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C/2019 Y4 (ATLAS) was a comet with a near-parabolic orbit discovered by the ATLAS survey on December 28, 2019. [4] Early predictions based on the brightening rate suggested that the comet could become as bright as magnitude 0 matching the brightness of Vega. [5]
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 ...
Comet Crommelin, also known as Comet Pons-Coggia-Winnecke-Forbes, is a periodic comet with an orbital period of almost 28 years. It fits the classical definition of a Halley-type comet with (20 years < period < 200 years). It is named after the British astronomer Andrew C. D. Crommelin who calculated its orbit in 1930.
The following list is of comets with very long orbital periods, defined as between 200 and 1000 years.These comets come from the Kuiper belt and scattered disk, beyond the orbit of Pluto, with possible origins in the Oort cloud for many.
Even at its minimum estimated diameter, C/2014 UN 271 is the largest Oort cloud comet discovered, being more than 50 times larger than a typical comet which is less than 2 km (1.2 mi) in diameter. The previous largest known long-period comet was C/2002 VQ 94 (LINEAR) with a diameter of 96 km (60 mi), [ 35 ] followed by Comet Hale–Bopp at 74 ...
Comet Howard–Koomen–Michels, also formally known as C/1979 Q1 (Solwind), [1] was a large sungrazing comet that collided with the Sun on August 30, 1979. [4] It is the first comet discovered by an orbiting satellite and the only comet known to have made contact with the Sun's surface, as most bodies vaporize before impact.
The nucleus of the comet was found to rotate every 8.5 [8] to 8.7 hours. [9] In the spectrum of the comet in the wavelength range between 5000 and 7000 Å many emission lines of NH 2, C 2, and [OI] are detected. [36] [37] The spectrum of the comet was obtained on 10 March 2023 and lines associated with CN, diatomic and triatomic carbon and ...
The comet has a retrograde orbit, lying at an inclination of 139°. Τhe comet had its perihelion on 27 September 2024, at a distance of 0.391 AU. Τhe closest approach to Earth was on 12 October 2024, at a distance of 0.47 AU. The comet does not approach close to the giant planets of the Solar System. [10]