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18876 Sooner (1999 XM)
Classification: Main-belt Asteroid          SPK-ID: 2018876
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2425860226885109 4.42e-08  
a 2.41206303750251 8.7019e-09 au
q 1.826930258760808 1.0518e-07 au
i 8.846889711560591 4.631e-06 deg
node 75.51780496565877 3.5053e-05 deg
peri 356.7230439104696 3.6695e-05 deg
M 67.07814684533876 1.2526e-05 deg
tp 2458345.547096399650
(2018-Aug-15.04709640)
4.6908e-05 TDB
period 1368.300252953454
3.75
7.4045e-06
2.027e-08
d
yr
n .2631001486866248 1.4238e-09 deg/d
Q 2.997195816244213 1.0813e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1146  
   data-arc span      15041 days (41.18 yr)  
   first obs. used      1978-03-03  
   last obs. used      2019-05-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4987  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 02:38:46  

Additional Information
 Earth MOID = .84161 au 
 Jupiter MOID = 2.30036 au 
 T_jup = 3.463 
[ 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 14.5   n/a MPO381415  
diameter diameter 3.067 km 0.042 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.322   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

18876 Sooner           Discovered 1999 Dec. 2 by J. M. Roe at Oaxaca.
A sooner is a person settling on land in the early American west before the land was officially open to settlement. The name particularly honors the U.S. state of Oklahoma and the University of Oklahoma, alma mater of the discoverer.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020328/MPCPages.arcLast Updated: 2003-10-02

Alternate Designations
 1999 XM = 1978 ES8 = 1984 YF2 = 1984 YP1 = 1997 JS 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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