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21344 (1997 EM)
Classification: Main-belt Asteroid          SPK-ID: 2021344
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1460927502864819 3.3606e-08  
a 2.733506759964933 1.1944e-08 au
q 2.334161239474966 9.4765e-08 au
i 3.744482370240319 3.8128e-06 deg
node 70.80906184947952 6.0207e-05 deg
peri 198.9629048474993 6.2171e-05 deg
M 51.83912036642713 1.5623e-05 deg
tp 2459158.797484307845
(2020-Nov-05.29748431)
7.1659e-05 TDB
period 1650.739924680431
4.52
1.0819e-05
2.962e-08
d
yr
n .2180840207579598 1.4294e-09 deg/d
Q 3.1328522804549 1.3689e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1564  
   data-arc span      11225 days (30.73 yr)  
   first obs. used      1990-11-14  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48309  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:42:00  

Additional Information
 Earth MOID = 1.31837 au 
 Jupiter MOID = 1.95641 au 
 T_jup = 3.335 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457415.5 (2016-Jan-28.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1443920872155731 3.3761e-08  
q 2.337677062934687 9.4669e-08 au
tp 2457508.156424065907
(2016-Apr-29.65642407)
7.347e-05 TDB
node 70.85741608092222 6.0142e-05 deg
peri 198.8051348352256 6.2139e-05 deg
i 3.746407002493909 3.8147e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1564  
   data-arc span      11225 days (30.73 yr)  
   first obs. used      1990-11-14  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48309  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:42:00  

Additional Information
 Jupiter MOID = 1.95641 au 
 T_jup = 3.335 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.139771493528446E-15 -3.179009823492499E-15 -6.973492609515619E-13 -8.878089340983938E-15 -1.013491610254911E-13 1.806128127362003E-16
q -3.179009823492499E-15 8.962291493152078E-15 1.771300800142632E-12 2.494008376275512E-14 2.433560875165209E-13 -4.260012551362292E-16
tp -6.973492609515619E-13 1.771300800142632E-12 5.397894009058075E-9 8.030834710483709E-12 1.162631220128743E-9 1.016778279814806E-12
node -8.878089340983938E-15 2.494008376275512E-14 8.030834710483709E-12 3.617025293021835E-9 -3.607834316589796E-9 -6.710125679217356E-11
peri -1.013491610254911E-13 2.433560875165209E-13 1.162631220128743E-9 -3.607834316589796E-9 3.861210764386032E-9 6.720912507954581E-11
i 1.806128127362003E-16 -4.260012551362292E-16 1.016778279814806E-12 -6.710125679217356E-11 6.720912507954581E-11 1.455176033910748E-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 14.54   n/a MPO636384  
diameter diameter 4.855 km 0.136 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.143   0.040 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21344 (1997 EM)          Discovered 1997-Mar-02 by Kobayashi, T. at Oizumi
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1997 EM = 1990 VM13 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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