Table 3.
Statistics of (O − C) residuals for our new observational data using the ephemerides DE438/NEP081xl.
| Satellite | Site | Years | Nα | Δα cos δ |
Nδ | Δδ |
Ng | ||
|---|---|---|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | ||||||
| Triton | O44 | 2013 | 22 |
 |
 |
22 |
 |
 |
3 |
| O44 | 2017 | 62 |
 |
 |
62 |
 |
 |
7 | |
| O49 | 2018–2019 | 356 |
 |
 |
356 |
 |
 |
31 | |
| Nereid | O44 | 2017 | 108 |
 |
 |
108 |
 |
 |
8 |
| O49 | 2018–2019 | 287 |
 |
 |
287 |
 |
 |
39 | |
Notes. The statistics are given for each satellite at each observatory and each opposition. Nα, Nδ, and Ng are the numbers of observed Right Ascension (α), Declination (δ), and observation nights, respectively. SD is standard deviation.
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