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2451 Dollfus (1980 RQ)
Classification: Main-belt Asteroid          SPK-ID: 2002451
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1521374776543677 4.5793e-08  
a 2.724447506607409 1.736e-08 au
q 2.309956934950426 1.276e-07 au
i 8.590574046638308 6.0875e-06 deg
node 331.8057108594671 3.5955e-05 deg
peri 325.4539261876259 4.2245e-05 deg
M 23.69638912299743 2.4947e-05 deg
tp 2457492.382557054144
0.00011348 JED
period 1642.540526258238
n .2191726744301962 2.0949e-09 deg/d
Q 3.138938078264391 2.0002e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1332  
   data-arc span      27584 days (75.52 yr)  
   first obs. used      1940-10-07  
   last obs. used      2016-04-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51131  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 12:39:30  

Additional Information
 Earth MOID = 1.29999 au 
 Jupiter MOID = 2.11223 au 
 T_jup = 3.324 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.7 mag n/a MPO279540  
rotation period rot_per 48. h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Behrend, R. (2007) Observatoire de Geneve web site,]
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

2451 Dollfus           Discovered 1980 Sept. 2 by E. Bowell at the Anderson Mesa station of the Lowell Observatory.
Named in honor of Audouin Dollfus, astronomer at the Observatoire de Paris, Meudon. Dollfus is renowned for his fundamental work on planetary polarimetry and ground-based imaging, including studies of Saturn's rings, the Martian and lunar surfaces, and the Venus atmosphere. Recently he has worked on the polarimetric properties of minor planets.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 6531Last Updated: 2006-03-21

Alternate Designations
 1980 RQ = 1935 QS = 1940 TC = 1953 PO = 1953 SC = 1965 CH = 1974 CL1 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
FirstGov 2016-May-06 14:53 UT
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