C/2018 Y1 (Iwamoto)

For the 2013 and 2020 comets of the same name, see C/2013 E2 (Iwamoto) and C/2020 A2 (Iwamoto).
C/2018 Y1 (Iwamoto)
Comet Iwamoto as seen from the infrared telescope NEOWISE on 25 February 2019
Discovery[1]
Discovered byMasayuki Iwamoto
Discovery date18 December 2018
Orbital characteristics[2]
Epoch3 March 2019 (JD 2458545.5)
Observation arc348 days
Number of
observations		2,771
Aphelion287.25 AU
Perihelion1.287 AU
Semi-major axis144.27 AU
Eccentricity0.9911
Orbital period1,733 years
Inclination160.40°
147.48°
Argument of
periapsis		358.06°
Last perihelion7 February 2019
TJupiter–1.286
Earth MOID0.299 AU (44.7 million km)
Jupiter MOID1.507 AU (225.4 million km)
Comet total
magnitude (M1)		13.6

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.[3] It was expected to reach a magnitude of between 6.5 and 7.5, visible in binoculars or a small telescope[3][4] 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.[5]

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 (CH4, C2H6, and CO). Compositionally, compared to their respective mean abundances among comets from the Oort cloud, C2H6 and CH3OH were enriched, CH4 and HCN were near normal, and all other species were depleted. The abundance ratio CH3OH/C2H6 was higher by 45% ± 8% on January 13 versus February 5, whereas CH4/C2H6 was unchanged within the uncertainty, suggesting nonhomogeneous composition among regions of the nucleus dominating activity on these dates.[6]

  • Animation of C/2018 Y1 orbit    Mercury ·    Venus ·   Earth ·   Mars ·    C/2018 Y1
    Animation of C/2018 Y1 orbit
       Mercury ·    Venus ·   Earth ·   Mars ·    C/2018 Y1
  • Animation of C/2018 Y1 orbit 1600-2500    Sun ·    Uranus ·    C/2018 Y1
    Animation of C/2018 Y1 orbit 1600-2500
       Sun ·    Uranus ·    C/2018 Y1
  • Comet C/2018 Y1 (Iwamoto) with M44, 13. February 2019, 23:04 Uhr
    Comet C/2018 Y1 (Iwamoto) with M44, 13. February 2019, 23:04 Uhr
  • Comet C/2018 Y1 (Iwamoto) with the spiral galaxy NGC 2903, 13 February 2019, 23:19 Uhr
    Comet C/2018 Y1 (Iwamoto) with the spiral galaxy NGC 2903, 13 February 2019, 23:19 Uhr
  • Comet C/2018 Y1 (Iwamoto) with nebulae IC 410 and IC 405
    Comet C/2018 Y1 (Iwamoto) with nebulae IC 410 and IC 405

See also

References

  1. ^ a b James, Nick. "C/2018 Y1 (Iwamoto) - A new comet for the new year". Britastro.org. Retrieved 2 February 2019.
  2. ^ "C/2018 Y1 (Iwamoto) – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 15 October 2022.
  3. ^ a b "Speedy comet approaching Earth's vicinity". Earth & Sky. Retrieved 2 February 2019.
  4. ^ Hanneke Weitering (12 February 2019). "How to See Comet Iwamoto Fly Past Earth This Week". Space.com. Retrieved 15 October 2022.
  5. ^ "Weekly Information about Bright Comets (2019 Mar. 2: North)". www.aerith.net. Retrieved 15 October 2022.
  6. ^ DiSanti, Michael A.; Bonev, Boncho P.; Dello Russo, Neil; McKay, Adam J.; Roth, Nathan X.; Saki, Mohammad; Gibb, Erika L.; Vervack Jr., Ronald J.; Khan, Younas; Kawakita, Hideyo (9 November 2021). "Volatile Composition and Outgassing in C/2018 Y1 (Iwamoto): Extending Limits for High-resolution Infrared Cometary Spectroscopy between 2.8 and 5.0 μm" (PDF). The Planetary Science Journal. 2 (6): 225. Bibcode:2021PSJ.....2..225D. doi:10.3847/psj/ac07ae. ISSN 2632-3338. S2CID 229008642. 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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