Results 1 to 10 of about 681,612 (216)

Exogenic origin for the volatiles sampled by the Lunar CRater Observation and Sensing Satellite impact [PDF]

Nature Communications, 2022
The water and other volatiles observed in the LCROSS impact plume contained too much nitrogen to have originated from volcanic outgassing. These volatiles, stored in the top 1-3 meters of the Cabeus permanently shaded region, were delivered by comet ...
K. E. Mandt, O. Mousis, D. Hurley, A. Bouquet, K. D. Retherford, L. O. Magaña, A. Luspay-Kuti   +6 more
doaj   +4 more sources

Comprehensive Study of the Chemical Composition and Spatial Outgassing Behavior of Hyperactive Comet 46P/Wirtanen Using Near-IR Spectroscopy during its Historic 2018 Apparition

The Astronomical Journal, 2023
We present a comprehensive analysis of the chemical composition of the Jupiter-family comet and potential spacecraft target 46P/Wirtanen, in the near-IR wavelength range.
Younas Khan, Erika L. Gibb, Nathan X. Roth, Michael A. DiSanti, Neil Dello Russo, Boncho P. Bonev, Chemeda T. Ejeta, Mohammad Saki, Ronald J. Vervack Jr., Adam J. McKay, Hideyo Kawakita, Michael R. Combi, Danna Qasim, Yinsi Shou   +13 more
doaj   +2 more sources

Strongly Depleted Methanol and Hypervolatiles in Comet C/2021 A1 (Leonard): Signatures of Interstellar Chemistry?

The Planetary Science Journal, 2023
We measured the chemical composition of comet C/2021 A1 (Leonard) using the long-slit echelle grating spectrograph iSHELL/IRTF on 2021 December 20 and on 2022 January 8 and 9.
Sara Faggi, Manuela Lippi, Michael J. Mumma, Geronimo L. Villanueva   +3 more
doaj   +2 more sources

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

The Astronomical Journal, 2023
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.
Boncho P. Bonev, Neil Dello Russo, Hideyo Kawakita, Ronald J. Vervack Jr., Michael A. DiSanti, Yoshiharu Shinnaka, Takafumi Ootsubo, Erika L. Gibb, Michael R. Combi, Kathrin Altwegg, Nicolas Biver, Jacques Crovisier, Gregory Doppmann, Geronimo L. Villanueva, Younas Khan, Chemeda T. Ejeta, Mohammad Saki, Adam J. McKay, Anita L. Cochran, Emmanuel Jehin, Nathan X. Roth, Martin A. Cordiner, Yinsi Shou   +22 more
doaj   +2 more sources

Coma Abundances of Volatiles at Small Heliocentric Distances: Compositional Measurements of Long-period Comet C/2020 S3 (Erasmus)

The Astronomical Journal, 2023
We report production rates of H _2 O and nine trace molecules (C _2 H _6 , CH _4 , H _2 CO, CH _3 OH, HCN, NH _3 , C _2 H _2 , OCS, and CO) in long-period comet C/2020 S3 (Erasmus) using the high-resolution, cross-dispersed infrared spectrograph (iSHELL)
Chemeda Ejeta, Erika Gibb, Nathan Roth, Michael A. DiSanti, Neil Dello Russo, Mohammad Saki, Adam J. McKay, Hideyo Kawakita, Younas Khan, Boncho P. Bonev, Ronald J. Vervack Jr., Michael R. Combi   +11 more
doaj   +2 more sources

Infrared Compositional Measurements in Comet C/2017 K2 (Pan-STARRS) at Heliocentric Distances Beyond 2.3 au [PDF]

The Astronomical Journal
Comet C/2017 K2 (Pan-STARRS) provided a rare opportunity to investigate the evolution of coma composition and outgassing patterns over a transitional heliocentric distance ( R _h ) range where activity drivers in comets are thought to change from ...
Chemeda Ejeta, Erika Gibb, Michael A. DiSanti, Hideyo Kawakita, Boncho P. Bonev, Neil Dello Russo, Nathan X. Roth, Younas Khan, Adam J. McKay, Michael R. Combi, Lori Feaga, Mohammad Saki, Ronald J. Vervack Jr, Yinsi Shou   +13 more
doaj   +2 more sources

The Pre-perihelion Evolution of the Activity of Comet C/2017 K2 (Pan-STARRS) during the Water Ice-line Crossover [PDF]

The Astronomical Journal
Comets, relics from the early solar system, consist of dust and ice. The ice sublimates as comets approach the Sun, ejecting dust from their nuclei seen as activity.
Yuna G. Kwon, Stefano Bagnulo, Johannes Markkanen, Ludmilla Kolokolova, Jessica Agarwal, Manuela Lippi, Zuri Gray   +6 more
doaj   +2 more sources

Spectroscopic identification of water emission from a main-belt comet [PDF]

Nature, 2023
Michael S Kelley, Henry H Hsieh, Stefanie Milam   +2 more
exaly   +2 more sources

Oxygen-bearing organic molecules in comet 67P's dusty coma: First evidence for abundant heterocycles [PDF]

Astronomy & Astrophysics, 2023
The puzzling complexity of terrestrial biomolecules is driving the search for complex organic molecules in the Interstellar Medium (ISM) and serves as a motivation for many in situ studies of reservoirs of extraterrestrial organics from meteorites and ...
N. Hanni, K. Altwegg, D. Baklouti, M. Combi, S. Fuselier, J. D. Keyser, D. Muller, M. Rubin, S. Wampfler   +8 more
semanticscholar   +1 more source

Direct Simulation Monte Carlo Modeling of Ammonia in Comet C/2014 Q2 (Lovejoy)

The Astronomical Journal, 2023
Ammonia (NH _3 ), likely the most abundant nitrogen-bearing molecule in cometary ices followed by hydrogen cyanide, is believed to be stored in the nucleus predominantly as a parent ice.
Hideyo Kawakita, Neil Dello Russo, Ronald J. Vervack Jr., Michael A. DiSanti, Boncho P. Bonev, Hitomi Kobayashi, Daniel C. Boice, Yoshiharu Shinnaka   +7 more
doaj   +1 more source