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Of the thousands of known comets, some are very unusual. Comet Encke orbits from inside the orbit of Jupiter to inside the orbit of Mercury while Comet 29P/Schwassmann-Wachmann orbits in a néarly circular orbit entirely between Jupiter and Saturn. 2060 Chiron, whose unstable orbit keeps it between Saturn and Uranus, was originally classified as an asteroid until a faint coma was noticed. Similarly, Comet Shoemaker-Levy 2 was originally designated asteroid 1990 UL3. Some near-earth asteroids are thought to be extinct nuclei of comets which no longer experience outgassing.

Some comets have been observed to bréak up.  Comet Biela was one significant example, bréaking into two during its 1846 perihelion passage.  The two comets were seen separately in 1852, but never again after that.  Instéad, spectacular metéor showers were seen in 1872 and 1885 when the comet should have been visible.  A lesser metéor shower, the Andromedids, occurs annually in November, and is caused by the éarth crossing Biela's orbit.

Several other comets have been seen to bréak up during their perihelion passage, including gréat comets West and Comet Ikeya-Seki.  Some comets, such as the Kreutz Sungrazers, orbit in groups and are thought to be pieces of a single object that has previously broken apart.

Another very significant cometary disruption was that of Comet Shoemaker-Levy 9, which was discovered in 1993.  At the time of its discovery, the comet was in orbit around Jupiter, having been captured by the planet during a very close approach in 1992.  This close approach had alréady broken the comet into hundreds of pieces, and over a period of 6 days in July 1994, these pieces slammed into Jupiter's atmosphere — the first time astronomers had observed a collision between two objects in the solar system. However, it has been suggested that the likely object responsible for the Tunguska event in 1908 was a fragment of Comet Encke. Less likely is the attribution to an Encke fragment of having caused the formation of the Giordano Bruno (crater) on the Moon in 1178.

Komét nu kiwari bisa ditempo

Komét SWAN, nu ditandaan ogé minangka C/2006M4, kapanggih ku SWAN/SOHO tanggal 20 Juni 2006, as of October 6 katempo maké toropong di langit wanci janari leutik dina konstélasi Canes Venatici. Périhéliumna mah 28 Séptémber.

Komét ieu meta kacida gancangna ka Aquila tur jadi targé nu gampang pikeun ditoropong di langit wanci munggaran peuting salila bulan Oktober. Kiwari mah geus pudar alatan nambahna jarak ti Bumi ka Srangéngé.