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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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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 
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Orbital Elements at Epoch 2457785.5 (2017-Feb-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0460023327376761 3.1423e-08  
q 3.003969929100065 1.0501e-07 au
tp 2457419.477899645710
(2016-Jan-31.97789965)
0.00028666 TDB
node 317.3446102349735 1.4687e-05 deg
peri 136.6732636321362 5.3734e-05 deg
i 16.12011832912228 3.1258e-06 deg
  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
 Jupiter MOID = 1.79908 au 
 T_jup = 3.146 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.873828438342089E-16 -3.278979977204015E-15 -1.352928744722221E-13 -1.436431650353101E-15 1.786637615092885E-14 -2.76249136791654E-15
q -3.278979977204015E-15 1.102767555449575E-14 9.226075247069937E-15 8.871790713932862E-15 -1.369943082689583E-13 9.817075493368063E-15
tp -1.352928744722221E-13 9.226075247069937E-15 8.217615301609103E-8 3.418368502242014E-11 1.484537417518448E-8 4.466653547639283E-11
node -1.436431650353101E-15 8.871790713932862E-15 3.418368502242014E-11 2.157157663740843E-10 -2.00665112608227E-10 1.859147264340159E-11
peri 1.786637615092885E-14 -1.369943082689583E-13 1.484537417518448E-8 -2.00665112608227E-10 2.887374960689967E-9 -9.887820335953518E-12
i -2.76249136791654E-15 9.817075493368063E-15 4.466653547639283E-11 1.859147264340159E-11 -9.887820335953518E-12 9.770590058513238E-12

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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