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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1273302138985337 4.5504e-08  
a 2.638072474795414 1.038e-08 au
q 2.30216614229988 1.1753e-07 au
i 10.29410405872797 4.1449e-06 deg
node 92.17965319614564 2.1639e-05 deg
peri 22.41208987510819 2.8246e-05 deg
M 151.1870324263158 1.7494e-05 deg
tp 2458543.234929985748
(2019-Feb-28.73492999)
7.4511e-05 TDB
period 1565.05105899509
4.28
9.237e-06
2.529e-08
d
yr
n .2300244442064106 1.3576e-09 deg/d
Q 2.973978807290948 1.1702e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1605  
   data-arc span      8251 days (22.59 yr)  
   first obs. used      1997-12-17  
   last obs. used      2020-07-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5348  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 06:47:47  

Additional Information
 Earth MOID = 1.32208 au 
 Jupiter MOID = 2.15628 au 
 T_jup = 3.362 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457065.5 (2015-Feb-12.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1288200800509921 4.5461e-08  
q 2.298213480056086 1.1761e-07 au
tp 2456980.688985973590
(2014-Nov-19.18898597)
7.0759e-05 TDB
node 92.21466778126981 2.1631e-05 deg
peri 22.67563205739382 2.8096e-05 deg
i 10.29709103090828 4.1461e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1605  
   data-arc span      8251 days (22.59 yr)  
   first obs. used      1997-12-17  
   last obs. used      2020-07-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5348  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 06:47:47  

Additional Information
 Jupiter MOID = 2.15628 au 
 T_jup = 3.362 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.066689560354749E-15 -5.332241882562922E-15 -4.5176093248464E-13 2.215923667056369E-14 -2.310752373534331E-13 -1.704398052001722E-15
q -5.332241882562922E-15 1.383249648144245E-14 1.337146047256325E-12 -5.826101533665002E-14 6.391967801977299E-13 4.274920351723712E-15
tp -4.5176093248464E-13 1.337146047256325E-12 5.00689108628995E-9 -1.851019260119513E-11 1.270271232936065E-9 -4.748238638476668E-12
node 2.215923667056369E-14 -5.826101533665002E-14 -1.851019260119513E-11 4.678876462133868E-10 -4.656875029947124E-10 -7.322619733053181E-12
peri -2.310752373534331E-13 6.391967801977299E-13 1.270271232936065E-9 -4.656875029947124E-10 7.894026045481623E-10 6.113869663823383E-12
i -1.704398052001722E-15 4.274920351723712E-15 -4.748238638476668E-12 -7.322619733053181E-12 6.113869663823383E-12 1.719055836401043E-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 13.90   n/a MPCxxxxx  
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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