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390929 (2005 GP21)
Classification: Apollo [NEO, PHA]          SPK-ID: 2390929
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 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2245001056982588 9.9711e-07  
a 1.308321445481584 8.4678e-09 au
q 1.01460314268367 1.3102e-06 au
i 18.80269144893276 5.6034e-05 deg
node 10.00391685726026 1.1512e-05 deg
peri 1.387114241870485 0.00034657 deg
M 221.8859591419739 0.00052647 deg
tp 2459210.203388570899
(2020-Dec-26.70338857)
0.00079883 TDB
period 546.6006165377963
1.50
5.3066e-06
1.453e-08
d
yr
n .6586161616140562 6.3941e-09 deg/d
Q 1.602039748279499 1.0369e-08 au
  Orbit Determination Parameters
   # obs. used (total)      262  
   data-arc span      5516 days (15.10 yr)  
   first obs. used      2005-04-04  
   last obs. used      2020-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      1  
   norm. resid. RMS      .45896  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-02 06:30:42  

Additional Information
 Earth MOID = .0147134 au 
 Jupiter MOID = 3.86085 au 
 T_jup = 4.902 
[ 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 20.5   n/a MPO294766  

390929 (2005 GP21)          Discovered 2005-Apr-04 by Mt. Lemmon Survey at Mount Lemmon
Reference: Last Updated: 2014-04-17

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