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58117 (1981 ER7)
Classification: Main-belt Asteroid          SPK-ID: 2058117
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1012209738784377 3.4028e-08  
a 2.30419556189374 9.705e-09 au
q 2.070962643112482 8.0219e-08 au
i 4.11605379492832 4.3597e-06 deg
node 234.8777420330001 6.0758e-05 deg
peri 43.94940801146214 6.7306e-05 deg
M 343.5762324764106 3.0584e-05 deg
tp 2459058.783781153738
(2020-Jul-28.28378115)
0.00010856 TDB
period 1277.548600539365
3.50
8.0713e-06
2.21e-08
d
yr
n .281789671131112 1.7803e-09 deg/d
Q 2.537428480674998 1.0687e-08 au
  Orbit Determination Parameters
   # obs. used (total)      747  
   data-arc span      14397 days (39.42 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-07-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5627  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 22:52:17  

Additional Information
 Earth MOID = 1.05694 au 
 Jupiter MOID = 2.55099 au 
 T_jup = 3.579 
[ 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 15.9   n/a MPO468479  
diameter diameter 1.643 km 0.291 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.286   0.117 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

58117 (1981 ER7)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20030614/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 ER7 = 2000 WM128 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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