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308387 (2005 SW21)
Classification: Main-belt Asteroid          SPK-ID: 2308387
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 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2118785524439521 6.1057e-08  
a 3.194822689521148 4.3958e-08 au
q 2.517908282750314 1.8071e-07 au
i 15.4706650106327 9.2107e-06 deg
node 210.9389962862237 2.0518e-05 deg
peri 239.3959565856862 2.8882e-05 deg
M 155.1789474745804 1.9836e-05 deg
tp 2458101.418900222494
(2017-Dec-13.91890022)
0.00010993 TDB
period 2085.780327727263
5.71
4.3047e-05
1.179e-07
d
yr
n .172597274609579 3.5621e-09 deg/d
Q 3.871737096291983 5.3271e-08 au
  Orbit Determination Parameters
   # obs. used (total)      153  
   data-arc span      4970 days (13.61 yr)  
   first obs. used      2005-09-28  
   last obs. used      2019-05-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58583  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-25 18:17:09  

Additional Information
 Earth MOID = 1.57313 au 
 Jupiter MOID = 1.68501 au 
 T_jup = 3.105 
[ 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 15.9   n/a MPO433983  

308387 (2005 SW21)          Discovered 2005-Sep-28 by Birtwhistle, P. at Great Shefford
Reference: 20111210/Numbers.arcLast Updated: 2011-12-12

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