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227964 (2007 HE21)
Classification: Main-belt Asteroid          SPK-ID: 2227964
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07808378567295642 7.1826e-08  
a 2.797143521576959 2.8197e-08 au
q 2.578731966341645 1.9412e-07 au
i 1.335430610393732 7.1079e-06 deg
node 18.73607218644753 0.00023687 deg
peri 326.6952109558318 0.00024047 deg
M 207.8196848482585 4.5754e-05 deg
tp 2459922.814829386680
(2022-Dec-09.31482939)
0.00022067 TDB
period 1708.718623167007
4.68
2.5838e-05
7.074e-08
d
yr
n .2106841905502041 3.1858e-09 deg/d
Q 3.015555076812273 3.0399e-08 au
  Orbit Determination Parameters
   # obs. used (total)      240  
   data-arc span      6004 days (16.44 yr)  
   first obs. used      2004-10-06  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55396  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 00:41:50  

Additional Information
 Earth MOID = 1.56954 au 
 Jupiter MOID = 2.30027 au 
 T_jup = 3.322 
[ 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 16.30   n/a E2021B55  

227964 (2007 HE21)          Discovered 2007-Apr-18 by Spacewatch at Kitt Peak
Reference: 20091202/Numbers.arcLast Updated: 2009-12-04

[ show close-approach data ]
Alternate Designations
 2007 HE21 = 2006 CM25 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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