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Table 1
Parameters used in the EDCM for the CI mission target.
| Symbol | Unit | Parameter | Value/range/function | Step size |
|---|---|---|---|---|
| Nucleus parameters | ||||
| rh | au | Heliocentric distance | 1 | n/a |
| RN | km | Nucleus radius | 2, 5 | n/a |
| ρN | kg m−3 | Bulk density of the nucleus | 317, 508 | n/a |
| Tn | K | Nucleus surface temperature at the sub-solar point | 317 | n/a |
| q(φ) | – | Gas emission distribution (~cosk(φ)) | k = 1, 2, 3 | n/a |
 |
s−1 | Global gas production rate for an equivalent sphere with  |
1.3 × 1027−4.9 × 1028 | Uniformly sampled |
 |
– | Relative night side activity | 0.01, 0.05, 0.1 | n/a |
| Dust particle parameters | ||||
| a | m | Radius | 10−6–10−1 | Half decade |
| ϱd(a) | kg m−3 | Bulk density | 300–1000 | 100 |
| qrad(a) | – | Radiation pressure efficiency | 0.2–2 | ~0.1 |
| qsca(a) | – | Scattering efficiency | Silicates & Organics(*) | n/a |
| ϕ(α) | – | Phase function | Silicates & Organics(*) | n/a |
| Dust coma parameters | ||||
| Afρ | cm | Brightness | 2800–28 000 | 2000 |
| β | – | Differential power law exponent of the dust size | 3.2–4.4 | 0.2 |
| distribution; n ~ a−β | ||||
| χ(*) | – | Dust-to-gas mass production rate ratio | <10 | n/a |
| S/C trajectory parameters | ||||
| rCA | km | Cometocentric distance of spacecraft at closest aThe closest approach (CA) distance, the trajectory angle in the meridional plane, αT, and the trajectory angle in the equatorial plane, βT. pproach (CA) | 1000, 500, 200 | for S/C A,B1, B2 |
| αT | deg | Trajectory angle in the meridional plane | 0 | n/a |
| βT | deg | Trajectory angle in the equatorial plane | 0 | n/a |
Notes.(*) See Marschall et al. (2020).
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