Analyzing Light Intensity Changes Post-Comet Impact for Nucleus Property Determination
This study investigates the visual obstruction at the edge of a comet caused by ejecta over multiple time intervals (T = 0.001s, 1.747s, 3.615s, and 5.482s). By comparing light intensity before and after the impact, we aim to derive optical properties of the cometary nucleus, including its stratification and the location of water ice. Our findings support the theory of a layered nucleus and highlight water ice presence close to the surface. This research builds on previous studies and contributes to our understanding of cometary structure and composition.
Analyzing Light Intensity Changes Post-Comet Impact for Nucleus Property Determination
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Presentation Transcript
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
Graph of the results: Line D Fit 2 Fit 1 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.
