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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2134013292263722 4.909e-08  
a 2.362458936448036 1.3114e-08 AU
q 1.858307059167303 1.1517e-07 AU
i 1.501428963236839 5.8005e-06 deg
node 331.9155408850978 0.00020797 deg
peri 85.36941514143925 0.00020826 deg
M 243.620966254832 1.619e-05 deg
tp 2457429.262777787197
(2016-Feb-10.76277779)
6.1751e-05 JED
period 1326.309344872008
3.63
1.1044e-05
3.024e-08
d
yr
n .2714298903132142 2.2601e-09 deg/d
Q 2.866610813728768 1.5913e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      848  
   data-arc span      16680 days (45.67 yr)  
   first obs. used      1968-10-22  
   last obs. used      2014-06-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .57486  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jul-14 12:18:22  

Additional Information
 Earth MOID = .870692 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 14.5 mag n/a MPO299020  

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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