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Deep Impact. By: Ashley King. Visual obstruction of the edge of the comet by the ejecta. T= 0.001(s). T= 1.747(s). T= 5.482(s). T= 3.615(s). Comparing light intensity before and after impact. Line A, t= 1.747(s). Intensity after Impact . Ejecta Fit is subtracted out. W/[m^2 sr um].

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Deep impact

Deep Impact

By: Ashley King


Visual obstruction of the edge of the comet by the ejecta
Visual obstruction of the edge of the comet by the ejecta

T= 0.001(s)

T= 1.747(s)

T= 5.482(s)

T= 3.615(s)


Comparing light intensity before and after impact
Comparing light intensity before and after impact

Line A, t= 1.747(s)

Intensity after Impact

Ejecta Fit is subtracted out

W/[m^2 sr um]

Fit 2

Fit 1

Intensity of edge before impact (I0)

I/I0 = e^(- τ )

τ = Optical Depth

Final Intensity (I)

Pixel


Graph of the results line a
Graph of the results: Line A

Fit 2

Fit 1

ext 

I/I0


Graph of the results line d
Graph of the results: Line D

Fit 2

Fit 1

I/I0


Conclusions
Conclusions

The data will be used to determine properties of the cometary nucleus:

  • Determine stratification in the nucleus

  • Resolve where the ice lies

    • Use reflectivity derived from brightness and optical depth

      Current research indicates :

  • Layered nucleus evidenced by appearance of rayed ejecta (Schultz et al., 2005) (A’Hearn et al., 2005)

  • the water ice lies within the first few centimeters to meters below the surface (Groussin et al., 2007)


Works cited
Works Cited

A’Hearn, M. F., M. J. S. Belton, W. A. Delamere, J. Kissel, K. P. Klaasen, L. A. McFadden, et al.: 2005, Science310, 258.

Groussin, O., M. F. A’Hearn, J.-Y. Li, P. C. Thomas, J. M. Sunshine, C. M. Lisse, et al.: 2007, Icarus187, 16.

Schultz, P. H., C. M. Ernst, J. B. Anderson: 2005, Space Sci. Rev. 117, 207.