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(2017 SN21)
Classification: Apollo [NEO]          SPK-ID: 3782058
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 1 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .266974050864618 0.00049556  
a 1.282299683862056 0.00080417 au
q .9399589428389842 4.6366e-05 au
i 8.806166709810698 0.01386 deg
node 194.3806857111137 0.001348 deg
peri 232.5999686259287 0.013002 deg
M 265.2650042242332 0.57342 deg
tp 2459140.069547023362
(2020-Oct-17.56954702)
0.97609 TDB
period 530.3746151774577
1.45
0.49892
0.001366
d
yr
n .6787655172364307 0.00063851 deg/d
Q 1.624640424885129 0.0010189 au
  Orbit Determination Parameters
   # obs. used (total)      37  
   data-arc span      6 days  
   first obs. used      2017-09-30  
   last obs. used      2017-10-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      7  
   norm. resid. RMS      .38236  
   source      ORB  
   producer      Otto Matic  
   solution date      2017-Oct-07 15:42:11  

Additional Information
 Earth MOID = .0179309 au 
 Jupiter MOID = 3.6841 au 
 T_jup = 5.003 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 26.0   n/a MPO421453  

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