Search Publications
SWAN observations of 9P/Tempel 1 around the Deep Impact event
Bertaux, Jean-Loup; Combi, Michael R.; Mäkinen, J. Teemu T. +2 more
The SWAN instrument observed the coma of Comet 9P/Tempel 1 at Lyman alpha around the Deep Impact event. From these observations, a water production rate profile for 3 weeks after the impact was derived. The comet could not be identified in images taken before the impact because of the relatively low production rates. The most important feature of …
Comet Hale Bopp in outburst: Imaging the dynamics of icy particles with HST/NICMOS
Campins, H.; Larson, S.; Stolovy, S. R. +3 more
Comet Hale-Bopp was imaged at wavelengths from 1.87 to 2.22 µm by HST/NICMOS in post-perihelion observations starting on UT 1997 August 27.95. Diffraction-limited (∼0 .″2) images were obtained at high signal-to-noise (∼1500) to probe the composition and dynamics of the inner coma and also the size and activity of the nucleus. The velocities …
A description of surface features in north Tyrrhena Terra, Mars: Evidence for extension and lava flooding
Greeley, Ronald; Neukum, Gerhard; Ori, Gian Gabriele +4 more
We studied north Tyrrhena Terra, an approximately 39,000 km 2 area, located in the transition region straddling the Amenthes and Mare Tyrrhenum Mars Chart quadrangles 14 and 22, respectively. The study area comprises ancient terrains with infilled craters, ridges and valleys. Interpretation of orbiter data of ancient terrains is inheren…
The 2003 November 14 occultation by Titan of TYC 1343-1865-1. II. Analysis of light curves
Dhillon, V. S.; Irwin, P. G. J.; Taylor, F. W. +6 more
We observed a stellar occultation by Titan on 2003 November 14 from La Palma Observatory using ULTRACAM with three Sloan filters: u, g, and i (358, 487, and 758 nm, respectively). The occultation probed latitudes 2° S and 1° N during immersion and emersion, respectively. A prominent central flash was present in only the i filter, indicating wavele…
Observations of Comet 9P/Tempel 1 around the Deep Impact event by the OSIRIS cameras onboard Rosetta
Bertaux, Jean-Loup; Naletto, Giampiero; Debei, Stefano +36 more
The OSIRIS cameras on the Rosetta spacecraft observed Comet 9P/Tempel 1 from 5 days before to 10 days after it was hit by the Deep Impact projectile. The Narrow Angle Camera (NAC) monitored the cometary dust in 5 different filters. The Wide Angle Camera (WAC) observed through filters sensitive to emissions from OH, CN, Na, and OI together with the…
Keck NIRC2 photometry of Uranus, uranian satellites, and Triton in August 2004
Sromovsky, L. A.; Fry, P. M.
On August 11, 2004, we made adaptive optics observations of the Uranus and Neptune systems with the Keck II Near Infrared Camera. Uranus and Triton were observed in three broadband filters (J, H, and K-prime) and four narrowband filters [Hcont, FeII, He1_B, and H2(v=1-0)]. Miranda, Ariel, Umbriel, and Oberon were observed in the four narrowband fi…
Influence of aerosol multiple scattering of ultraviolet radiation on martian atmospheric sensing
Zorzano, M. -P.; Córdoba-Jabonero, C.
The ultraviolet (UV) radiative transfer problem in the martian atmosphere is dominated by multiple scattering of photons with the micron-sized aerosols that are suspended in the thin atmosphere. By implementing a multiple stream, vertical fine layering description of the radiative transfer equation that is able to cope with the strong vertical var…
Albedo and photometric study of Mars with the Planetary Fourier Spectrometer on-board the Mars Express mission
Colangeli, L.; Formisano, V.; Palomba, E. +3 more
The Short Wavelength Channel of the Planetary Fourier Spectrometer (PFS) covers the 8333-1750 cm-1 (1.2-5.7 µm) spectral range, that is well suited to study the reflectance properties of the martian soil. These properties vary with time due to the dust dynamics in the martian environment. Wind can blow off dust exposing soil and f…
Examining the wake structure in Saturn's rings from microwave observations over varying ring opening angles and wavelengths
de Pater, Imke; Molnar, Lawrence A.; Dunn, David E.
Over the last 15 to 20 years several high quality, high resolution data have been taken with the very large array (VLA). These data exhibit a wide range of ring opening angles ( |B|=0 to 26°) and wavelengths ( λ=0.7 to 20 cm). At these wavelengths the primary flux from the rings is scattered saturnian thermal emission, with a small contribution co…
Evidence for enhanced hydration on the northern flank of Olympus Mons, Mars
Bibring, Jean-Pierre; Langevin, Yves; Poulet, François +7 more
In this paper we report about a small region on the northern scarp of Olympus Mons showing an increase of the 3 µm hydration band in the OMEGA spectra, together with low superficial temperatures. Although water ice clouds can occurs on the flank of big martian volcanoes, radiative transfer modeling indicates that atmospheric water ice alone …