.21 yr)  
   first obs. used      1981-02-08  
   last obs. used      2020-04-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58611  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 15:33:46  

Additional Information
 Earth MOID = 1.85929 au 
 Jupiter MOID = 1.63318 au 
 T_jup = 3.151 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457072.5 (2015-Feb-19.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1010735178564671 4.3805e-08  
q 2.849392737046107 1.5028e-07 au
tp 2457489.420559800672
(2016-Apr-10.92055980)
0.0002299 TDB
node 217.1340538503265 2.3e-05 deg
peri 59.16747634506191 4.5551e-05 deg
i 13.63331991995226 6.6352e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      481  
   data-arc span      14321 days (39.21 yr)  
   first obs. used      1981-02-08  
   last obs. used      2020-04-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58611  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 15:33:46  

Additional Information
 Jupiter MOID = 1.63318 au 
 T_jup = 3.151 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.918847660447742E-15 -6.456848618753685E-15 -1.294905592149015E-12 1.492327749864722E-15 -1.95495065189267E-13 -4.983936125157159E-16
q -6.456848618753685E-15 2.258282706163136E-14 7.228553494968125E-12 -2.214011149004529E-14 1.131523733658611E-12 1.178169081900911E-14
tp -1.294905592149015E-12 7.228553494968125E-12 5.285486724315428E-8 2.68969361982779E-11 9.068224000655421E-9 2.046556994174772E-11
node 1.492327749864722E-15 -2.214011149004529E-14 2.68969361982779E-11 5.28987640214942E-10 -5.097937203112622E-10 -4.599494100338476E-11
peri -1.95495065189267E-13 1.131523733658611E-12 9.068224000655421E-9 -5.097937203112622E-10 2.074854510787369E-9 4.858328678258972E-11
i -4.983936125157159E-16 1.178169081900911E-14 2.046556994174772E-11 -4.599494100338476E-11 4.858328678258972E-11 4.402646060814195E-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 14.8   n/a MPO287326  
diameter diameter 6.707 km 0.267 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.039   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

85138 (1981 ED7)          Discovered 1981-Mar-06 by Bus, S. J. at Siding Spring
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

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