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16421 Roadrunner (1988 BJ)
Classification: Inner Main-belt Asteroid          SPK-ID: 2016421
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

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 two-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 is not working, here are some notes that might help.
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06354062965954646 5.4851e-08  
a 1.930827669797941 6.8418e-09 au
q 1.808141663894905 1.0768e-07 au
i 22.82689358103623 5.2093e-06 deg
node 309.7749847534974 1.181e-05 deg
peri 234.0798564343161 4.0559e-05 deg
M 325.6582737254478 4.1838e-05 deg
tp 2459093.983145970157
0.00011404 TDB
period 979.9720689694778
n .3673574088479583 1.9526e-09 deg/d
Q 2.053513675700977 7.2765e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1298  
   data-arc span      11775 days (32.24 yr)  
   first obs. used      1988-01-22  
   last obs. used      2020-04-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41229  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:23:11  

Additional Information
 Earth MOID = .856042 au 
 Jupiter MOID = 3.02562 au 
 T_jup = 3.816 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.5   n/a MPO502295  
diameter diameter 3.255 km 0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 174. h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2012) Minor Planet Bull. 39, 158-167.]
[Warner, B.D. (2014) Minor Planet Bull. 41, 27-32.]
geometric albedo albedo 0.263   0.045 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

16421 Roadrunner           Discovered 1988 Jan. 22 by E. W. Elst at Haute Provence.
Roadruner is the common name for the Californian Earthcuckoo (Geococcyx californianus). The name comes from the habit of the bird of racing down roads in front of fast-moving vehicles.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20121228/MPCPages.arcLast Updated: 2013-01-02
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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