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52245 (1981 EP4)
Classification: Main-belt Asteroid          SPK-ID: 2052245
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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04591911564102127 4.3197e-08  
a 2.775106075387017 1.9719e-08 au
q 2.64767565859522 1.2214e-07 au
i 11.57755835767292 4.9298e-06 deg
node 209.9597924940566 2.2425e-05 deg
peri 318.9784017531312 5.8003e-05 deg
M 179.9405079277201 5.3659e-05 deg
tp 2458156.496494447272
(2018-Feb-06.99649445)
0.00025198 TDB
period 1688.565101311326
4.62
1.7998e-05
4.928e-08
d
yr
n .2131987684220329 2.2724e-09 deg/d
Q 2.902536492178814 2.0625e-08 au
  Orbit Determination Parameters
   # obs. used (total)      832  
   data-arc span      14081 days (38.55 yr)  
   first obs. used      1981-02-02  
   last obs. used      2019-08-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53614  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 10:24:52  

Additional Information
 Earth MOID = 1.65986 au 
 Jupiter MOID = 2.08482 au 
 T_jup = 3.304 
[ 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 14.8   n/a MPO439446  
diameter diameter 3.292 km 1.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.136   0.090 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

52245 (1981 EP4)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20030216/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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