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101218 (1998 SR54)
Classification: Main-belt Asteroid          SPK-ID: 2101218
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1724232292732598 3.7332e-08  
a 2.641837892068962 1.5121e-08 au
q 2.18632367150197 9.6318e-08 au
i 12.17931569314926 4.6946e-06 deg
node 187.9922057415006 1.7894e-05 deg
peri 92.6038386496956 2.3867e-05 deg
M 124.4331927050802 1.8157e-05 deg
tp 2458658.385007638196
(2019-Jun-23.88500764)
7.6188e-05 TDB
period 1568.403036260611
4.29
1.3466e-05
3.687e-08
d
yr
n .2295328379740406 1.9707e-09 deg/d
Q 3.097352112635953 1.7728e-08 au
  Orbit Determination Parameters
   # obs. used (total)      742  
   data-arc span      8180 days (22.40 yr)  
   first obs. used      1998-09-16  
   last obs. used      2021-02-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .60594  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 15:35:46  

Additional Information
 Earth MOID = 1.20997 au 
 Jupiter MOID = 2.15441 au 
 T_jup = 3.342 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.2   n/a MPO436472  
diameter diameter 2.076 km 0.315 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.341   0.076 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

101218 (1998 SR54)          Discovered 1998-Sep-16 by LONEOS at Anderson Mesa
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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