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101217 (1998 SG54)
Classification: Main-belt Asteroid          SPK-ID: 2101217
[ 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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1554642575362994 7.1172e-08  
a 2.558439834280084 1.4336e-08 au
q 2.160693884992438 1.8543e-07 au
i 12.34090189175257 7.018e-06 deg
node 356.6846940948083 2.5383e-05 deg
peri 304.3554052670264 2.9768e-05 deg
M 202.7269242450681 1.7226e-05 deg
tp 2459853.499906129764
(2022-Sep-30.99990613)		 7.4402e-05 TDB
period 1494.724796843323
4.09		 1.2563e-05
3.44e-08		 d
yr
n .2408470112761065 2.0243e-09 deg/d
Q 2.956185783567731 1.6564e-08 au
   Orbit Determination Parameters
   # obs. used (total)      611  
   data-arc span      8218 days (22.50 yr)  
   first obs. used      1998-09-14  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56907  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 15:35:46  

Additional Information
 Earth MOID = 1.17088 au 
 Jupiter MOID = 2.40201 au 
 T_jup = 3.387 
[ 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 15.4   n/a MPO449613  
diameter diameter 1.917 km 0.463 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.365   0.198 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

101217 (1998 SG54)          Discovered 1998-Sep-16 by LONEOS at Anderson Mesa
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

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