The Great Comet of 1861 formally designated C/1861 J1
and 1861 II
, is a long-period comet
that was visible to the naked eye
for approximately 3 months. It was categorized as a Great Comet
, one of eight in the 19th century.
It was discovered by John Tebbutt
of Windsor, New South Wales
, on May 13, 1861, with an apparent magnitude
of +4, a month before perihelion
(June 11). It was not visible in the northern hemisphere until June 29, but it arrived before word of the comet's discovery.
The comet of 1861 interacted with the Earth in an almost unprecedented way. For two days, when the comet was at its closest (0.1326 AU
), the Earth was actually within the comet's tail, and streams of cometary material converging towards the distant nucleus
could be seen. By day also the comet's gas and dust even obscured the Sun.
By the middle of August the comet was no longer visible to the naked eye, but it was visible in telescopes until May 1862. An elliptical orbit with a period of about 400 years was calculated, which would indicate a previous appearance about the middle of the 15th century, and a return in the 23rd century.
As of 1992 this Great Comet had traveled more than 100 AU from the Sun, making it even further away than dwarf planet Eris
. It will come to aphelion around 2063.I. Hasegawa
and S. Nakano
suggest that this comet is identical with C/1500 H1
- on Cometography.com
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