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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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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1554642587559863 7.1178e-08  
a 2.558439835652681 1.4618e-08 au
q 2.16069388303115 1.8545e-07 au
i 12.34090183943215 7.0213e-06 deg
node 356.6846926246876 2.6126e-05 deg
peri 304.3554067184539 3.0648e-05 deg
M 202.7269237965743 1.7323e-05 deg
tp 2459853.499908517416
(2022-Sep-30.99990852)
7.4689e-05 TDB
period 1494.724798046198
4.09
1.2811e-05
3.507e-08
d
yr
n .2408470110822858 2.0642e-09 deg/d
Q 2.956185788274213 1.6891e-08 au
  Orbit Determination Parameters
   # obs. used (total)      559  
   data-arc span      8162 days (22.35 yr)  
   first obs. used      1998-09-14  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57358  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 08:27:37  

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

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1960-Apr-11 05:00 00:01 Amphi 0.0465976371333902 0.0465956195434327 0.0465996571712462 4.29544812191459 4.29544809319352 2437035.708419152 1.08192109846344 740.679487162429 69.2632464820805 -84.322324606454 100108.75895485 T 21 CATAB v2.0f-lin.ifort 2021-Feb-24 08:27:38 2021-Feb-24 08:27
1964-May-12 21:18 00:01 Amphi 0.0482388621847341 0.0482355618809512 0.0482421654927447 4.23418681778971 4.23418678964441 2438528.387680322 1.03773496672264 681.702390151699 69.3150534077193 -77.2885671816432 101538.189928288 T 21 CATAB v2.0f-lin.ifort 2021-Feb-24 08:27:38 2021-Feb-24 08:27
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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