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227877 (2007 ER21)
Classification: Main-belt Asteroid          SPK-ID: 2227877
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .244355155339373 4.3171e-08  
a 2.665734204902083 1.5589e-08 au
q 2.014348309169755 1.1811e-07 au
i 3.594304962595936 4.2029e-06 deg
node 139.1499781963764 8.1339e-05 deg
peri 108.4942048442714 8.2014e-05 deg
M 16.63734166653347 9.0223e-06 deg
tp 2459127.030830865899
(2020-Oct-04.53083087)
3.9659e-05 TDB
period 1589.731185329865
4.35
1.3945e-05
3.818e-08
d
yr
n .2264533798683084 1.9864e-09 deg/d
Q 3.317120100634412 1.9398e-08 au
  Orbit Determination Parameters
   # obs. used (total)      429  
   data-arc span      9546 days (26.14 yr)  
   first obs. used      1994-04-02  
   last obs. used      2020-05-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .57373  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 00:41:30  

Additional Information
 Earth MOID = 1.00266 au 
 Jupiter MOID = 1.72953 au 
 T_jup = 3.337 
[ 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 16.27   n/a E2021B55  

227877 (2007 ER21)          Discovered 2007-Mar-10 by Spacewatch at Kitt Peak
Reference: 20091202/Numbers.arcLast Updated: 2009-12-04

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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