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21259 (1996 ED4)
Classification: Main-belt Asteroid          SPK-ID: 2021259
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ 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 .06534866318135299 4.6434e-08  
a 3.034395121546718 1.6153e-08 au
q 2.836101456789621 1.3761e-07 au
i 10.08929350970343 5.1515e-06 deg
node 358.9178883272071 1.8986e-05 deg
peri 322.4099975240205 3.6249e-05 deg
M 138.9084764405213 3.0534e-05 deg
tp 2458651.540142415105
(2019-Jun-17.04014242)
0.00016381 TDB
period 1930.66366864513
5.29
1.5416e-05
4.221e-08
d
yr
n .1864643779476283 1.4889e-09 deg/d
Q 3.232688786303815 1.7209e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1838  
   data-arc span      10902 days (29.85 yr)  
   first obs. used      1991-04-13  
   last obs. used      2021-02-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50439  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:42:25  

Additional Information
 Earth MOID = 1.83155 au 
 Jupiter MOID = 2.0558 au 
 T_jup = 3.215 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.52   n/a E2021B10  
diameter diameter 7.221 km 0.315 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.178   0.035 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21259 (1996 ED4)          Discovered 1996-Mar-11 by Spacewatch at Kitt Peak
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1996 ED4 = 1998 QX61 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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