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4843 Megantic (1990 DR4)
Classification: Main-belt Asteroid          SPK-ID: 2004843
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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1214834231282838 4.7864e-08  
a 3.087926397496976 2.2268e-08 au
q 2.712794528360854 1.4909e-07 au
i 11.00993958074295 5.0842e-06 deg
node 162.633416032394 2.5839e-05 deg
peri 220.7275977652214 3.3705e-05 deg
M 68.04935649431748 2.0029e-05 deg
tp 2457225.854639346975
0.00011099 JED
period 1981.97803452192
n .1816367253973311 1.9647e-09 deg/d
Q 3.463058266633098 2.4973e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1524  
   data-arc span      39517 days (108.19 yr)  
   first obs. used      1908-01-23  
   last obs. used      2016-04-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53724  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 12:49:45  

Additional Information
 Earth MOID = 1.72419 au 
 Jupiter MOID = 2.02488 au 
 T_jup = 3.186 
[ 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 11.8 mag n/a MPO265983  
diameter diameter 26.02 km 1.5 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4
geometric albedo albedo 0.1039   0.013 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4

4843 Mégantic           Discovered 1990 Feb. 28 by H. Debehogne at the European Southern Observatory.
Named for Mont Mégantic, the largest observatory in Québec. Founded in 1978, its mission is to promote research in astrophysics, to train students and to promote astronomy in the local culture. The observatory is jointly operated by the Université de Montréal and the Université Laval. Name proposed by the discoverer, following a suggestion by P. Bastien and Y. Dutil.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19980808/MPCPages.arcLast Updated: 2009-11-17

Alternate Designations
 1990 DR4 = 1982 RT1 = 1990 EO10 = A908 BH 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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