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39531 (1990 ER2)
Classification: Main-belt Asteroid          SPK-ID: 2039531
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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08101934003320568 6.1919e-08  
a 2.49526563478208 1.1544e-08 au
q 2.293100859844498 1.5237e-07 au
i 4.533664854523728 5.6312e-06 deg
node 234.7570891217524 5.6872e-05 deg
peri 7.100566659076135 6.8965e-05 deg
M 178.294357988449 3.6963e-05 deg
tp 2458287.468519102842
(2018-Jun-17.96851910)
0.00014766 TDB
period 1439.705305423107
3.94
9.9907e-06
2.735e-08
d
yr
n .2500511727253805 1.7352e-09 deg/d
Q 2.697430409719662 1.2479e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1065  
   data-arc span      10920 days (29.90 yr)  
   first obs. used      1990-02-24  
   last obs. used      2020-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5176  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 05:29:13  

Additional Information
 Earth MOID = 1.2804 au 
 Jupiter MOID = 2.30367 au 
 T_jup = 3.461 
[ show covariance matrix ]

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 15.1   n/a MPO502430  
diameter diameter 2.982 km 0.133 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.196   0.036 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

39531 (1990 ER2)          Discovered 1990-Mar-02 by Elst, E. W. at La Silla
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1990 ER2 = 1998 HJ18 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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