The Great Comet of 1811, as sketched by William Henry Smyth
Discovery
Discovered by
Honoré Flaugergues
Discovery date
March 25, 1811
Designations
Alternative designations
1811 I, Great Comet of 1811
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[1]
Semi-major axis
212.4 AU
Eccentricity
0.995125
Orbital period
2742 years (inbound) 2974 years (outbound)[2]
Inclination
106.9°
Last perihelion
September 12, 1811
Next perihelion
≈48th century
Physical characteristics
Dimensions
30−40 km[3]
The Great Comet of 1811,[4] 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,[5][6] with an easily visible coma.
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^Jean-Michel Faidit, "La comète impériale de 1811", Les Presses du Midi, 2012; Friedrich Wilhelm Argelander, Ueber die Bahn des grossen cometen von 1811, (Tr. Table of the path of the great comet of 1811) 4, Konigsberg, 1822.
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