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12202 (1981 EM13)
Classification: Main-belt Asteroid          SPK-ID: 2012202
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08105239421581217 4.0043e-08  
a 2.212237280822932 7.7871e-09 au
q 2.032930152638755 8.8453e-08 au
i 5.005794592486049 3.5257e-06 deg
node 232.7867333100531 4.6876e-05 deg
peri 311.2437652216162 5.1133e-05 deg
M 25.63371882809601 2.1207e-05 deg
tp 2459114.923385245288
(2020-Sep-22.42338525)
7.0695e-05 TDB
period 1201.838153812061
3.29
6.3457e-06
1.737e-08
d
yr
n .2995411643890077 1.5816e-09 deg/d
Q 2.391544409007109 8.4182e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1031  
   data-arc span      14823 days (40.58 yr)  
   first obs. used      1979-10-18  
   last obs. used      2020-05-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52577  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 23:11:40  

Additional Information
 Earth MOID = 1.03717 au 
 Jupiter MOID = 2.57878 au 
 T_jup = 3.647 
[ 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 15.75   n/a E2021B10  
diameter diameter 1.922 km 0.286 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.363   0.112 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

12202 (1981 EM13)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 19991123/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EM13 = 1991 GN8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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