Table 1
Circumstances and light-curve fitting results of the 5 September 2019 event.
| Occulted star | |
| Identification (Gaia DR3(a)) | 6771712487062767488 |
| Geocentric astrometric position | αs = 19h29m11s.1996 |
| at observational epoch (ICRF(b)) | δs = −22°21′39″.880 |
| Pluto’s body | |
| Mass(c), GMp (km3 s−2) | 869.6 |
| Radius(c), Rp (km) | 1187 |
| Pluto’s atmosphere | |
| N2 molecular mass(d), µ (kg) | 4.652 × 10−26 |
| N2 molecular | 1.091 × 10−23 |
| refractivity(e), K (cm3) |  |
| Boltzmann constant(f) kB (J K−1) | 1.380649 × 10−23 |
| Given reference radius(g) r0 (km) | 1215 |
| Results of atmospheric fit (with 1σ error bars) | |
| Pressure at r0, p0 (µbar) | 6.248 ± 0.30 |
| Surface pressure(g) at Rp, psurf (µbar) | 11.478 ± 0.55 |
| Geocentric closest approach distance to shadow center(h) ρcag (km) | +3644 ± 25 |
| Geocentric closest approach time to shadow center(i), tcag (UTC(j)) | 15:01:19.1 ± 0.38 s |
Notes. (a) Gaia Collaboration (2023), used to derive (αs, δs). (b) International Celestial Reference Frame. (c) Stern et al. (2015), where G is the gravitational constant. (d) Assumed to be the only constituent in the light-curve model, following, e.g., Sicardy et al. (2021). (e) Washburn et al. (1930), where λµm is the wavelength expressed in microns. For stations use no filters (clear), a nominal central wavelength (λµm = 0.55) was used. (f) Newell & Tiesinga (2019). (g)Using a ratio psurf/p0 = 1.837 given by the template model (Meza et al. 2019; Sicardy et al. 2021). (h) Positive (resp. negative) values mean that the shadow center passes north (resp. south) of the geocenter. (i) Timings by QHY174GPS camera are used as time references, considering their reliability and accuracy. (j) Coordinated Universal Time.
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