Deep Impact

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# Deep Impact - PowerPoint PPT Presentation

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

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]

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

Fit 2

Fit 1

ext

I/I0

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

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.