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90905 (1997 EJ21)
Classification: Main-belt Asteroid          SPK-ID: 2090905
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1635701585576769 4.8074e-08  
a 2.7734714800174 1.4687e-08 au
q 2.319814310275759 1.3152e-07 au
i 3.238929037949664 5.6176e-06 deg
node 174.6214465631117 6.3513e-05 deg
peri 216.3965409877848 6.5205e-05 deg
M 121.0318402226902 1.3061e-05 deg
tp 2458433.306664654021
(2018-Nov-10.80666465)
6.1097e-05 TDB
period 1687.073420918476
4.62
1.3401e-05
3.669e-08
d
yr
n .2133872749912739 1.695e-09 deg/d
Q 3.227128649759042 1.7089e-08 au
  Orbit Determination Parameters
   # obs. used (total)      817  
   data-arc span      8445 days (23.12 yr)  
   first obs. used      1997-03-04  
   last obs. used      2020-04-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55168  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 16:35:52  

Additional Information
 Earth MOID = 1.32624 au 
 Jupiter MOID = 2.21281 au 
 T_jup = 3.314 
[ 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 15.4   n/a MPO453347  
diameter diameter 2.228 km 0.530 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.296   0.131 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

90905 (1997 EJ21)          Discovered 1997-Mar-04 by Spacewatch at Kitt Peak
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

[ show close-approach data ]
Alternate Designations
 1997 EJ21 = 2000 YJ84 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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