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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04907437532959891 1.9927e-08  
a 3.146889955176346 1.0853e-08 au
q 2.992458296395077 6.5921e-08 au
i 16.12276754098152 2.7394e-07 deg
node 317.0965715783282 9.694e-07 deg
peri 137.9310993665005 2.5079e-05 deg
M 347.7704050755178 2.2547e-05 deg
tp 2459465.767630673765
(2021-Sep-08.26763067)
0.00012762 TDB
period 2039.016598385921
5.58
1.0548e-05
2.888e-08
d
yr
n .1765556986073458 9.1336e-10 deg/d
Q 3.301321613957615 1.1386e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3139  
   data-arc span      42429 days (116.16 yr)  
   first obs. used      1905-02-09  
   last obs. used      2021-04-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .35883  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:42:55  

Additional Information
 Earth MOID = 2.0256 au 
 Jupiter MOID = 1.79688 au 
 T_jup = 3.146 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457980.5 (2017-Aug-15.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04630769599927103 1.981e-08  
q 3.004869571397196 6.525e-08 au
tp 2457423.359756387312
(2016-Feb-04.85975639)
0.0001428 TDB
node 317.3013248390508 9.606e-07 deg
peri 137.4463586114058 2.7183e-05 deg
i 16.10863092251794 2.7394e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3139  
   data-arc span      42429 days (116.16 yr)  
   first obs. used      1905-02-09  
   last obs. used      2021-04-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .35883  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:42:55  

Additional Information
 Jupiter MOID = 1.79688 au 
 T_jup = 3.146 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.924302602951685E-16 -1.276698358085992E-15 2.202412266816107E-12 -2.472835915151133E-15 4.354495844245227E-13 -1.678534106521055E-16
q -1.276698358085992E-15 4.257498560892807E-15 -7.382956903195981E-12 8.082785169454461E-15 -1.45840192450116E-12 3.175320278888959E-16
tp 2.202412266816107E-12 -7.382956903195981E-12 2.039094368762959E-8 4.579601726814665E-11 3.874044163140776E-9 3.863960699705357E-12
node -2.472835915151133E-15 8.082785169454461E-15 4.579601726814665E-11 9.227508136368153E-13 7.375662191810505E-12 2.928717738454092E-14
peri 4.354495844245227E-13 -1.45840192450116E-12 3.874044163140776E-9 7.375662191810505E-12 7.389064180700234E-10 5.563733918338962E-13
i -1.678534106521055E-16 3.175320278888959E-16 3.863960699705357E-12 2.928717738454092E-14 5.563733918338962E-13 7.504320704303603E-14

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 10.97   n/a E2021B10  
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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