Great Comet of 1811
The Great Comet of 1811, as sketched by William Henry Smyth | |
| Discovery | |
|---|---|
| Discovered by | Honoré Flaugergues |
| Discovery date | March 25, 1811 |
| Designations | |
| 1811 I | |
| Orbital characteristics | |
| Epoch | 1811-Sep-05 2382760.5 |
| Observation arc | 505 days (1.38 years) |
| Number of observations | 1000 |
| Orbit type | Long period comet |
| Aphelion | 423 AU |
| Perihelion | 1.04 AU |
| Semi-major axis | 212.4 AU |
| Eccentricity | 0.995125 |
| Orbital period | 2742 years (inbound) 2974 years (outbound) |
| Inclination | 106.9° |
| Last perihelion | September 12, 1811 |
| Next perihelion | ≈48th century |
| Physical characteristics | |
| Dimensions | 30–40 km (19–25 mi) |
| Comet total magnitude (M1) | 0.0 |
The Great Comet of 1811, formally designated C/1811 F1, is a comet that was visible to the naked eye for around 260 days, the longest recorded period of visibility until the appearance of Comet Hale–Bopp in 1997. In October 1811, at its brightest, and when it was 1.2 AU from Earth, it displayed an apparent magnitude of 0, with an easily visible coma.