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123927 (2001 ER4)
Classification: Main-belt Asteroid          SPK-ID: 2123927
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1808976870282966 4.2529e-08  
a 3.024020968641179 2.2932e-08 au
q 2.476982569888921 1.2797e-07 au
i 3.101468247313351 3.9866e-06 deg
node 100.2116817397206 0.00011133 deg
peri 140.9488788292999 0.00011217 deg
M 183.5735900832615 1.5224e-05 deg
tp 2459941.818773508769
(2022-Dec-28.31877351)
8.4955e-05 TDB
period 1920.771151116678
5.26
2.1848e-05
5.982e-08
d
yr
n .1874247225083045 2.1319e-09 deg/d
Q 3.571059367393437 2.708e-08 au
  Orbit Determination Parameters
   # obs. used (total)      451  
   data-arc span      9919 days (27.16 yr)  
   first obs. used      1992-09-28  
   last obs. used      2019-11-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58724  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 17:31:28  

Additional Information
 Earth MOID = 1.46531 au 
 Jupiter MOID = 1.44848 au 
 T_jup = 3.218 
[ 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 15.2   n/a MPO449715  
diameter diameter 5.340 km 1.336 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.056   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

123927 (2001 ER4)          Discovered 2001-Mar-02 by LONEOS at Anderson Mesa
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

[ show close-approach data ]
Alternate Designations
 2001 ER4 = 2002 NZ8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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