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Comet ISON, formally known as C/2012 S1, was a sungrazing comet from the Oort cloud which was discovered on 21 September 2012 by Vitaly Nevsky (Віталь Неўскі, Vitebsk, Belarus) and Artyom Novichonok (Артём Новичонок, Kondopoga, Russia).
P/2015 PD 229 (Cameron–ISON) is a periodic comet that was initially thought to be an active centaur upon discovery. It orbits the Sun between Jupiter and Saturn once every 19.2 years, and has appeared to have made several close encounters with the giant planets from 1889 to 1949. [4]
The comet was spotted with the naked eye by Piotr Guzik on 8 September at an estimated magnitude of 4.7. [10] The comet tail was up to 7.5 degrees long when imaged with CCD. [10] On 12 September 2023 the comet passed 0.84 AU (126 million km; 78 million mi; 330 LD) from Earth but was only 15 degrees from the glare of the Sun. [11]
Scientists say comet C/2023 A3 Tsuchinshan-ATLAS is visible once every 80,000 years, and people across North America were treated to stunning views. Striking photos show stunning, once-in-a ...
ISON is managed by the Keldysh Institute of Applied Mathematics, part of the Russian Academy of Sciences. [2] [3] It was credited for the discovery of comets C/2010 X1 (Elenin), [4] P/2015 PD 229, [5] and C/2012 S1 (ISON), [6] the latter popularly known as Comet ISON. The minor planet 365756 ISON is named for the network. [7]
The comet had also low production rate for hydroxyl radical and low dust signal. [5] However, C/2023 H2 displays very high mixing ratio with respect to water of carbon monoxide (16.3 ± 0.6%), as well as high abundances of ethane , methane , hydrogen cyanide , and methanol .
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NASA Update Continuing a history of surprising behavior, material from Comet ISON appeared on the other side of the sun on the evening on Nov. 28, 2013, despite not having been seen in observations during its closest approach to the sun. The question remains whether it is merely debris from the comet, or if some portion of the comet's nucleus ...