Results 1 to 10 of about 550,094 (191)
The Planetary Science JournalComet C/2020 F3 (NEOWISE) reached perihelion on 2020 July 3 at 0.29 au and exhibited a highly structured dust tail. Using a simplified Finson–Probstein model, structures such as striae, observed in the tail in images obtained by the Parker Solar Probe ...
Qasim Afghan +4 more
doaj +1 more source
Down But Not Out: The Case of Long-period Comet C/2021 O3 (Panstarrs)
The Astronomical JournalWe combine ground- and space-based observations of long-period comet C/2021 O3 (Panstarrs; perihelion distance 0.287 au) in order to investigate its reported near-perihelion destruction.
David Jewitt +3 more
doaj +1 more source
The Astrophysical Journal LettersComets are frozen remnants of our solar system’s formation, and comparing their chemical composition to that of planet-forming systems can reveal crucial insights about our origins, potentially answering one of the most challenging questions in planetary
Manuela Lippi +7 more
doaj +1 more source
Investigation of Split Comet 240P/NEAT
The Astronomical JournalWe present time-series observations of the split comet 240P/NEAT near perihelion, obtained using the Nordic Optical Telescope. The brighter component, 240P-A, has an estimated radius in the range 400–600 m, and loses dust at the peak rate 130 kg s ^−1 ...
David Jewitt, Jane Luu, Yoonyoung Kim
doaj +1 more source
The Interstellar Heritage of Comets
The Astronomical JournalComets have similar compositions to interstellar medium ices, suggesting at least some of their molecules may be inherited from an earlier stage of evolution.
Karen Willacy +7 more
doaj +1 more source
Gelato: A Mission Concept for Comet Surface Sample Return
The Planetary Science JournalUnderstanding the role of comets in solar system formation and evolution has continued to be a driving question in planetary science. It is believed that comets host a record of presolar history and early planet formation and likely delivered volatiles ...
Mallory J. Kinczyk +20 more
doaj +1 more source
A JWST Study of the Remarkable Oort Cloud Comet C/2017 K2 (PanSTARRS)
The Planetary Science JournalComets, 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 +6 more
doaj +1 more source
Unraveling the Water Sources in Comet 103P/Hartley 2 from Deep Impact Flyby Observations
The Planetary Science JournalThe 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
doaj +1 more source
CO and N2 Produced from H2O, CO2, and NH3 Cometary Ice Analogs
The Astrophysical JournalHypervolatile species such as carbon monoxide (CO) and molecular nitrogen (N _2 ) have been detected in comets, and could be used to constrain comet formation temperature conditions if their presence is due to freeze-out and/or entrapment.
Alexandra McKinnon +5 more
doaj +1 more source
International Astronomical Union Colloquium, 1977 Empirical data are confronted with different hypotheses on the origin of comets. The hypotheses are classified into three categories: 1) Comets were condensed from the solar nebula and ejected later into the Oort’s cloud. 2) Comets were condensed in situ, more or less recently, on their present trajectories; 3) Reversing the arrow of time in the ...
openaire +1 more source