Open Access
Table 2
Quantities Σ, mr, 
, τdp, τdp, and τpr estimated for C1R and C2R.
| Symbol | C1R | C2R | Comments | |
|---|---|---|---|---|
| Surface density (kg m−2) | Σ | 118 | 109 | see Eq. (9) |
| Ring mass (kg) | mr | 2 × 1012 | 3 × 1010 | see Eq. (10) |
| Mean radius of particles (cm) |  |
22 | 140 | see Eq. (11) |
| Differential precession timescale (yr) | τdp | 0.001 | 0.06 | see Eq. (12) |
| Inter-particle collisions timescale (yr) | τic | 4000 | 7.3 | see Eq. (13) |
| Poynting-Robertson timescale (yr) | τpr | 109 | 108 | see Eq. (14) |
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