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SMART-OLEV—An orbital life extension vehicle for servicing commercial spacecrafts in GEO
Kaiser, Clemens; Sjöberg, Fredrik; Delcura, Juan Manuel +1 more
Orbital Satellite Services Limited (OSSL) is a satellite servicing company that is developing an orbit life extension vehicle (OLEV) to extend the operational lifetime of geostationary satellites. The industrial consortium of SSC (Sweden), Kayser-Threde (Germany) and Sener (Spain) is in charge to develop and industrialize the space and ground segm…
Observations of an active thin current sheet
Dandouras, I.; Lucek, E.; Fazakerley, A. N. +11 more
We analyze observations of magnetotail current sheet dynamics during a substorm between 2330 and 2400 UT on 28 August 2005 when Cluster was in the plasma sheet at [-17.2, -4.49, 0.03] RE (GSM) with the foot points near the IMAGE ground-based network. Observations from the Cluster spacecraft, ground-based magnetometers, and the IMAGE sat…
A Broadband Microwave Burst Produced by Electron Beams
Melnikov, V. F.; Fleishman, G. D.; Huang, G. -L. +1 more
The theoretical and experimental study of fast electron beams attracts much attention in astrophysics and the laboratory. In the case of solar flares, the problem of reliable beam detection and diagnostics is of exceptional importance. This paper explores the fact that electron beams moving obliquely to the magnetic field or along the field with s…
Diagnostics of Titan's stratospheric dynamics using Cassini/CIRS data and the 2-dimensional IPSL circulation model
Teanby, N. A.; Bézard, B.; Lebonnois, S. +6 more
The dynamics of Titan's stratosphere is discussed in this study, based on a comparison between observations by the CIRS instrument on board the Cassini spacecraft, and results of the 2-dimensional circulation model developed at the Institute Pierre-Simon Laplace, available at http://www.lmd.jussieu.fr/titanDbase [Rannou, P., Lebonnois, S., Hourdin…
Low-Level Nuclear Activity in Nearby Spiral Galaxies
Fiore, Fabrizio; Mathur, Smita; Ferrarese, Laura +1 more
We are conducting a search for supermassive black holes (SMBHs) with masses below ~107 M⊙ by looking for signs of extremely low-level nuclear activity in nearby galaxies that are not known to be AGNs. Our survey has the following characteristics: (1) X-ray selection using the Chandra X-Ray Observatory, since X-rays are a ubiq…
Ferric oxides in East Candor Chasma, Valles Marineris (Mars) inferred from analysis of OMEGA/Mars Express data: Identification and geological interpretation
Sotin, Christophe; Le Mouélic, Stéphane; Gendrin, Aline +7 more
The mineralogical composition of the Martian surface is constrained by analyzing the data of the OMEGA visible and near infrared imaging spectrometer onboard Mars Express. Ferric signatures had previously been reported in Valles Marineris, Margaritifer Terra, and Terra Meridiani. Here we use three independent data reduction methods (Spectral Angle…
Structure and density of cometary nuclei
Weissman, Paul R.; Lowry, Stephen C.
Understanding the nature of the cometary nucleus remains one of the major problems in solar system science. Whipple’s (1950) icy conglomerate model has been very successful at explaining a range of cometary phenomena, including the source of cometary activity and the nongravitational orbital motion of the nuclei. However, the internal structure of…
VLBI Astrometry of AGB Variables with VERA --- A Semiregular Variable S Crateris ---
Hirota, Tomoya; Kurayama, Tomoharu; Honma, Mareki +40 more
We present a distance measurement for the semiregular variable S Crateris (S Crt) based on its annual parallax. With the unique dual beam system of the VLBI Exploration for Radio Astrometry (VERA) telescopes, we measured the absolute proper motion of a water maser spot associated with S Crt, referred to the quasar J1147-0724 located at an angular …
VLT Spectroscopy of Globular Clusters in Low Surface Brightness Dwarf Galaxies
Puzia, Thomas H.; Sharina, Margarita E.
We present VLT/FORS2 spectroscopic observations of globular clusters (GCs) in five low surface brightness dwarf galaxies: KK 211 and KK 221, both dwarf spheroidal satellites (dSph) of NGC 5128; dSph KK 84 located close to the isolated S0 galaxy NGC 3115; and two isolated dwarf irregular (dIrr) galaxies, UGC 3755 and ESO 490-17. Our sample is selec…
Infrared (0.83 5.1 µm) photometry of Phoebe from the Cassini Visual Infrared Mapping Spectrometer
Brown, R. H.; Buratti, B. J.; Clark, R. N. +8 more
Three weeks prior to the commencement of Cassini's 4 year tour of the saturnian system, the spacecraft executed a close flyby of the outer satellite Phoebe. The infrared channel of the Visual Infrared Mapping Spectrometer (VIMS) obtained images of reflected light over the 0.83-5.1 µm spectral range with an average spectral resolution of 16.5…