Английская Википедия:C/2018 Y1 (Iwamoto)
Шаблон:Use dmy dates Шаблон:Infobox comet
C/2018 Y1 (Iwamoto) is a long period comet with a retrograde orbit discovered on December 18, 2018, by Japanese amateur astronomer Masayuki Iwamoto.[1] Its period is estimated to be 1,733 years. It passed closest to Earth on February 13, 2019.[2] It was expected to reach a magnitude of between 6.5 and 7.5, visible in binoculars or a small telescope[2][3] and was reported to reach a magnitude of 5.5 by Juan Jose Gonzalez on February 13, before fading to 7.6 two weeks later.[4]
The comet was observed by iSHELL spectrograph at the NASA Infrared Telescope Facility (IRTF). Overall, the measured spatial distributions for polar molecules (in particular, H2O and CH3OH) were broader, exhibiting more complex structure compared with nonpolar or weakly polar species ([[methane|Шаблон:Chem2]], [[ethane|Шаблон:Chem2]], and CO). Compositionally, compared to their respective mean abundances among comets from the Oort cloud, Шаблон:Chem2 and Шаблон:Chem2 were enriched, Шаблон:Chem2 and HCN were near normal, and all other species were depleted. The abundance ratio Шаблон:Chem2/Шаблон:Chem2 was higher by 45% ± 8% on January 13 versus February 5, whereas Шаблон:Chem2Шаблон:Chem2 was unchanged within the uncertainty, suggesting nonhomogeneous composition among regions of the nucleus dominating activity on these dates.[5]
Gallery
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Animation of C/2018 Y1 orbit
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Animation of C/2018 Y1 orbit 1600-2500
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Comet C/2018 Y1 (Iwamoto) with M44, 13. February 2019, 23:04 Uhr
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Comet C/2018 Y1 (Iwamoto) with the spiral galaxy NGC 2903, 13 February 2019, 23:19 Uhr
References
Шаблон:Comets Шаблон:2019 in space Шаблон:Authority control
- ↑ Шаблон:Cite web
- ↑ 2,0 2,1 Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite journal Файл:CC-BY icon.svg This article contains quotations from this source, which is available under the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license.
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