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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 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04907437532340801 1.9927e-08  
a 3.146889955178422 1.0852e-08 au
q 2.992458296416533 6.5919e-08 au
i 16.12276754098469 2.7394e-07 deg
node 317.0965715783394 9.6939e-07 deg
peri 137.9310993703032 2.5079e-05 deg
M 347.7704050698044 2.2547e-05 deg
tp 2459465.767630706194
(2021-Sep-08.26763071)
0.00012762 TDB
period 2039.016598387939
5.58
1.0547e-05
2.888e-08
d
yr
n .176555698607171 9.1329e-10 deg/d
Q 3.30132161394031 1.1385e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3143  
   data-arc span      42550 days (116.50 yr)  
   first obs. used      1905-02-09  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3586  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 15:46:34  

Additional Information
 Earth MOID = 2.0256 au 
 Jupiter MOID = 1.79688 au 
 T_jup = 3.146 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457981.5 (2017-Aug-16.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04630951734808014 1.9811e-08  
q 3.004871114656074 6.5256e-08 au
tp 2457423.378418533515
(2016-Feb-04.87841853)
0.00014278 TDB
node 317.3009201120189 9.6061e-07 deg
peri 137.4501244343058 2.7179e-05 deg
i 16.10856847079388 2.7394e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3143  
   data-arc span      42550 days (116.50 yr)  
   first obs. used      1905-02-09  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3586  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 15:46:34  

Additional Information
 Jupiter MOID = 1.79688 au 
 T_jup = 3.146 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.924754842759252E-16 -1.2768922122326E-15 2.202250937178131E-12 -2.472932499404848E-15 4.354188620598196E-13 -1.676470552567717E-16
q -1.2768922122326E-15 4.258280882711411E-15 -7.382746922840974E-12 8.082584529380082E-15 -1.458362286546159E-12 3.167778980838082E-16
tp 2.202250937178131E-12 -7.382746922840974E-12 2.038588842124744E-8 4.579248092762044E-11 3.873069083455236E-9 3.86510263817085E-12
node -2.472932499404848E-15 8.082584529380082E-15 4.579248092762044E-11 9.227647681495294E-13 7.374943474074772E-12 2.928767076591115E-14
peri 4.354188620598196E-13 -1.458362286546159E-12 3.873069083455236E-9 7.374943474074772E-12 7.387183881864271E-10 5.566022734114107E-13
i -1.676470552567717E-16 3.167778980838082E-16 3.86510263817085E-12 2.928767076591115E-14 5.566022734114107E-13 7.504248933261555E-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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1902-Jan-03 20:59 00:02 Jupiter 1.9355566612235 1.93555588698433 1.93555743547214 5.13866173441354 5.05278346474153 2415753.374363483 1.59447717214024 223.167890961345 7.56705032931441 80.0301290849733 10930875.7810043 T 44 CATAB v2.0g-lin.ifort 2021-Aug-24 15:48:18 2021-Aug-24 15:48
1986-Apr-28 23:56 < 00:01 Jupiter 1.87869213336616 1.87869184388334 1.87869242284972 5.21565868607109 5.12848715044598 2446549.497468620 0.426565569964068 72.4565098526693 7.20561650229699 80.3590386229857 35372158.7039097 T 44 CATAB v2.0g-lin.ifort 2021-Aug-24 15:48:18 2021-Aug-24 15:48
1996-Dec-20 03:33 < 00:01 Jupiter 1.92271575093674 1.92271554166169 1.92271596021189 5.19788425928679 5.11242915728407 2450437.647592830 0.274456007027741 38.9342299411052 7.44227711988155 79.9577129435507 11151773.2231631 T 44 CATAB v2.0g-lin.ifort 2021-Aug-24 15:48:18 2021-Aug-24 15:48
2081-Apr-15 13:09 < 00:01 Jupiter 1.88862360544318 1.88862312865896 1.88862408222891 5.13252977232648 5.04439178934482 2481235.047976956 0.994629270692653 94.8232526577624 9.02044820993301 76.454339091339 22127056.4312614 T 44 CATAB v2.0g-lin.ifort 2021-Aug-24 15:48:18 2021-Aug-24 15:48
2091-Dec-06 22:04 00:01 Jupiter 1.89821813335787 1.89821769887062 1.898218567849 5.23525469056039 5.14931569045632 2485122.419359619 1.11046377050202 148.51075853733 7.49928442369816 82.0241251905112 11309198.9420792 T 44 CATAB v2.0g-lin.ifort 2021-Aug-24 15:48:18 2021-Aug-24 15:48
2176-Apr-04 14:13 00:02 Jupiter 1.91058628231383 1.91058529682822 1.91058726780617 5.04915577207782 4.96057573359487 2515922.092271411 2.41848976054155 190.378051128271 9.79475613565603 74.8239387707892 10862815.6021239 T 44 CATAB v2.0g-lin.ifort 2021-Aug-24 15:48:18 2021-Aug-24 15:48
2186-Nov-23 08:40 00:02 Jupiter 1.88246347986142 1.88246264263228 1.88246431711238 5.26474616418759 5.17857544129582 2519806.861298328 2.4336472328447 331.274258275304 7.5893837466512 82.778588634404 11513666.5802062 T 44 CATAB v2.0g-lin.ifort 2021-Aug-24 15:48:18 2021-Aug-24 15:48

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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