Results 1 to 10 of about 1,376 (293)

Unraveling the Water Sources in Comet 103P/Hartley 2 from Deep Impact Flyby Observations

The Planetary Science Journal
The Deep Impact eXtended Mission flyby of comet 103P/Hartley 2 offered a rare opportunity to study a hyperactive comet with high-cadence and high-resolution observations from a fixed vantage point.
L. M. Feaga, J. M. Sunshine
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Inferring the CO2 Abundance in Comet 45P/Honda-Mrkos-Pajdušáková from [O i] Observations: Implications for the Source of Icy Grains in Cometary Comae

The Planetary Science Journal
The study of cometary composition is important for understanding our solar system's early evolutionary processes. Carbon dioxide (CO _2 ) is a common hypervolatile in comets that can drive activity but is more difficult to study than other hypervolatiles
Mikayla R. Huffman, Adam J. McKay, Anita L. Cochran   +2 more
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Early CN Outgassing and Production Rates of C/2024 E1 (Wierzchos) at 4 au

The Planetary Science Journal
The study of cometary activity at large heliocentric distances provides insights into the volatile release processes in the outer solar system. Early models predicted cometary activity was driven primarily by sublimation of water and therefore would ...
A. C. Mura, F. La Forgia, M. Lazzarin, G. Cremonese, P. Cambianica, G. Munaretto, A. Farina, F. Cusano, E. Marini   +8 more
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Photodissociation of dicarbon: How nature breaks an unusual multiple bond. [PDF]

Proc Natl Acad Sci U S A, 2021
Borsovszky J, Nauta K, Jiang J, Hansen CS, McKemmish LK, Field RW, Stanton JF, Kable SH, Schmidt TW.   +8 more
europepmc   +1 more source

Coma Physics of an Interstellar Object: JWST Spatial–Spectral Mapping of 3I/ATLAS

The Astrophysical Journal Letters
We report a survey of molecular emission from cometary volatiles using the James Webb Space Telescope (JWST) toward interstellar object 3I/ATLAS carried out on UT 2025 December 22 and 23 at a heliocentric distance ( r _H ) of 2.37–2.41 au.
Nathan X. Roth, Martin A. Cordiner, Stefanie N. Milam, Geronimo L. Villanueva, Steven B. Charnley, Nicolas Biver, Dominique Bockelée-Morvan, Dennis Bodewits, Steven J. Bromley, Jacques Crovisier, Maria N. Drozdovskaya, Sara Faggi, Davide Farnocchia, Kenji Furuya, Michael S. P. Kelley, Marco Micheli, John W. Noonan, Cyrielle Opitom, Megan E. Schwamb, Cristina A. Thomas   +19 more
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Exploring the vacuum ultraviolet photochemistry of astrochemically important triatomic molecules. [PDF]

Natl Sci Rev, 2023
Chang Y, Ashfold MNR, Yuan K, Yang X.
europepmc   +1 more source

A JWST Study of the Remarkable Oort Cloud Comet C/2017 K2 (PanSTARRS)

The Planetary Science Journal
Comets, during their journeys into the inner solar system, deliver volatile gases, organics, and particulates into their comae that provide crucial information for assessing the physicochemical conditions in the outer disk from which they formed. Here we
Charles E. Woodward, Dominique Bockélee-Morvan, David E. Harker, Michael S. P. Kelley, Nathan X. Roth, Diane H. Wooden, Stefanie N. Milam   +6 more
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Optical and Near-infrared Spectroscopy of the Outbursting Comet 12P/Pons-Brooks

The Astrophysical Journal
We present optical and near-infrared (NIR) observations of the outbursting, Halley-type comet 12P/Pons-Brooks (12P). Three NIR spectra were obtained during two outbursts in 2023 October and November, with the 3 m Infrared Telescope Facility and the ...
Ruining Zhao, Bin Yang, Michael S. P. Kelley, Silvia Protopapa, Aigen Li, Yang Huang, Jifeng Liu   +6 more
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Interstellar Object 3I/ATLAS Observed from Mars by China’s Tianwen-1 Spacecraft

The Astrophysical Journal Letters
China’s Tianwen-1 Mars orbiter successfully imaged the third interstellar object, 3I/ATLAS, during its close encounter with Mars using the onboard HiRIC CMOS camera. This is China’s first deep-space observation of an astronomical object.
Xin Ren, Wei Yan, Ruining Zhao, Shu Wang, Xingye Gao, Qiang Fu, Qing Zhang, Bin Yang, Man-To Hui, Zhiyong Xiao, Xiaodong Liu, Cunhui Li, Renhao Tian, Wenguang Liu, Dong Wang, Shaoran Liu, Cong Ren, Jie Dong, Xinbo Zhu, Pan Xie, Jian-Yang Li, Yan Geng, Jianjun Liu   +22 more
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Postperihelion Coma Composition of the Interstellar Comet 3I/ATLAS from Optical Spectroscopy

The Astrophysical Journal Letters
We present multiepoch optical spectroscopy of the interstellar comet 3I/ATLAS obtained between 2025 December and 2026 January (heliocentric distances of 1.8–3.3 au), yielding postperihelion production rates and mixing ratios for CN, C _3 , C _2 , CH, and
Ruining Zhao, Xiliang Zhang, Bin Yang, Xiangyu Fan, Shu Wang, Yang Huang, Jifeng Liu   +6 more
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