Search Publications
Spacecraft exploration of asteroids
Shevchenko, V. G.; Mohamed, R. A.
The past, current, and planned space missions for asteroid exploration are reviewed. The main results based on observations performed with satellites in near-Earth orbits (OAO-2, IUE, FIRSSE, IRAS, HST, Hipparcos, ISO, MSX) and space probes sent to particular objects (Galileo, NEAR, DS1, Stardust) are reported. Future space missions (MUSES-C, Rose…
Keck infrared observations of Saturn's main rings bracketing Earth's August 1995 ring plane crossing
de Pater, Imke; Showalter, Mark R.; Lissauer, Jack J. +1 more
We present results of near-infrared (2.26 µm) observations of Saturn's main rings taken with the W.M. Keck telescope during August 8-11, 1995, surrounding the time that Earth crossed Saturn's ring plane. These observations provide a unique opportunity to study the evolution of the ring brightness in detail, and by combining our data with Hub…
ISO Observations of Pre-Stellar Cores and Young Stellar Objects
Ward-Thompson, Derek; Nisini, Brunella; van Dishoeck, Ewine F. +1 more
We summarize the observations of the Infrared Space Observatory (ISO) concerning the earliest stages of the stellar formation. The observations of samples of sources in different evolutionary stages are reviewed, addressing in particular how the physical and chemical properties of the protostellar environments change from the pre-stellar cores to …
Comparison of the Sacramento Peak Fe XIV Index with a Model Index Computed from Differential Emission Measure Maps
Newmark, J. S.; Cook, J. W.; Altrock, R. C.
We compare the Sacramento Peak Fe XIV 5303 Å green line index with a model index time series for the period of operations of the EUV Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory (SOHO), covering the years 1996-2002, from cycle minimum past the peak of the current activity cycle 23. We compute a differential emission meas…
Variable Star Candidates in an Advanced Camera for Surveys Field of M31
Williams, Benjamin F.
A search for variable stars is performed using two epochs of Hubble Space Telescope Advanced Camera for Surveys imaging data for a 9.28 arcmin2 portion of M31. This data set reveals 254 sources that vary by at least 4 σ between epochs. The positions and two-epoch B-band (equivalent) photometry of these sources are presented. The photome…
The COSMOS 2-degree HST/ACS survey [review article]
Koekemoer, Anton M.; Scoville, Nick Z.
The COSMOS survey is the largest contiguous imaging project ever undertaken with the Hubble Space Telescope, using ACS/WFC to image a 2 square degree low-background equatorial field in 600 orbits with the F814W ( I) filter. The survey is providing over 2 million objects with a 10σ detection limit AB( I) < 27, with a sky coverage of 10 billion A…
The HeI abundance in Solar filaments
Chiuderi Drago, F.
Three filaments observed with the CDS instrument on the SOHO satellite are analysed to determine the HeI/HI ratio. The HI and Hel bound-free absorptions are the major processes responsible for the lower intensity of transition region (TR) lines observed above filaments. One of the filaments was also observed by SUMER at λ > 912 Å, thus supplyin…
The electric potential at the Earth's quasi-parallel bow shock: Initial Cluster results
André, M.; Bale, S. D.; Lucek, E. A. +2 more
We present multi-spacecraft measurements of a quasi-parallel shock crossing obtained by the Cluster satellites. Observations commonly show the presence of Short Large-Amplitude Magnetic Structures (SLAMS) at the Earth's quasi-parallel bow shock. These structures are thought to play an important role for decelerating, heating and deflecting the inc…
What is Cluster telling us about magnetotail dynamics?
Nakamura, Rumi; Baumjohann, Wolfgang
In this review, we report on some new aspects of magnetotail dynamics found in the data of the first traversal of the magnetotail by the Cluster quartet in summer and autumn 2001: (1) The electron drift instrument made the first direct measurements of tail lobe convection. The statistical data shows convection toward the center of the plasma sheet…
A search for temporal variability in the surface chemistry of the icy Galilean satellites
Hendrix, Amanda; Domingue, Deborah
The purpose of this study was to determine if any temporal variability in the broadband UV spectral properties of the icy Galilean satellites exists, and if so, to characterize its spatial distribution as a function of longitude in order to attempt to correlate any temporal changes with satellite surface interactions with the space environment. Th…