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Guide star catalog generation of star sensors for interstellar navigation
Wu, Liang
In interstellar travel, parallax and stellar aberration have a non-negligible influence on the star identification of star sensors. Through the analysis of the working principle of star sensors, only the guide star catalog generation can solve this problem. The influence mechanism of parallax and stellar aberration is synthetically analyzed by fou…
Solar-cycle-related Changes in the Helium Ionization Zones of the Sun
Basu, Sarbani; Watson, Courtney B.
Helioseismic data for solar cycles 23 and 24 have shown unequivocally that solar dynamics changes with solar activity. Changes in solar structure have been more difficult to detect. Basu & Mandel had claimed that the then-available data revealed changes in the He II ionization zone of the Sun. The amount of change, however, indicated the need …
Understanding the Structure of Rapid Intensity Fluctuations in the Chromosphere with IRIS
De Pontieu, B.; Schmit, D.; Winebarger, A. +2 more
Several recent data sets have taken advantage of the unique capabilities of orbital and suborbital spacecraft to image the chromosphere and transition region at a very high cadence. We find that both the chromosphere and transition region exhibit spatially coherent transient features at frequencies above 80 mHz. We have analyzed narrowband imaging…
Doppler shifts and spectral line profile changes in the starlight scattered from an exoplanet
Anglada-Escudé, Guillem; Strachan, John B. P.
Scattered starlight from an exoplanet, commonly called reflected light, can be used to characterize the planet including the determination of its albedo and inclination of orbit. The relatively low flux ratio between directly observed starlight and starlight scattered off hot Jupiters make these systems the prime candidates for detection of reflec…
Plasma distribution around Comet 67P in the last month of the Rosetta mission
Szego, K.; Henri, P.; Nemeth, Z. +3 more
After accompanying comet 67P/Churyumov-Gerasimenko on its journey around the Sun and observing the evolution of its induced magnetosphere throughout the comet's life-cycle, the Rosetta operations concluded at the end of September 2016 with a controlled impact on the cometary nucleus. At that time, the comet was located more than 3.7 AU from the Su…
Micro- and nanolander on the surface of Ryugu - Commonalities, differences and lessons learned for future microgravity exploration
Ulamec, Stephan; Ho, Tra-Mi; Lange, Caroline +2 more
Recent Space missions to the small bodies in our Solar System have shown an increasing importance of in-situ investigations. Philae, the comet lander of the ESA Rosetta mission performed the first landing on such a small body and its results clearly enhanced the overall scientific output of the Rosetta mission. While Philae was a rather heavy (~10…
Identifying primitive noble gas components in lunar ferroan anorthosites
Gilmour, J. D.; Joy, K. H.; Pernet-Fisher, J. F.
Lunar ferroan anorthosites are the ideal samples for investigating primitive volatile systematics. Not only are these lithologies thought to be direct crystallization products of the Lunar Magma Ocean (LMO), but many samples display short (T38 < 5 Myr) cosmic ray exposure (CRE) ages, minimizing the effects of cosmic ray spallation re…
A survey for occultation astrometry of main belt: expected astrometric performances
Tanga, P.; Machado, P.; Corsaro, E. +1 more
Context. Occultations of stars by asteroids are an efficient method to study the properties of minor bodies, and can be exploited as tools to derive very precise asteroid astrometry relative to the target star. With the availability of stellar astrometry thanks to the ESA mission Gaia, the frequency of good predictions and the quality of the astro…
The first photometric investigation of the contact binary OQ Cam
Guo, Ya-Ni; Li, Kai; Xia, Qi-Qi +3 more
The first charge-coupled device photometric light curves in B, V, Rc, and Ic bands of the short-period contact binary star OQ Cam are presented. Through analyzing the light curves with the Wilson-Devinney code, it is found that OQ Cam is a W-type shallow contact binary star with a contact degree of f = 20.2%. Based on the O -…
Herschel-PACS photometry of the five major moons of Uranus
Balog, Z.; Marton, G.; Müller, T. G. +3 more
Aims: We aim to determine far-infrared fluxes at 70, 100, and 160 µm for the five major Uranus satellites, Titania, Oberon, Umbriel, Ariel, and Miranda. Our study is based on the available calibration observations at wavelengths taken with the PACS photometer aboard the Herschel Space Observatory.
Methods: The bright image of Uranu…