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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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04870217624427505 3.1434e-08  
a 3.145578697434633 1.3846e-08 au
q 2.992382169321934 1.0598e-07 au
i 16.12287895661052 2.9023e-06 deg
node 317.097581144996 1.4672e-05 deg
peri 138.1826503451068 5.0189e-05 deg
M 277.5631736220257 4.6662e-05 deg
tp 2459467.125021300322
(2021-Sep-09.62502130)
0.00026393 TDB
period 2037.742293691675
5.58
1.3455e-05
3.684e-08
d
yr
n .1766661079344857 1.1665e-09 deg/d
Q 3.298775225547331 1.4521e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2808  
   data-arc span      42284 days (115.77 yr)  
   first obs. used      1905-02-09  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36883  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:02:20  

Additional Information
 Earth MOID = 2.02489 au 
 Jupiter MOID = 1.79908 au 
 T_jup = 3.146 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457904.5 (2017-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04617648114009815 3.1235e-08  
q 3.00464667250599 1.0463e-07 au
tp 2457421.905548474312
(2016-Feb-03.40554847)
0.0002837 TDB
node 317.326195323756 1.4664e-05 deg
peri 137.1542298767448 5.3206e-05 deg
i 16.11355293330838 2.9072e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2808  
   data-arc span      42284 days (115.77 yr)  
   first obs. used      1905-02-09  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36883  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:02:20  

Additional Information
 Jupiter MOID = 1.79908 au 
 T_jup = 3.146 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.756168517866599E-16 -3.247863227074403E-15 -2.141243080139293E-13 -1.515457686745002E-15 5.653233914616616E-15 -3.100448195362245E-15
q -3.247863227074403E-15 1.094745309586929E-14 2.062162716200045E-13 9.875423109100107E-15 -1.079363814232133E-13 1.068429430770631E-14
tp -2.141243080139293E-13 2.062162716200045E-13 8.048757120722669E-8 3.985505274084927E-11 1.453857235674273E-8 4.945892219502429E-11
node -1.515457686745002E-15 9.875423109100107E-15 3.985505274084927E-11 2.150293249454035E-10 -1.990205607799569E-10 1.75114661424291E-11
peri 5.653233914616616E-15 -1.079363814232133E-13 1.453857235674273E-8 -1.990205607799569E-10 2.830861404418811E-9 -8.006089238318621E-12
i -3.100448195362245E-15 1.068429430770631E-14 4.945892219502429E-11 1.75114661424291E-11 -8.006089238318621E-12 8.451741956810053E-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

[ 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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