C/1917 F1 (Mellish)
< C
The comet on 20 April 1917, as seen from Australia | |
| Discovery | |
|---|---|
| Discovered by | John E. Mellish |
| Discovery date | 19 March 1917 |
| Designations | |
| 1917 I, 1917a | |
| Orbital characteristics | |
| Epoch | 31 March 1917 (JD 2421318.5) |
| Observation arc | 38 days |
| Earliest precovery date | December 193 |
| Number of observations | 11 |
| Orbit type | Halley-type |
| Aphelion | 54.61 AU |
| Perihelion | 0.190 AU |
| Semi-major axis | 27.398 AU |
| Eccentricity | 0.9931 |
| Orbital period | 143.416 years |
| Inclination | 32.687° |
| 88.675° | |
| Argument of periapsis | 121.314° |
| Last perihelion | 11 April 1917 |
| Next perihelion | ~2060 |
| TJupiter | 0.644 |
| Earth MOID | 0.0618 AU |
| Jupiter MOID | 1.5342 AU |
| Comet total magnitude (M1) | 11.0 |
C/1917 F1 (Mellish), also known as Comet 1917Ι and 1917a, is a Halley-type comet discovered by John E. Mellish on 19 March 1917. The comet has an orbital period of 143 years and last passed perihelion on 11 April 1917. It is the parent body of the December Monocerotids and has also been suggested to be the parent body of daytime kappa Leonids, April ρ-Cygnids, November Orionids, and Canis-Minorids meteor showers.