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7939 Asphaug (1991 AP1)
Classification: Main-belt Asteroid          SPK-ID: 2007939
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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .213159331310751 4.1416e-08  
a 2.36216003848586 9.3727e-09 au
q 1.858643584233236 1.0093e-07 au
i 1.501287323393355 5.0599e-06 deg
node 331.9120512619756 0.00016871 deg
peri 85.39131529887857 0.00016922 deg
M 46.46380190909259 1.2737e-05 deg
tp 2457429.350889472127
4.6623e-05 JED
period 1326.057646134573
n .2714814103665791 1.6158e-09 deg/d
Q 2.865676492738484 1.1371e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1061  
   data-arc span      17295 days (47.35 yr)  
   first obs. used      1968-10-22  
   last obs. used      2016-02-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .56338  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Mar-24 15:58:13  

Additional Information
 Earth MOID = .869809 au 
 Jupiter MOID = 2.49051 au 
 T_jup = 3.519 
[ 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 14.6 mag n/a MPO365344  

7939 Asphaug           Discovered 1991 Jan. 14 by E. F. Helin at Palomar.
Named in honor of Erik Asphaug (b. 1961), currently in the Earth Sciences Department at the University of California at Santa Cruz. Asphaug has pioneered the application of fracture mechanics and hydrodynamics to numerous problems in planetary science. Using a radar-derived model of (4769) Castalia, he has explored how effects of a hypervelocity impact depend on the projectile's energy, the equation of state of the target material and the target's internal configuration of fractures and voids. His calculations have important implications for our understanding of the collisional evolution of minor planets and for the mitigation of hazards due to comets and 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: 19981005/MPCPages.arcLast Updated: 2009-11-17

[ show close-approach data ]
Alternate Designations
 1991 AP1 = 1968 UW = 1986 SK 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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