Table 1
Triton observation residual statistics.
| Site | Date | Source | Type | N1 | RMS1 | N2 | RMS2 |
|---|---|---|---|---|---|---|---|
| 503 | 1847–1848 | Lassell (1849a) | ( p, s) | 4 | 3.003 | 4 | 1.604 |
| 802 | 1847–1868 | Hall (1900); Winlock & Pickering (1888) | (p, s) | 26 | 1.841 | 30 | 0.636 |
| 992 | 1847–1863 | Lassell(1849a,b, 1850, 1851, 1852a,b, 1857, 1864); Rümker (1849) | (p, s) | 60 | 1.685 | 31 | 0.539 |
| 787 | 1873–1877 | Davis (1874); Hall (1876, 1877); Holden (1881) | (p, s) | 69 | 0.649 | 79 | 0.241 |
| 007 | 1883–1884 | Henry (1886, 1884a,b) | (p, s) | 16 | 1.598 | 20 | 0.402 |
| H80 | 1883–1888 | Young (1888) | (p, s) | 28 | 1.356 | 19 | 0.195 |
| 968 | 1885–1886 | Lohse (1887) | (p, s) | 3 | 1.674 | 3 | 0.988 |
| 020 | 1886–1887 | Perrotin (1887) | (p, s) | 7 | 0.874 | 9 | 0.166 |
| 780 | 1889–1891 | Parrish & Stone (1892) | (p, s) | 7 | 0.731 | 5 | 0.442 |
| 662 | 1892–1928 | Barnard (1893, 1894, 1895); Schaeberle (1895, 1897); Hussey (1902, 1899); Aitken (1899, 1904); Perrine (1903); Albrecht (1909); Crawford (1928) | (p, s) | 275 | 0.628 | 283 | 0.187 |
| 786 | 1894–1923 | USNO (1911); Hammond & Rice (1905); Hammond (1906); Hall (1911); Hall & Burton (1913); Hall (1920, 1922); Burton (1913); Burton & Hall (1919); Bower & Hall (1923) | (p, s) | 350 | 0.716 | 476 | 0.312 |
| 000 | 1896–1910 | Christie (1901, 1904, 1909); ROG (1899, 1900, 1903, 1904, 1905, 1906, 1907, 1908, 1913) | (p, s) | 377 | 0.717 | 348 | 0.163 |
| 690 | 1896–1898 | Drew (1897, 1899) | (p, s) | 51 | 0.922 | 39 | 0.261 |
| 754 | 1897–1922 | Barnard (1898, 1899, 1901, 1903, 1906a,b, 1907, 1909, 1910, 1912, 1913, 1915, 1916, 1917, 1919, 1927) | (p, s) | 683 | 0.757 | 1100 | 0.225 |
| 084 | 1899–1923 | Kostinsky (1900, 1902); Balanovskii (1923); Nikolaevich & Dorimedontovich (1926) | (p, s) | 136 | 0.956 | 125 | 0.244 |
| 522 | 1903–1905 | Wirtz (1905) | (p, s) | 6 | 1.224 | 8 | 0.342 |
| 077 | 1939–1942 | Alden (1940, 1943) | (p, s) | 57 | 0.213 | 50 | 0.038 |
| 689 | 1975–1986 | Walker et al. (1978); Harrington & Walker (1984); Walker & Harrington (1988) | (X, Y) | 173 | 0.020 | 173 | 0.054 |
| 874 | 1985–1997 | Veiga & Martins (1996); Veiga et al. (1996); Veiga & Martins (1998) | (X, Y) | 1124 | 0.111 | 1124 | 0.151 |
| 119 | 1986–1993 | Kiseleva et al. (2012) | (α,δ) | 35 | 0.324 | 35 | 0.484 |
| 188 | 1987–1990 | Kulyk (priv. comm.); Yizhakevych (2016) | (α,δ) | 6 | 0.316 | 6 | 0.258 |
| Voyager 2 | 1988–1989 | Jacobson (1991) | (α,δ) | 359 | 0.187 | 359 | 0.147 |
| 874 | 2000–2002 | Martins et al. (2004) | (α,δ) | 54 | 0.102 | 54 | 0.053 |
| 327 | 2006–2007 | Qiao et al. (2014); Yu & K (2019) | (α,δ) | 118 | 0.074 | 118 | 0.084 |
| 689 | 1998–2014 | USNO (2013, 2014) | (α,δ) | 928 | 0.099 | 928 | 0.110 |
| 673 | 1999–2012 | Owen (1999); TMO (2014) | (α,δ) | 175 | 0.045 | 175 | 0.045 |
| 999 | 1999–2013 | Dourneau et al. (2007, 2015) | (α,δ) | 260 | 0.079 | 260 | 0.148 |
| 250 | 2004–2015 | Showalter et al. (2019) | (X, Y) | 40 | 0.008 | 40 | 0.005 |
| 337 | 2005–2014 | Zhang et al. (2021, Zhang et al. 2022) | (α,δ) | 2536 | 0.048 | 2536 | 0.041 |
| O44 | 2013–2019 | Yuan et al. (2021b) | (α,δ) | 59 | 0.044 | 59 | 0.027 |
| O49 | 2013–2020 | Yuan et al. (2021b) | (α,δ) | 1006 | 0.022 | 1006 | 0.025 |
| 286 | 2013–2019 | Wang et al. (2017); Yan et al. (2022) | (α,δ) | 1560 | 0.033 | 1560 | 0.020 |
Notes. The data under “Site” are the IAU observatory code. Data in columns N1 and N2 show the number of each type of observed coordinate we used in our fitting process. The RMS1 and RMS2 columns show the root mean square of the post-fit residuals from our orbit-fitting process after outlier rejection through the Isolation Forest algorithm. We assigned the weights to each data group in accordance with the RMS1 and RMS2 of the post-fit residuals. For the coordinate position angle p, the unit is in degrees. And for other types, the unit is in arcseconds.
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