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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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1460927494421033 3.5941e-08  
a 2.733506760147184 1.233e-08 au
q 2.334161241938706 1.019e-07 au
i 3.744482947115011 3.9084e-06 deg
node 70.80905975254903 6.0287e-05 deg
peri 198.9629070523509 6.2256e-05 deg
M 51.83912015593323 1.5796e-05 deg
tp 2459158.797485249269
(2020-Nov-05.29748525)
7.2395e-05 TDB
period 1650.739924845521
4.52
1.1169e-05
3.058e-08
d
yr
n .2180840207361493 1.4756e-09 deg/d
Q 3.132852278355662 1.4132e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1534  
   data-arc span      11177 days (30.60 yr)  
   first obs. used      1990-11-14  
   last obs. used      2021-06-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48591  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:07:08  

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 14.53   n/a E2021B10  
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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