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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08119512274719165 4.0036e-08  
a 2.21256541215955 7.7946e-09 au
q 2.032915891933064 8.8457e-08 au
i 5.005610175751297 3.5255e-06 deg
node 232.7909954874786 4.6877e-05 deg
peri 311.2286588051465 5.112e-05 deg
M 325.7430283351883 2.1101e-05 deg
tp 2459114.890266840797
(2020-Sep-22.39026684)
7.0594e-05 TDB
period 1202.105558705499
3.29
6.3523e-06
1.739e-08
d
yr
n .2994745323261545 1.5825e-09 deg/d
Q 2.392214932386035 8.4275e-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.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52564  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:54:35  

Additional Information
 Earth MOID = 1.03779 au 
 Jupiter MOID = 2.5792 au 
 T_jup = 3.647 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456709.5 (2014-Feb-21.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08107513941859218 4.0088e-08  
q 2.032932041044177 8.8548e-08 au
tp 2456711.065711322944
(2014-Feb-22.56571132)
6.8982e-05 TDB
node 232.8211821728256 4.6899e-05 deg
peri 311.3160219201142 5.1151e-05 deg
i 5.004148805169748 3.5254e-06 deg
  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.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52564  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:54:35  

Additional Information
 Jupiter MOID = 2.5792 au 
 T_jup = 3.647 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.60702094040535E-15 -3.538172675354625E-15 -5.276220308428731E-13 1.257662620600792E-14 -1.538837984069476E-13 -4.803473918937906E-16
q -3.538172675354625E-15 7.840752595996966E-15 1.187989284066846E-12 -2.81405110603298E-14 3.462087499890357E-13 1.190012224840481E-15
tp -5.276220308428731E-13 1.187989284066846E-12 4.758474988506586E-9 -1.300903674095795E-11 1.425361633840158E-9 1.818915916564863E-12
node 1.257662620600792E-14 -2.81405110603298E-14 -1.300903674095795E-11 2.199499446375702E-9 -2.194695372959802E-9 -4.022970618411008E-11
peri -1.538837984069476E-13 3.462087499890357E-13 1.425361633840158E-9 -2.194695372959802E-9 2.616412871986053E-9 4.062567106476889E-11
i -4.803473918937906E-16 1.190012224840481E-15 1.818915916564863E-12 -4.022970618411008E-11 4.062567106476889E-11 1.242836712901008E-11

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 15.7   n/a MPO445357  
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

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2048-Jan-09 00:01 < 00:01 Hebe 0.0322232880699586 0.032222668710405 0.0322239074331762 7.74759165718275 7.74759163228151 2469084.501032427 0.200940893971048 190.58660425677 30.7514357101867 89.1425700950053 156711.730856424 T 24 CATAB v2.0f-lin.ifort 2020-Nov-13 02:54:37 2020-Nov-13 02:54
2090-Dec-04 08:50 < 00:01 Iris 0.0326425324946999 0.0326367464299332 0.032648319308805 6.11629580233006 6.11629577353614 2484754.868350130 0.175774645228683 381.09948735937 40.3320480103954 -41.0804756206171 80124.6803189603 T 24 CATAB v2.0f-lin.ifort 2020-Nov-13 02:54:37 2020-Nov-13 02:54
2183-Feb-02 21:04 < 00:01 Iris 0.0249815157900158 0.0249700621896052 0.0249929749066276 5.79810766041184 5.79810762072304 2518417.377492001 0.166767753258981 818.757234647223 40.335468587561 45.8411680977908 66526.4556162364 T 24 CATAB v2.0f-lin.ifort 2020-Nov-13 02:54:37 2020-Nov-13 02:54

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