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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 ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04870217976699914 3.1663e-08  
a 3.145578698629442 1.3907e-08 au
q 2.992382159377548 1.0652e-07 au
i 16.12287895165709 3.12e-06 deg
node 317.0975811289226 1.4703e-05 deg
peri 138.1826549300526 5.046e-05 deg
M 277.5631685964943 4.6982e-05 deg
tp 2459467.125050012678
(2021-Sep-09.62505001)
0.00026577 TDB
period 2037.742294852692
5.58
1.3513e-05
3.7e-08
d
yr
n .1766661078338291 1.1716e-09 deg/d
Q 3.298775237881336 1.4584e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2731  
   data-arc span      42266 days (115.72 yr)  
   first obs. used      1905-02-09  
   last obs. used      2020-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .37264  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:16:08  

Additional Information
 Earth MOID = 2.02489 au 
 Jupiter MOID = 1.79908 au 
 T_jup = 3.146 
[ 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 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

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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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