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In comet nomenclature, the letter before the "/" is either "C" (a non-periodic comet), "P" (a periodic comet), "D" (a comet that has been lost or has disintegrated), "X" (a comet for which no reliable orbit could be calculated —usually historical comets), "I" for an interstellar object, or "A" for an object that was either mistakenly ...
In 1995, comet 73P/Schwassmann–Wachmann, broke up into several pieces and as of its last perihelion date, the pieces numbered at least 67 with 73P/Schwassmann–Wachmann C as the presumed original nucleus. Because of the enormous number, the pieces of it have been compiled into a separate list.
Coin showing Caesar's Comet as a star with eight rays, tail upward. Non-periodic comets are seen only once. They are usually on near-parabolic orbits that will not return to the vicinity of the Sun for thousands of years, if ever.
C/2024 S1 (ATLAS) (previously had the temporary designation A11bP7I) was a sungrazing comet that was discovered from the ATLAS–HKO in Hawaii on 27 September 2024. The comet passed its perihelion on 28 October 2024, at a distance of about 0.008 AU (1.2 million km; 0.74 million mi) from the barycenter of the Solar System, [1] and disintegrated.
The comet entered SOHO's LASCO C3 camera's field of view on 12 January, [9] and was viewable on the web in near real-time. The comet left SOHO's field of view on 16 January. [9] Due to its proximity to the Sun, the Northern Hemisphere ground-based viewers had a short window for viewing, and the comet could be spotted only during bright twilight.
Comet Siding Spring had an apparent magnitude of 18.4 to 18.6. At the time of its discovery, it was 7.2 AU (1.08 × 10 9 km; 670,000,000 mi) from the Sun. Precovery images by the Catalina Sky Survey from 8 December 2012 were found quickly and announced with the discovery giving Comet Siding Spring a 29-day observation arc. [1]
At perihelion Comet Machholz passes the Sun at 122 kilometers per second (440,000 kilometers per hour). [3] It comes closer to the Sun than any numbered comet less than 321P/SOHO. [7] Between 1897 and 2102 perihelion gradually drops from 0.17 AU (25 million km) to 0.09 AU (13 million km). [14] 2081 will be the first perihelion below 0.1 AU. [14]
62P/Tsuchinshan, also known as Tsuchinshan 1, is a periodic comet first discovered January 1, 1965 at the Purple Mountain Observatory in Nanking. [6] It last came to perihelion on 25 December 2023 at around apparent magnitude 8, [2] and was then 0.53 AU (79 million km) from Earth and 110 degrees from the Sun. [4]