Table 6
NG parameters A1, A2, and A3 (in units of 10−8 au·day−2) for chosen NG orbits described in Table 5 for C/2017 M4 (Sect. 4.1), C/1997 BA6 (with a few more observations than in the CODE catalog), and C/2015 O1 (Sect. 4.3), all from the sample LAn.
| Type of | Full arc | PRE | POST | References | Asymm. | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| NG model | A1 | A2 | A3 | A1 | A2 | A3 | A1 | A2 | A3 | PRE/POST | |
| Comet C/2017 M4 | |||||||||||
| NG-std | 946.6 | 57.20 | 217.7 | < 0 | un | here | – | ||||
| ±9.7 | ±11.91 | ±3.80 | |||||||||
| NG-subsolar | 4.979 | 0.3270 | 0.9932 | 7.625 | −9.569 | 0.4456 | 7.606 | −3.118 | 1.169 | here | 1.47 |
| water | ±0.056 | ±0.0698 | ±0.0180 | ±0.499 | ±0.575 | ±0.2054 | ±0.664 | ±0.886 | ±0.505 | ||
| NG-CO | 2.420 | 0.07551 | 0.4242 | 3.709 | −2.404 | −0.1880 | 2.098 | −0.8818 | 0.1722 | here | 1.94 |
| ±0.029 | ±0.03588 | ±0.0083 | ±0.157 | ±0.165 | ±0.0546 | ±0.232 | ±0.2976 | ±0.1408 | |||
| Comet C/1997 BA6 | |||||||||||
| NG-std | 3251 | 88.35 | −25.26 | <0 | un | here | – | ||||
| ±115 | ±50.90 | ±11.68 | |||||||||
| NG-subsolar | 8.872 | 0.2761 | −0.04618 | un | un | here | – | ||||
| water | ±0.294 | ±0.1162 | ±0.0230 | ||||||||
| NG-CO | 3.548 | 0.2619 | −0.01456 | 1.445 | −2.734 | 0.5933 | 3.236 | −1.641 | 0.5741 | here | 0.857 |
| ±0.139 | ±0.0644 | ±0.0089 | ±0.531 | ±0.426 | ±0.146 | ±0.690 | ±0.684 | ±0.216 | |||
| Comet C/2015 O1 | |||||||||||
| NG-std | 13081 | −3506 | 1065 | 81427 | 6476 | 3631 | 13517 | 7145 | 3703 | here | 5.20 |
| ±106 | ±85 | ±36 | ±5645 | ±895 | ±567 | ±2144 | ±233 | ±669 | |||
| NG-subsolar | 9.275 | −3.532 | 0.7162 | 24.69 | −1.949 | −0.0362 | 4.778 | −0.2231 | 2.048 | here | 4.76 |
| water | ±0.069 | ±0.073 | ±0.0208 | ±0.906 | ±0.412 | ±0.1248 | ±0.607 | ±0.7771 | ±0.193 | ||
| NG-CO | 3.200 | −1.417 | 0.2351 | 3.820 | −0.0332 | −0.1175 | 1.098 | 0.2830 | 0.2711 | here | 3.28 |
| ±0.025 | ±0.035 | ±0.0072 | ±0.145 | ±0.1183 | ±0.0327 | ±0.187 | ±0.1754 | ±0.0421 | |||
Notes. For all comets, the smallest RMS is for the NG orbit based on HJ17 and using the entire data arc. For the PRE and POST solutions, NG parameters for NG-CO and HJ17 are shown as in Table 5 (because all remaining NG solutions have poor accuracy marked as “un” in the col- umn for A1 – or negative radial NG parameter (A1). The last column gives the asymmetry in NG parameters between the PRE and POST orbital legs.
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