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1721 Wells (1953 TD3)
Classification: Main-belt Asteroid          SPK-ID: 2001721
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04870218894860548 4.1424e-08  
a 3.145578701299998 1.6534e-08 au
q 2.992382133036577 1.3058e-07 au
i 16.12287546504092 5.8725e-06 deg
node 317.0975821709769 1.4782e-05 deg
peri 138.1826642739304 5.9977e-05 deg
M 277.5631571536661 5.9047e-05 deg
tp 2459467.125115377847
(2021-Sep-09.62511538)
0.0003353 TDB
period 2037.742297447717
5.58
1.6067e-05
4.399e-08
d
yr
n .1766661076088482 1.3929e-09 deg/d
Q 3.29877526956342 1.734e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2152  
   data-arc span      41979 days (114.93 yr)  
   first obs. used      1905-02-09  
   last obs. used      2020-01-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40478  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:02:59  

Additional Information
 Earth MOID = 2.02489 au 
 Jupiter MOID = 1.79908 au 
 T_jup = 3.146 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456468.5 (2013-Jun-25.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04568253260492318 4.0235e-08  
q 3.005224244222231 1.2626e-07 au
tp 2457410.688102625412
(2016-Jan-23.18810263)
0.00036204 TDB
node 317.3513752048178 1.4761e-05 deg
peri 134.9702949882631 6.5227e-05 deg
i 16.12368970335519 5.8747e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2152  
   data-arc span      41979 days (114.93 yr)  
   first obs. used      1905-02-09  
   last obs. used      2020-01-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40478  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:02:59  

Additional Information
 Jupiter MOID = 1.79908 au 
 T_jup = 3.146 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.618882674844808E-15 -5.038701807957855E-15 5.206313765449758E-12 -1.676307311755411E-15 9.035866531879898E-13 -1.192277805385804E-15
q -5.038701807957855E-15 1.59412083413781E-14 -1.470108587880293E-11 7.094723616153315E-15 -2.572515463373264E-12 4.959625022074093E-15
tp 5.206313765449758E-12 -1.470108587880293E-11 1.310698299070839E-7 2.679636439643369E-11 2.301410585693883E-8 -1.980124864664558E-11
node -1.676307311755411E-15 7.094723616153315E-15 2.679636439643369E-11 2.178757805531496E-10 -2.040619362529857E-10 1.720816010538349E-11
peri 9.035866531879898E-13 -2.572515463373264E-12 2.301410585693883E-8 -2.040619362529857E-10 4.254574535962544E-9 -2.015914501002823E-11
i -1.192277805385804E-15 4.959625022074093E-15 -1.980124864664558E-11 1.720816010538349E-11 -2.015914501002823E-11 3.451252650406352E-11

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 10.9   n/a MPO502170  
diameter diameter 43.576 km 0.166 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.045   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1721 Wells (1953 TD3)          Discovered 1953-Oct-03 by Goethe Link Observatory at Brooklyn
Discovered by the Indiana Asteroid Program, Goethe Link Observatory, University of Indiana. This program was conceived and directed by F. K. Edmondson; the plates were blinked and measured astrometrically by B. Potter and, following her retirement, by D. Owings; and the photometry was performed under the direction of T. Gehrels. During the years 1947-1967, in which the plates were exposed, a large number of people participated in various aspects of the program.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1953 TD3 = 1944 DA = 1958 QE = A905 CG 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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