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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 ]

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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 
[ 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 14.54   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

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