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Alignment procedure for the Gregorian telescope of the Metis coronagraph for the Solar Orbiter ESA mission
Susino, Roberto; Antonucci, Ester; Fineschi, Silvano +20 more
Metis is a solar coronagraph mounted on-board the Solar Orbiter ESA spacecraft. Solar Orbiter is scheduled for launch in February 2020 and it is dedicated to study the solar and heliospheric physics from a privileged close and inclined orbit around the Sun. Perihelion passages with a minimum distance of 0.28 AU are foreseen. Metis features two cha…
Strong southward and northward currents observed in the inner plasma sheet
Shen, Chao; Ji, Yong; Yang, Yan-Yan
It is generally believed that field-aligned currents (FACs) and the ring current (RC) are two dominant parts of the inner magnetosphere. However, using the Cluster spacecraft crossing the pre-midnight inner plasma sheet in the latitudinal region between 10 and 30∘ N, it is found that, during intense geomagnetic storms, in addition to FA…
Characterization of eclipsing binaries in High Latitude Field 356
Smits, Derck P.; Skelton, P. L.
Variable stars in HLF 356 identified from plates taken at Harvard Observatory southern station in the 1930s are characterised using data from the ASAS, SuperWASP and Catalina Sky Survey databases. Very little work has been done on these variables since their discovery. Their periods are determined, and light curves for these stars are presented, f…
Promising Neutron Detector with Anticoincidence Protection
Mitrofanov, I. G.; Litvak, M. L.; Sanin, A. B. +6 more
The method of remote neutron and gamma spectrometry of bodies in the solar system (the Moon, Mars, and Mercury) has been used for several decades to estimate the nuclear composition of these objects and the hydrogen abundance in their subsurface layers. Proportional gas counters based on helium-3 (3He), which have the maximum efficiency…
New Astrometric Reduction of the Supercosmos Plate Archive: First Results
Andruk, V. M.; Akhmetov, V. S.; Protsyuk, Yu. I. +2 more
The arrivals of the new more accuracy reference catalogs and development of new methods and approaches for reduction astrometric data give the new life for photographic plates archives. Gaia DR2 is not only a giant step in the astrometric accuracy allowing to measure new objects it also provides plates archives observed in the past with modern acc…
System Parameters for the Eclipsing B-star Binary BD+11°3569
Gies, Douglas R.; Matson, Rachel A.; Williams, Stephen J. +4 more
We present the results from a combined spectroscopic and photometric in-depth study of the binary system BD+11o3569 (B4 V + B5 V). Fits to Johnson V, Cousins R C and I C photometry, and radial velocities yield an orbital period of 1.49712598 ± 0.00000020 days and an inclination of 82.°93 ± 0.°17. The combined l…
New Observations and Transit Solutions of the Exoplanets HAT-P-54b and WASP-153b
Ibryamov, S.; Petrov, N.; Kjurkchieva, D.
We present photometric observations of the newly-discovered transiting exoplanets HAT-P-54b and WASP-153b with the Rozhen 2 m telescope. As a result we improved their periods. The modeling of the new transits led to almost identical values of orbital inclinations and stellar radii to the first published values while the planet radii were slightly …
Intra-day variability of three Seyfert galaxies measured with XMM-Newton
Tripathi, Ashutosh; Gu, Min-Feng; Liao, Mai +2 more
We present and analyze the variability of three Seyfert galaxies on intra-day timescales. We have analyzed in a uniform manner the 38 longest (>30 ks) observations made for NGC 4051, MCG-06-30-15 and NGC 4151 by XMM-Newton between 2000 and 2015. The nuclei were quite active during essentially all of these observations and the overall X-ray flux…
Synoptic Studies of the Sun as a Key to Understanding Stellar Astrospheres
Gosain, Sanjay; Ichimoto, Kiyoshi; Suematsu, Yoshinori +11 more
Ground-based solar observations provide key contextual data (i.e., the "big picture") to produce a complete description of the only astrosphere we can study in situ: our Sun's heliosphere. This white paper outlines the current paradigm for ground-based solar synoptic observations, and indicates those areas that will benefit from focused attention.
Formation Mechanism of Contact Binary Asteroid (4179) Toutatis
Hu, S. C.
Contact binary asteroids are a kind of single asteroids with bifurcated (or bi-lobed) configurations. Ground-based radar observations have shown that about 14% of near-Earth asteroids larger than 200 meters in diameter may be contact binaries. Specially, the targets of the three minor planet missions, Hayabusa, Chang'e-2, and Rosetta, have contact…