1. Non-grav. modeling of 9P/Tempel 1
Davidsson, Gutiérrez, Rickman
Best mass estimate: 5.8x1013 kg (A’Hearn et al.: 7x1013 kg, now about 5x1013 kg)
Outgassing restricted to northern hemisphere (5% in north, 0.1% in south)
Zero thermal inertia, solid material  problem in reproducing 
Thermal inertia <100 (SI units); still problems, unless layer energy absorption in porous material accounted for.

2. ISSI Comet Modeling Project
Univ. of Michigan (Gombosi, Combi, Hansen, Tenishev)
Univ. of Kansas (Cravens)
Univ. of Colorado (Horanyi)
NASA/JPL (Alexander)
TU Braunschweig (Bagdonat, Glassmeier, Motschmann)
Univ. of Bern (Altwegg, Balsiger, Thomas)
Univ. of Uppsala (Rickman, Davidsson)
ISSI (Bonnet, Geiss, von Steiger)
ESA/ESTEC (Schwehm, Ho)
ARIAS (Burgi)
MSSL (Coates)

3. Goal
Improve our understanding of how the cometary nucleus, coma (dust, neutral gas, ions, electrons), and the magnetized solar wind interact as a coupled physical system.
Provide a state-of-the-art numerical model of an “entire comet”.

4. Goal
Comet environment modeling in support of the Rosetta mission (67P/Churyumov-Gerasimenko)
Data analysis, as spacecraft data starts rolling in (e.g., from OSIRIS)

5. Method
Connecting existing state-of-the-art 3D models of various sub-regions of the comet.
Writing model interfaces and passing data between sub-models (iteration if needed)

6. The following figures were happily stolen from
Kenneth Hansen’s (+ISSI team) DPS (2005) poster
“Rosetta-ISSI Comet 67P/Churyumov-Gerasimenko Environment Model”

14. Current status
Working with simple cases (i.e., spherical nucleus, axisymmetric models) to demonstrate connectivity.

15. Near future Implement (or improve) remaining feed-back mechanisms
Consider truly non-symmetric 3D cases