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100042 (1991 SJ2)
Classification: Main-belt Asteroid          SPK-ID: 2100042
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 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2205036476056088 6.2548e-08  
a 2.416798157199349 1.4712e-08 au
q 1.883885348010379 1.4976e-07 au
i 8.263369157695642 5.944e-06 deg
node 319.4127554761971 3.3071e-05 deg
peri 14.95917710978308 3.5895e-05 deg
M 291.4813520952718 2.16e-05 deg
tp 2459461.695254426883
(2021-Sep-04.19525443)
8.4353e-05 TDB
period 1372.331393993976
3.76
1.2531e-05
3.431e-08
d
yr
n .2623273078030162 2.3954e-09 deg/d
Q 2.949710966388319 1.7957e-08 au
  Orbit Determination Parameters
   # obs. used (total)      546  
   data-arc span      10510 days (28.77 yr)  
   first obs. used      1991-08-08  
   last obs. used      2020-05-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53463  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 15:30:19  

Additional Information
 Earth MOID = .872959 au 
 Jupiter MOID = 2.42738 au 
 T_jup = 3.469 
[ 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 15.60   n/a E2021B55  
diameter diameter 2.397 km 0.158 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.177   0.041 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

100042 (1991 SJ2)          Discovered 1991-Sep-16 by Holt, H. E. at Palomar
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

[ show close-approach data ]
Alternate Designations
 1991 SJ2 = 1999 XJ186 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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