J. Crovisier

Evidence for Surprising Heavy Nitrogen Isotopic Enrichment in Comet 46P/Wirtanen’s Hydrogen Cyanide

Martin Cordiner, K. Darnell, D. Bockelée–Morvan, Nathan X. Roth et autres

Abstract 46P/Wirtanen is a Jupiter-family comet, probably originating from the solar system’s Kuiper Belt, that now resides on a 5.4 yr elliptical orbit. During its 2018 apparition, comet 46P passed unusually close to the Earth (within 0.08 au), presenting an outstanding opportunity …

us, fr (code pays fourni par la source)

Evidence for Surprising Heavy Nitrogen Isotopic Enrichment in Comet 46P/Wirtanen's Hydrogen Cyanide

Martin Cordiner, K. Darnell, D. Bockelée–Morvan, Nathan X. Roth et autres

46P/Wirtanen is a Jupiter-family comet, probably originating from the Solar System's Kuiper belt, that now resides on a 5.4 year elliptical orbit. During its 2018 apparition, comet 46P passed unusually close to the Earth (within 0.08 au), presenting an outstanding opportunity for …

Medieval Comets European and Middle Eastern Perspective, by Piero Sicoli, Roberto Gorelli, Maria José Martinez and Francisco J. Marco. Catalog of Unconfirmed Comets – Volume 1, 1600–1899, by Gary W. Kronk and Maik Meyer Catalog of Unconfirmed Comets – Volume 2, 1900 to the Present, by Gary W. Kronk and Maik Meyer

J. Crovisier

case study in how scientists should, and should not, interact with the public, this book is most valuable.

au (code pays fourni par la source)

Chemical composition of comets C/2021 A1 (Leonard) and C/2022 E3 (ZTF) from radio spectroscopy and the abundance of HCOOH and HNCO in comets

N. Biver, D. Bockelée–Morvan, Barbara Handzlik, Aa. Sandqvist et autres

We present the results of a molecular survey of long period comets C/2021 A1 (Leonard) and C/2022 E3 (ZTF). Comet C/2021 A1 was observed with the Institut de radioastronomie millimétrique (IRAM) 30-m radio telescope in November-December 2021 before perihelion (heliocentric distance 1.22 …

fr, pl, se, ch, us, gb, jp (code pays fourni par la source)

Chemical composition of comets C/2021 A1 (Leonard) and C/2022 E3 (ZTF) from radio spectroscopy and the abundance of HCOOH and HNCO in comets

N. Biver, D. Bockelee-Morvan, Barbara Handzlik, Aa. Sandqvist et autres

We present the results of a molecular survey of long period comets C/2021 A1 (Leonard) and C/2022 E3 (ZTF). Comet C/2021 A1 was observed with the IRAM 30-m radio telescope in November-December 2021 before perihelion when it was closest to the Earth. …

fr, pl, se, ch, us, gb (code pays fourni par la source)

Investigating the composition of Halley-family comet 12P/Pons-Brooks with IRAM radio telescopes

N. Biver, J. Boissier, D. Bockelée–Morvan, J. Crovisier et autres

Comet 12P/Pons-Brooks is a great Halley-family comet with an orbital period of71 years, that was first seen in 1385, and possibly earlier. It returnedto perihelion on 21 April 2024 at 0.78 au from the Sun (Fig.1)Its peak outgassing rate exceeded QH2O=1030 molec.s-1, …

fr, us, ch, gb (code pays fourni par la source)

The Return of the Rosetta Target: Keck Near-infrared Observations of Comet 67P/Churyumov–Gerasimenko in 2021

B. P. Bonev, Neil Dello Russo, Hideyo Kawakita, Ronald J. Vervack et autres

Abstract High-resolution near-infrared ground-based spectroscopic observations of comet 67P/Churyumov–Gerasimenko near its maximum activity in 2021 were conducted from the W. M. Keck Observatory, using the facility spectrograph NIRSPEC. 67P is the best-studied comet to date because of the unprecedented detail and insights …

us, jp, ch, fr, be (code pays fourni par la source)

Molecular Outgassing in Centaur 29P/Schwassmann–Wachmann 1 during Its Exceptional 2021 Outburst: Coordinated Multiwavelength Observations Using nFLASH at APEX and iSHELL at the NASA-IRTF

Nathan X. Roth, Stefanie N. Milam, M. A. DiSanti, Gerónimo Villanueva et autres

Abstract The extraordinary 2021 September–October outburst of Centaur 29P/Schwassmann–Wachmann 1 afforded an opportunity to test the composition of primitive Kuiper disk material at high sensitivity. We conducted nearly simultaneous multiwavelength spectroscopic observations of 29P/Schwassmann–Wachmann 1 using iSHELL at the NASA Infrared Telescope …

us, fr, be, se (code pays fourni par la source)

Gas Sources from the Coma and Nucleus of Comet 46P/Wirtanen Observed Using ALMA

Martin Cordiner, Nathan X. Roth, Stefanie N. Milam, Gerónimo Villanueva et autres

Abstract Gas-phase molecules in cometary atmospheres (comae) originate primarily from (1) outgassing by the nucleus, (2) sublimation of icy grains in the near-nucleus coma, and (3) coma (photo)chemical processes. However, the majority of cometary gases observed at radio wavelengths have yet to …

us, fr (code pays fourni par la source)

Low NH3/H2O ratio in comet C/2020 F3 (NEOWISE) at 0.7 au from the Sun

M. N. Drozdovskaya, D. Bockelée–Morvan, J. Crovisier, Brett A. McGuire et autres

Context. A lower-than-solar elemental nitrogen content has been demonstrated for several comets, including 1P/Halley and 67P/Churyumov-Gerasimenko (67P/C-G) with independent in situ measurements of volatile and refractory budgets. The recently discovered semi-refractory ammonium salts in 67P/C-G are thought to be the missing nitrogen …

ch, fr, us, gb (code pays fourni par la source)

Gas Sources from the Coma and Nucleus of Comet 46P/Wirtanen Observed Using ALMA

Martin Cordiner, Nathan X. Roth, Stefanie N. Milam, Gerónimo Villanueva et autres

Gas-phase molecules in cometary atmospheres (comae) originate primarily from (1) outgassing by the nucleus, (2) sublimation of icy grains in the near-nucleus coma, and (3) coma (photo-)chemical processes. However, the majority of cometary gases observed at radio wavelengths have yet to be …

Molecular Outgassing in Centaur 29P/Schwassmann-Wachmann 1 During Its Exceptional 2021 Outburst: Coordinated Multi-Wavelength Observations Using nFLASH at APEX and iSHELL at the NASA-IRTF

Nathan X. Roth, Stefanie N. Milam, M. A. DiSanti, Gerónimo Villanueva et autres

The extraordinary 2021 September-October outburst of Centaur 29P/Schwassmann-Wachmann 1 afforded an opportunity to test the composition of primitive Kuiper disk material at high sensitivity. We conducted nearly simultaneous multi-wavelength spectroscopic observations of 29P/Schwassmann-Wachmann 1 using iSHELL at the NASA Infrared Telescope Facility …