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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 ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .124599403651426 3.1817e-08  
a 3.193495145087613 1.436e-08 au
q 2.795587554445972 1.0455e-07 au
i 6.647918079364093 4.3799e-06 deg
node 29.57712805223177 2.9725e-05 deg
peri 56.67314038551708 3.4332e-05 deg
M .1990108023996144 1.7027e-05 deg
tp 2458999.347683004726
(2020-May-29.84768300)
9.859e-05 TDB
period 2084.480406574012
5.71
1.4059e-05
3.849e-08
d
yr
n .1727049095134864 1.1649e-09 deg/d
Q 3.591402735729253 1.6149e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3693  
   data-arc span      20825 days (57.02 yr)  
   first obs. used      1962-12-31  
   last obs. used      2020-01-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36028  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 18:20:12  

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

[ show close-approach data ]
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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