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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1639823148091547 4.2927e-08  
a 2.772422441490789 1.3451e-08 au
q 2.317794191906281 1.1936e-07 au
i 3.239690891135182 4.8909e-06 deg
node 174.6262033269172 6.0274e-05 deg
peri 216.3347969576147 6.1229e-05 deg
M 205.6215368602039 1.1378e-05 deg
tp 2460119.555689276001
(2023-Jun-24.05568928)
5.555e-05 TDB
period 1686.116332843967
4.62
1.2271e-05
3.36e-08
d
yr
n .2135083997394114 1.5539e-09 deg/d
Q 3.227050691075297 1.5657e-08 au
  Orbit Determination Parameters
   # obs. used (total)      886  
   data-arc span      8865 days (24.27 yr)  
   first obs. used      1997-03-04  
   last obs. used      2021-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53824  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 18:16:51  

Additional Information
 Earth MOID = 1.32351 au 
 Jupiter MOID = 2.21525 au 
 T_jup = 3.315 
[ 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 15.48   n/a E2021B10  
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

Alternate Designations
 1997 EJ21 = 2000 YJ84 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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