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JPL Small-Body Database Browser
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1961 Dufour (1973 WA)
Classification: Main-belt Asteroid          SPK-ID: 2001961
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 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1245994034693096 3.1799e-08  
a 3.193495144732454 1.4258e-08 au
q 2.795587554716653 1.0453e-07 au
i 6.647918197637043 4.3606e-06 deg
node 29.57712696087404 2.9491e-05 deg
peri 56.67314116607877 3.4103e-05 deg
M .1990112258940948 1.6888e-05 deg
tp 2458999.347680552791
(2020-May-29.84768055)
9.7786e-05 TDB
period 2084.480406226279
5.71
1.396e-05
3.822e-08
d
yr
n .172704909542297 1.1566e-09 deg/d
Q 3.591402734748254 1.6034e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3755  
   data-arc span      20855 days (57.10 yr)  
   first obs. used      1962-12-31  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .35769  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:09:10  

Additional Information
 Earth MOID = 1.81868 au 
 Jupiter MOID = 1.67631 au 
 T_jup = 3.174 
[ 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 10.8   n/a MPO502172  
diameter diameter 50.31 km 1.6 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 20
rotation period rot_per 15.79 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.0402   0.003 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 20

1961 Dufour (1973 WA)          Discovered 1973-Nov-19 by Wild, P. at Zimmerwald
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
1915-Nov-09 12:02 00:03 Jupiter 1.9512562359621 1.95125543165656 1.95125704026885 4.19764085845736 4.09292157729348 2420811.001265497 2.54315291300408 107.152557451852 22.0148038705053 76.0404827139742 3111621.18641226 T 45 CATAB v2.0f-lin.ifort 2020-Feb-22 16:09:25 2020-Feb-22 16:09
1926-Nov-18 19:47 00:02 Jupiter 1.84589500464637 1.84589446033423 1.84589554895903 3.27363970660337 3.13033233558505 2424838.324421793 2.2746810732703 82.3728353937256 14.6446943719053 84.7377977342529 2610695.64269132 T 45 CATAB v2.0f-lin.ifort 2020-Feb-22 16:09:25 2020-Feb-22 16:09
1937-Dec-04 18:57 00:02 Jupiter 1.79018052330814 1.79018012294566 1.79018092367068 2.53161844964316 2.33726197447238 2428872.289663136 1.95146172686368 58.5722633900185 15.9379036162425 -89.8524420860638 2688259.35948955 T 45 CATAB v2.0f-lin.ifort 2020-Feb-22 16:09:25 2020-Feb-22 16:09
1948-Dec-29 03:38 00:02 Jupiter 1.78250001265502 1.78249962440074 1.7825004009093 2.23363580251576 2.00966490010438 2432914.651127621 1.58803562593023 58.3165552092725 10.5870218108416 82.3645404267479 3720929.01617449 T 45 CATAB v2.0f-lin.ifort 2020-Feb-22 16:09:25 2020-Feb-22 16:09
1960-Feb-02 14:39 00:01 Jupiter 1.82799140010279 1.82799098296122 1.82799181724426 2.43445535651064 2.23603399934236 2436967.110237531 1.23020596999041 48.4776854499028 5.83691799837154 77.7427711817519 2866431.346306 T 45 CATAB v2.0f-lin.ifort 2020-Feb-22 16:09:25 2020-Feb-22 16:09
1971-Mar-15 01:59 < 00:01 Jupiter 1.91925915997724 1.91925873150897 1.91925958844552 2.90186383498775 2.74557061824795 2441025.582893157 0.914388534659659 46.9138509912219 10.4392892685494 77.7256949862805 2979466.56325923 T 45 CATAB v2.0f-lin.ifort 2020-Feb-22 16:09:25 2020-Feb-22 16:09
2081-Oct-29 10:59 00:01 Jupiter 1.87678690712779 1.87678640833912 1.87678740591656 3.82071685430415 3.70070896174369 2481431.957670379 1.25232408021326 65.7859078259695 18.9490062906104 84.0318812348969 3176406.88205543 T 45 CATAB v2.0f-lin.ifort 2020-Feb-22 16:09:25 2020-Feb-22 16:09
2092-Nov-13 12:00 00:01 Jupiter 1.78028278256191 1.78028235602248 1.78028320910134 2.97816827246186 2.81388108103583 2485465.000273566 1.4845972060047 60.7360993975196 13.2666374680615 88.1221854444684 2600591.08562794 T 45 CATAB v2.0f-lin.ifort 2020-Feb-22 16:09:25 2020-Feb-22 16:09
2103-Dec-06 12:38 00:02 Jupiter 1.7531916666806 1.75319128780929 1.75319204555181 2.36016367542361 2.14571878934066 2489504.026397764 1.74415098906244 54.0712056742596 20.7309005279185 -88.06377889788 2744087.0135191 T 45 CATAB v2.0f-lin.ifort 2020-Feb-22 16:09:25 2020-Feb-22 16:09
2115-Jan-03 11:08 00:02 Jupiter 1.78282986758591 1.78282940769247 1.78283032747925 2.19863898548724 1.97073928697232 2493549.963752247 2.01913875491919 60.0668227774744 15.8143054308358 87.1285168161084 3619825.31579933 T 45 CATAB v2.0f-lin.ifort 2020-Feb-22 16:09:25 2020-Feb-22 16:09
2126-Feb-05 03:08 00:02 Jupiter 1.86083436135773 1.86083370243074 1.86083502028451 2.52003640584788 2.3324268396766 2497600.630483626 2.289436919765 48.0147665449839 14.7407330570475 83.2986702440117 2065603.3603705 T 45 CATAB v2.0f-lin.ifort 2020-Feb-22 16:09:25 2020-Feb-22 16:09
2137-Mar-15 00:46 00:03 Jupiter 1.9775231148416 1.97752224341504 1.97752398626804 3.09417618620703 2.9525034029563 2501656.531898156 2.54956154214182 53.6735070883866 20.5120534641922 63.3087448064981 1879317.23087335 T 45 CATAB v2.0f-lin.ifort 2020-Feb-22 16:09:25 2020-Feb-22 16:09

Alternate Designations
 1973 WA = 1927 UM = 1952 BQ1 = 1962 YG = 1969 AH = 1973 SY3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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