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Table 4
Final values for the properties of 55 Cnc e.
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| Planet-to-star radii ratio | Rp∕R⋆ | 0.0182 ± 2×10−4 | |
| Radius | Rp | 1.875 ± 0.029 | REarth |
| Mass† | Mp | 7.99 |
MEarth |
| Density | ρp | 6.66 |
g cm−3 |
| Transit epoch |  –2 450 000 |
7063.2096 |
BJDTDB |
| Orbital period† | P | 0.7365474 |
days |
| Orbital inclination | ip | 83.59 |
deg |
| Impact parameter | b | 0.39 ± 0.03 | |
| Eccentricity† | e | 0.05 ± 0.03 | |
| Argument of periastron† | ω | 86.0 |
deg |
| Scaled semi-major axis† | ap∕R⋆ | 3.52 ± 0.01 | |
| Semi-major axis† | ap | 0.01544 ± 0.00005 | au |
Notes: All values are derived from the HST/STIS transit analysis, except for parameters with a dagger derived from the velocimetry analysis, and reported from Table 3. Bulk density is derived from the posterior distributions on the planet mass and radius.
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