Results 1 to 10 of about 466 (130)
On the attempts to measure water (and other volatiles) directly at the surface of a comet [PDF]
Philosophical Transactions Series A, Mathematical, Physical, and Engineering Sciences, 2017 The Ptolemy instrument on the Philae lander (of the Rosetta space mission) was able to make measurements of the major volatiles, water, carbon monoxide and carbon dioxide, directly at the surface of comet 67P/Churyumov–Gerasimenko. We give some background to the mission and highlight those instruments that have already given insights into the notion of
Ian Wright, S Sheridan
exaly +3 more sources
An Infrared Investigation of Volatiles in Comet 21P/Giacobini–Zinner [PDF]
Icarus, 1999 Abstract We obtained high resolution (λ/δλ∼10,000–20,000) infrared (IR) spectra of Comet 21P/Giacobini–Zinner (GZ) at five different wavelengths between 1.9 and 5.0 μm during 25–29 October 1998 using CSHELL at the NASA Infrared Telescope Facility (IRTF) on Mauna Kea.
Dominique Bockelée-Morvan +2 more
exaly +2 more sources
Testing Short-term Variability and Sampling of Primary Volatiles in Comet 46P/Wirtanen [PDF]
Planetary Science Journal, 2021 Abstract The exceptionally favorable close approach of Jupiter-family comet 46P/Wirtanen in 2018 December enabled characterization of its primary volatile composition with exceptionally high spatial resolution and sensitivities using the iSHELL spectrograph at the NASA Infrared Telescope Facility on Maunakea, HI.
Martin Cordiner +2 more
exaly +2 more sources
Parent Volatiles in Comet 9P/Tempel 1: Before and After Impact
Science, 2005 We quantified eight parent volatiles (H 2 O, C 2 H 6 , HCN, CO, CH 3 OH, H 2 CO, C 2 H 2 , and CH 4 ) in the Jupiter-family comet Tempel 1 using high-
Michael Disanti +2 more
exaly +4 more sources
Submillimetric spectroscopic observations of volatiles in comet C/2004 Q2 (Machholz) [PDF]
Astronomy and Astrophysics, 2012 We aim to determine the production rates of several parent and product volatiles and the 12C/13C isotopic carbon ratio in the long-period comet C/2004 Q2 (Machholz), which is likely to originate from the Oort Cloud. The line emission from several molecules in the coma was measured with high signal-to-noise ratio in January 2005 at heliocentric distance
MIGUEL De Val-Borro +2 more
exaly +6 more sources
COMETARY VOLATILES AND THE ORIGIN OF COMETS [PDF]
The Astrophysical Journal, 2012 We describe recent results on the CO/CO2/H2O composition of comets together with a survey of older literature (primarily for CO/H2O) and compare these with models of the protoplanetary disk. Even with the currently small sample, there is a wide dispersion in abundance ratios and little if any systematic difference between Jupiter-family comets (JFCs ...
A'Hearn, Michael F. +22 more
openaire +3 more sources
On the origin of O2 and other volatile species in comets [PDF]
Proceedings of the International Astronomical Union, 2017 AbstractMolecular oxygen, O2, was recently detected in comet 67P by the ROSINA instrument on board the Rosetta spacecraft with a surprisingly high abundance of 4% relative to H2O, making O2 the fourth most abundant in comet 67P. Other volatile species with similar volatility, such as molecular nitrogen N2, were also detected by Rosetta, but with much ...
Taquet, V.D.F. +3 more
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Constraints from Comets on the Formation and Volatile Acquisition of the Planets and Satellites [PDF]
Space Science Reviews, 2015 Comets play a dual role in understanding the formation and evolution of the solar system. First, the composition of comets provides information about the origin of the giant planets and their moons because comets formed early and their composition is not expected to have evolved significantly since formation.
Mandt, K. E. +6 more
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The Volatile Composition of Comets [PDF]
Highlights of Astronomy, 1989 ABSTRACTComets may be our best probes of the physical and chemical conditions in the outer regions of the solar nebula during that crucial period when the planets formed. The volatile composition of cometary nuclei, in particular, can be used to decide whether comets are the product of a condensation sequence similar to that invoked to explain the ...
openaire +2 more sources
Compact pebbles and the evolution of volatiles in the interstellar comet 2I/Borisov [PDF]
Nature Astronomy, 2021 12 pages, 4 ...
Bin Yang +8 more
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