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90487 Witherspoon (2004 DW12)
Classification: Outer Main-belt Asteroid          SPK-ID: 2090487
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01510095254565518 4.0438e-08  
a 3.237602025368895 3.1003e-08 au
q 3.188711150822082 1.33e-07 au
i 21.38572006300783 5.6569e-06 deg
node 162.4250400072309 1.2106e-05 deg
peri 111.0106955386137 0.00025954 deg
M 254.4410040061129 0.00026429 deg
tp 2460020.416357039454
(2023-Mar-16.91635704)
0.001567 TDB
period 2127.813801366684
5.83
3.0563e-05
8.368e-08
d
yr
n .1691877361490811 2.4302e-09 deg/d
Q 3.286492899915708 3.1471e-08 au
  Orbit Determination Parameters
   # obs. used (total)      819  
   data-arc span      8482 days (23.22 yr)  
   first obs. used      1998-03-20  
   last obs. used      2021-06-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54195  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 23:38:18  

Additional Information
 Earth MOID = 2.20314 au 
 Jupiter MOID = 1.7486 au 
 T_jup = 3.076 
[ 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 14.51   n/a MPCxxxxx  
diameter diameter 7.319 km 0.107 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.060   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

90487 Witherspoon           Discovered 2004 Feb. 16 by the Catalina Sky Survey.
Tom Witherspoon Sr. (1921-2014) was a well known fossil educator in the Midwest U.S. Thousands of people, not just children, were introduced to the world of paleontology through his efforts and generosity. In 2007 he received the Charles H. Sternberg award for outstanding lifetime achievement in the field of paleontology.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2015-03-05Last Updated: 2015-03-09

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Alternate Designations
 2004 DW12 = 1998 FB133 = 1999 KW2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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