Table 2
Parameters of central flashes caused by the atmospheres of Triton and Pluto; also see Table F.1.
| Triton1 | Pluto2 | |
|---|---|---|
| φ⊥(0) | 1.1 × 10−2 | 2.6 × 10−3 |
| Mean limb radius | 1353 km | 1190 km |
| Flash layer radius RCF | 1361 km | 1191 km |
| Diffraction, point-like star, and monochromatic wave | ||
| Thickness of flash layer | 130m | 60 m |
| Peak value3 | 3 × 105 | 5 × 104 |
| Diameter first dark fringe | 1.6m | 1.8 m |
| Poisson fringe spacing λP | 1.1 m | 1.2m |
| Finite stellar diameter, geometrical optics | ||
| Peak value4 | 240 | 50 |
| Flash FWHM | 570 m | 570 m |
Notes. The quantities listed here are calculated by assuming a projected stellar diameter D* = 0.5 km and a Fresnel scale λF = 1.2 km, typical of Pluto and Triton occultations. (1)McKinnon et al. (1995) and Marques Oliveira et al. (2022). (2)Hinson et al. (2017), Dias-Oliveira et al. (2015) and Sicardy et al. (2021). (3)From Eq. (46). (4)From Eq. (62).
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