Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1243784578196735 3.2772e-08  
a 3.192198141838958 1.6477e-08 au
q 2.795157459902201 1.0603e-07 au
i 6.649282370155714 4.4488e-06 deg
node 29.5805028879916 3.3351e-05 deg
peri 56.82379062280122 3.7994e-05 deg
M 290.9540394057219 1.9248e-05 deg
tp 2459000.048001636204
(2020-May-30.54800164)
0.00011245 TDB
period 2083.210652021158
5.70
1.613e-05
4.416e-08
d
yr
n .1728101762780079 1.338e-09 deg/d
Q 3.589238823775716 1.8527e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3433  
   data-arc span      20684 days (56.63 yr)  
   first obs. used      1962-12-31  
   last obs. used      2019-08-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36752  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-23 19:21:25  

Additional Information
 Earth MOID = 1.81824 au 
 Jupiter MOID = 1.6785 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 10.7   n/a MPO421648  
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-January); 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2019-Oct-21 21:35 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin