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18702 Sadowski (1998 HG68)
Classification: Main-belt Asteroid          SPK-ID: 2018702
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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .184922836065561 4.8744e-08  
a 2.551450493749189 1.1482e-08 au
q 2.079629032364213 1.2576e-07 au
i 4.216429175804753 9.2057e-06 deg
node 336.6385306435674 6.1908e-05 deg
peri 132.6427601772483 7.1362e-05 deg
M 231.7187404055865 3.06e-05 deg
tp 2459530.944390181743
(2021-Nov-12.44439018)
0.00012598 TDB
period 1488.603877676173
4.08
1.0049e-05
2.751e-08
d
yr
n .2418373385954013 1.6325e-09 deg/d
Q 3.023271955134165 1.3606e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1260  
   data-arc span      14172 days (38.80 yr)  
   first obs. used      1979-08-22  
   last obs. used      2018-06-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49563  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Oct-03 17:50:27  

Additional Information
 Earth MOID = 1.09901 au 
 Jupiter MOID = 2.10166 au 
 T_jup = 3.412 
[ 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 14.4   n/a MPO384914  
diameter diameter 4.058 km 0.298 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.224   0.042 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18702 Sadowski           Discovered 1998 Apr. 21 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
John Paul Sadowski (b. 1984) was awarded third place in the 2003 Intel International Science and Engineering Fair for his chemistry project. He attends the North Shore High School, Glen Head, New York, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040830/MPCPages.arcLast Updated: 2004-09-06

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Alternate Designations
 1998 HG68 = 1979 QK3 = 1991 PC22 = 1992 WW7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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