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312540 (2009 ER21)
Classification: Main-belt Asteroid          SPK-ID: 2312540
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1514309140417587 5.8868e-08  
a 2.261631194125866 2.1917e-08 au
q 1.919150315174032 1.334e-07 au
i 23.78345323644267 8.793e-06 deg
node 307.9429629593352 1.5595e-05 deg
peri 298.9804512931726 3.8103e-05 deg
M 52.64558581147082 3.9524e-05 deg
tp 2458818.826924966026
(2019-Dec-01.32692497)
0.00013552 TDB
period 1242.313215897017
3.40
1.8058e-05
4.944e-08
d
yr
n .2897819932955158 4.2123e-09 deg/d
Q 2.604112073077701 2.5236e-08 au
  Orbit Determination Parameters
   # obs. used (total)      189  
   data-arc span      6686 days (18.31 yr)  
   first obs. used      2002-02-07  
   last obs. used      2020-05-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55137  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-24 05:27:32  

Additional Information
 Earth MOID = .981775 au 
 Jupiter MOID = 2.7371 au 
 T_jup = 3.493 
[ 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 16.5   n/a MPO266787  
diameter diameter 3.191 km 0.083 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.044   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

312540 (2009 ER21)          Discovered 2009-Mar-15 by Siding Spring Survey at Siding Spring
Reference: 20120109/Numbers.arcLast Updated: 2012-01-11
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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