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4942 Munroe (1987 DU6)
Classification: Main-belt Asteroid          SPK-ID: 2004942
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1365686422526735 5.2346e-08  
a 2.201270616854447 8.8059e-09 AU
q 1.90064607747993 1.1556e-07 AU
i 3.834590961953976 4.6999e-06 deg
node 278.1646331186026 8.73e-05 deg
peri 11.18763266550251 9.0189e-05 deg
M 67.4869645688602 2.2819e-05 deg
tp 2456776.872105014172
7.5586e-05 JED
period 1192.912478864771
n .3017824076604447 1.8109e-09 deg/d
Q 2.501895156228964 1.0008e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1412  
   data-arc span      21761 days (59.58 yr)  
   first obs. used      1955-06-23  
   last obs. used      2015-01-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5118  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 13:56:13  

Additional Information
 Earth MOID = .88577 AU 
 T_jup = 3.650 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.4 mag n/a MPO319146  
SMASSII spectral type spec_B X   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)

4942 Munroe           Discovered 1987 Feb. 24 by H. Debehogne at the European Southern Observatory.
Randall Munroe (b. 1984) is a former NASA roboticist and the author of xkcd, a popular webcomic various themes including science, mathematics technology and computer science.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2013-07-22Last Updated: 2014-08-13

[ show close-approach data ]
Alternate Designations
 1987 DU6 = 1955 MS = 1971 GE = 1990 CB 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2015-Mar-28 09:22 UT
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