Results 101 to 110 of about 32,395 (222)

Infrared observations of periodic comets [PDF]

Selected comets are observed in the infrared with the NASA Infrared Telescope Facility (IRTF) and other telescopes as appropriate. The scientific objectives are to characterize the thermal emission from the dust coma, derive dust productions rates ...
Hanner, S.
core   +1 more source

Spatial Distribution of H2O+ Ions in the Inner Coma of C/2014 Q2 (Lovejoy)

The Astrophysical Journal
Neutral molecules that sublimate from cometary ices (mainly water at ∼1 au from the Sun) are ionized due to solar extreme-ultraviolet radiation and collisions with highly energetic electrons.
Hideyo Kawakita, Yoshiharu Shinnaka, Hitomi Kobayashi   +2 more
doaj   +1 more source

Photometric and spectroscopic monitoring of the outbursting Halley-type comet 12P/Pons-Brooks

Astronomy & Astrophysics
Context. Comet 12P/Pons-Brooks is a Halley-type comet known for its outbursting activity during its previous perihelia in 1883 and 1953. Its strong activity and favourable observing geometry gave a great opportunity to study this outburst-prone comet ...
Vander Donckt M., Jehin E., Aravind K., Adami C., Hmiddouch S., Manfroid J., Ganesh S., Benkhaldoun Z., Delsanti A.   +8 more
doaj   +1 more source

The Dust Trail of Comet 67P/Churyumov-Gerasimenko

, 2007
We report the detection of comet 67P/Churyumov-Gerasimenko's dust trail and nucleus in 24 micron Spitzer Space Telescope images taken February 2004. The dust trail is not found in optical Palomar images taken June 2003.
A'Hearn, A'Hearn, A'Hearn, Agarwal, Agarwal, Brownlee, Burns, Colangeli, David J. Lien, Fernández, Fomenkova, Fukugita, Fulle, Fulle, Fulle, Fulle, Gehrz, Giorgini, Glassmeier, Green, Groussin, Groussin, Hanner, Harker, Harker, Harris, Hörz, Ishiguro, Ishiguro, Ishiguro, Jenniskens, Jenniskens, Keller, Kidger, Kimura, Kolokolova, Lamy, Lamy, Lamy, Lasue, Lebofsky, Levasseur-Regourd, Lisse, Lisse, Lisse, Lisse, Mathis, McDonnell, McDonnell, Meech, Michael S. Kelley, Neckel, Osip, Reach, Reach, Rieke, Schleicher, Smith, Spencer, Spitzer Science Center, Sykes, Sykes, Vaubaillon, Werner, William T. Reach   +64 more
core   +1 more source

Comets: Gases, ices, grains and plasma [PDF]

The program and abstracts of the 97 papers delivered at the colloquium are presented. Cometary nuclei, comet dust, the coma, ion tails, several comet missions, and cometary origin and evolution were ...
Wilkening, L. L.
core   +1 more source

Dual Sources of S2 Observed in Comet 67P: Insights from Comparing ROSINA Measurements and Laboratory Simulations

The Planetary Science Journal
Hydrogen sulfide (H _2 S) is the fifth most abundant molecule observed in the coma of comet 67P/Churyumov–Gerasimenko (67P). Prior to its incorporation into cometary materials, H _2 S likely underwent ultraviolet (UV) radiation exposure, which is thought
Ahmed Mahjoub, Robert Hodyss, Kathrin Altwegg, Edith Fayolle, Mathieu Choukroun   +4 more
doaj   +1 more source

The dust coma of Comet Austin (1989c1) [PDF]

Thermal-infrared (10 and 20 micron) images of Comet Austin were obtained on UT 30.6 Apr., 1.8, 2.8, and 3.6 May 1990. The NASA-Marshall Space Flight Center 20 pixel bolometer array at the NASA 3 meter Infrared Telescope Facility in Hawaii was used.
Benson, C., Campins, Humberto, Tegler, Stephen C., Telesco, C. M.   +3 more
core   +1 more source

The composition of heavy molecular ions inside the ionopause of Comet Halley [PDF]

The RPA2-PICCA instrument aboard the Giotto spacecraft obtained 10-210 amu mass spectral of cold thermal molecular ions in the coma of Comet Halley. The dissociation products of the long chain formaldehyde polymer polyoxymethylene (POM) have recently ...
Anderson, K. A., Carlson, C. W., Curtis, D. W., Duston, C., Korth, A., Lin, R. P., Mendis, D. A., Mitchell, David L., Reme, H., Sauvaud, J. A.   +9 more
core   +1 more source

High-resolution imaging of solar system objects [PDF]

The strategy of this investigation has been to develop new high-resolution imaging capabilities and to apply them to extended observing programs. These programs have included Io's neutral sodium cloud and comets.
Goldberg, Bruce A.
core   +1 more source

The Volatile Composition and Activity Evolution of Main-belt Comet 358P/PANSTARRS

The Planetary Science Journal
We report the detection of water vapor associated with main-belt comet 358P/PANSTARRS on UT 2024 January 8–9 using the NIRSPEC instrument on board JWST.
Henry H. Hsieh, John W. Noonan, Michael S. P. Kelley, Dennis Bodewits, Jana Pittichová, Audrey Thirouin, Marco Micheli, Matthew M. Knight, Michele T. Bannister, Colin O. Chandler, Carrie E. Holt, Matthew J. Hopkins, Yaeji Kim, Nicholas A. Moskovitz, William J. Oldroyd, Jack Patterson, Scott S. Sheppard, Nicole Tan, Chadwick A. Trujillo, Quanzhi Ye   +19 more
doaj   +1 more source