C/1864 O1 (Donati–Toussaint)
< C
| Discovery | |
|---|---|
| Discovered by | Giovanni B. Donati Carlo Toussaint |
| Discovery site | Florence, Italy |
| Discovery date | 23 July 1864 |
| Designations | |
| 1864 III | |
| Orbital characteristics | |
| Epoch | 16 October 1864 (JD 2402160.5) |
| Observation arc | 213 days |
| Number of observations | 57 |
| Aphelion | 2,900 AU |
| Perihelion | 0.931 AU |
| Semi-major axis | 1,450 AU |
| Eccentricity | 0.999358 |
| Orbital period | 55,242 years |
| Inclination | 109.71° |
| 33.666° | |
| Argument of periapsis | 232.46° |
| Last perihelion | 11 October 1864 |
| TJupiter | –0.400 |
| Physical characteristics | |
| Comet total magnitude (M1) | 5.2 |
| 9.0 (1864 apparition) | |
Comet Donati–Toussaint, formally designated as C/1864 O1, is a non-periodic comet co-discovered by Italian astronomers, Giovanni Battista Donati and Carlo Toussaint in July 1864.