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BELA transmitter performance and pointing stability verification campaign at DLR-PF
Michaelis, H.; Kallenbach, R.; Hussmann, H. +4 more
BELA is the first European planetary laser altimeter and shall be launched onboard of ESA's Mercury Planetary Orbiter (MPO) as part of the BepiColombo spacecraft in October 2018. The complete development of the instrument was done in collaboration with team members in Switzerland, Germany and Spain. The transmitter is also the first space-qualifie…
Erratum: MHD simulation of the solar wind flow around the coma of comet Churyumov-Gerasimenko during Rosetta's flyby
Baranov, V. B.; Alexashov, D. B.; Lebedev, M. G.
Hen 3-160 - the First Symbiotic Binary with Mira Variable S Star
Gromadzki, M.; Mikołajewska, J.; Iłkiewicz, K. +3 more
Hen 3-160 is reported in Belczyński et al. catalog as a symbiotic binary system with M7 giant donor. Using V- and I-band photometry collected over 20 years we have found that the giant is a Mira variable pulsating with 242.5-day period. The period-luminosity relation locates Hen 3-160 at the distance of about 9.4 kpc, and its Galactic coordinates …
A new method to determine the gravity field of small bodies from line-of-sight acceleration data
Barriot, Jean-Pierre; Rodriguez, J. Alexis P.; Yan, Jian-Guo +2 more
We present a new method to derive line-of-sight acceleration observables from spacecraft radio tracking data. The observables can be used to estimate the mass and gravity of a natural satellite as a spacecraft flyby. The corresponding observation model adapts to one-way and two/three-way tracking modes. As a test case for method validation and app…
On the saturation of acoustic mode frequencies at high solar activity
Rabello Soares, M. Cristina
Acoustic mode frequencies obtained by applying spherical harmonic decomposition to HMI, MDI, and GONG observations were analysed throughout the solar cycle. Evidence of a deviation from a linear relation with solar radio flux was found indicating a saturation effect at high solar activity. The Gompertz model, which is one of the most frequently us…
SX Piscium: A near-contact mass-transferring binary with a possible brown dwarf companion
Wang, Zhi Hua; Zhu, Li Ying
SX Psc is a short-period Algol-type eclipsing binary whose photometric analysis has long been ignored. Our photometric monitoring of this target covered from 2001 December to 2018 November. Aside from some curves observed at the primary eclipses, the complete four-color light curves in the BVRcIc band were also obtained. Phot…
Oblique Reflections of Mars Express MARSIS Radar Signals From Ionospheric Density Structures: Raytracing Analysis
Gurnett, D. A.; Němec, F.; Morgan, D. D. +2 more
Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) radar sounder on board the Mars Express spacecraft revealed oblique reflections coming systematically from apparently stable density structures in the Martian ionosphere. Although these were typically interpreted by assuming a straight line propagation of the sounding signal at th…
Inner Source Pickup Ions from Chondritic Smooth Interplanetary Dust Particles
Möbius, E.; Schwadron, N. A.; Quinn, P. R.
Inner source pickup ions (PUIs) are thought to be produced by the interaction between solar wind ions and interplanetary dust particles (IDPs). The amount of PUIs produced and their velocity distribution depend on the composition, density, porosity, and size of the IDPs. Quinn et al. simulated the production of PUIs from chondritic porous (CP) IDP…
Material of Cometary Nuclei and Asteroids can BE Studied in the Earth's Orbit
Vidmachenko, A. P.; Steklov, A. F.
The Solar system is formed from a primary gas-dust cloud. Asteroids and cometary nuclei are made of the same substance. Therefore, the study of their debris will help determine their properties. It is best to investigate the substance of meteoroids in the laboratory. The presence of radioactive chemical elements in meteorites provides important in…
Lunar Occultations with Aqueye+ and Iqueye
Naletto, Giampiero; Burtovoi, Aleksandr; Zampieri, Luca +8 more
We report the first-time use of the Aqueye+ and Iqueye instruments to record lunar occultation events. High time resolution recordings in different filters have been acquired for several occultations taken from 2016 January through 2018 January with Aqueye+ at the Copernicus telescope and Iqueye at the Galileo telescope in Asiago, Italy. Light cur…