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31268 Welty (1998 FA)
Classification: Main-belt Asteroid          SPK-ID: 2031268
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1277349165737915 4.5847e-08  
a 2.636910251440348 1.0525e-08 au
q 2.30008474046004 1.1826e-07 au
i 10.29576894053064 4.1472e-06 deg
node 92.17761671099296 2.1762e-05 deg
peri 22.28345532198335 2.831e-05 deg
M 105.2885885370741 1.7427e-05 deg
tp 2458543.074625042022
(2019-Feb-28.57462504)
7.4655e-05 TDB
period 1564.016929782354
4.28
9.3642e-06
2.564e-08
d
yr
n .230176536548167 1.3781e-09 deg/d
Q 2.973735762420657 1.187e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1589  
   data-arc span      8251 days (22.59 yr)  
   first obs. used      1997-12-17  
   last obs. used      2020-07-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53698  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:01:58  

Additional Information
 Earth MOID = 1.32009 au 
 Jupiter MOID = 2.15719 au 
 T_jup = 3.363 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457059.5 (2015-Feb-06.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1288164282694999 4.5774e-08  
q 2.298222492679633 1.1832e-07 au
tp 2456980.703343789044
(2014-Nov-19.20334379)
7.1137e-05 TDB
node 92.21526189585896 2.1754e-05 deg
peri 22.67945131588741 2.8216e-05 deg
i 10.29718966395556 4.1477e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1589  
   data-arc span      8251 days (22.59 yr)  
   first obs. used      1997-12-17  
   last obs. used      2020-07-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53698  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:01:58  

Additional Information
 Jupiter MOID = 2.15719 au 
 T_jup = 3.363 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.095299496285034E-15 -5.401501093531292E-15 -4.130138670308551E-13 2.221127798366822E-14 -2.241924480497461E-13 -1.761614757050253E-15
q -5.401501093531292E-15 1.400013223664704E-14 1.243028468415583E-12 -5.834624567947526E-14 6.22432773394306E-13 4.415154647952425E-15
tp -4.130138670308551E-13 1.243028468415583E-12 5.060464897847844E-9 -1.81505106814795E-11 1.279557482166084E-9 -4.843237661702056E-12
node 2.221127798366822E-14 -5.834624567947526E-14 -1.81505106814795E-11 4.732469565488083E-10 -4.70878846226116E-10 -7.578501910690557E-12
peri -2.241924480497461E-13 6.22432773394306E-13 1.279557482166084E-9 -4.70878846226116E-10 7.961680608373736E-10 6.347592575394429E-12
i -1.761614757050253E-15 4.415154647952425E-15 -4.843237661702056E-12 -7.578501910690557E-12 6.347592575394429E-12 1.720328033203059E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.9   n/a MPO474164  
diameter diameter 4.195 km 0.081 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.364   0.068 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

31268 Welty           Discovered 1998 Mar. 16 by I. P. Griffin at Cocoa.
Sandra Welty (b. 1969) is a high-school teacher of English at Kenwood High School, Baltimore County, Maryland. Over her career she has been an inspiring teacher for many students.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20070601/MPCPages.arcLast Updated: 2007-06-06
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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