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Features of Designing a Star Catalog for Orientation Sensors of Space Vehicles
Avanesov, G. A.; Elyashev, Ya. D.
A brief history of the creation of star orientation sensors at the Space Research Institute of the Russian Academy of Sciences (IKI RAS) and star catalogs for them is presented. An experiment carried out in the early 1970s on synchronous photography of stars and the Earth's surface from the manned stations Salyut-2 and -3 is described. The difficu…
The K2 and TESS Synergy. III. Search and Rescue of the Lost Ephemeris for K2's First Planet
Vanderburg, Andrew; Bieryla, Allyson; Latham, David W. +13 more
K2-2 b/HIP 116454 b, the first exoplanet discovery by K2 during its Two-Wheeled Concept Engineering Test, is a sub-Neptune (2.5 ± 0.1 R ⊕, 9.7 ± 1.2 M ⊕) orbiting a relatively bright (K S = 8.03) K-dwarf star on a 9.1 day period. Unfortunately, due to a spurious follow-up transit detection and ephemeris degradati…
Mid-Infrared Studies of Oxides and Reduced Phases for the BepiColombo Mission to Mercury
Hiesinger, H.; Helbert, J.; Bauch, K. E. +6 more
We present mid-infrared reflectance spectra for oxides (e.g., spinel) and reduced phases (e.g., SiC), which will be part of a database for the ongoing ESA/JAXA BepiColombo mission to Mercury.
Testing MOND using the dynamics of nearby stellar streams
Helmi, Amina; Koop, Orlin
Context. The stellar halo of the Milky Way is built up at least in part from debris from past mergers. The stars from these merger events define substructures in phase space, for example in the form of streams, which are groups of stars that move on similar trajectories. The nearby Helmi streams discovered more than two decades ago are a well-know…
Radio and gamma-ray timing of TRAPUM L-band Fermi pulsar survey discoveries
Ransom, S. M.; Possenti, A.; Kramer, M. +18 more
This paper presents the results of a joint radio and gamma-ray timing campaign on the nine millisecond pulsars (MSPs) discovered as part of the L-band targeted survey of Fermi-LAT sources performed in the context of the Transients and Pulsars with MeerKAT (TRAPUM) Large Survey Project. Out of these pulsars, eight are members of binary systems; of …
Uncovering an Excess of X-Ray Point Sources in the Halos of Virgo Late-type Galaxies
Li, Zhiyuan; Hou, Meicun; Hu, Zhensong
We present a systematic search for extraplanar X-ray point sources around 19 late-type, highly inclined disk galaxies residing in the Virgo cluster, based on archival Chandra observations reaching a source detection sensitivity of L(0.5–8 keV) ∼ 1038 erg s‑1. Based on the cumulative source surface density distribution as a fu…
AGN feeding along a one-armed spiral in NGC 4593: A study using ALMA CO(2–1) observations
Andreani, P.; Hatziminaoglou, E.; Spinoglio, L. +9 more
Context. We investigate active galactic nuclei (AGN) feeding through the molecular gas (CO(2‑1) emission) properties of the local Seyfert 1 galaxy NGC 4593, using Atacama Large Millimeter Array (ALMA) observations and other multi-wavelength data. Aims. Our study aims to understand the interplay between the AGN and the interstellar medium (ISM) in …
Water Ice Resources on the Shallow Subsurface of Mars: Indications to Rover-Mounted Radar Observation
Orosei, Roberto; Zheng, Naihuan; Ding, Chunyu +1 more
The planet Mars is the most probable among the terrestrial planets in our solar system to support human settlement or colonization in the future. The detection of water ice or liquid water on the shallow subsurface of Mars is a crucial scientific objective for both the Chinese Tianwen-1 and United States Mars 2020 missions, which were launched in …
The variability structure function of the highest luminosity quasars on short time-scales
Tang, Ji-Jia; Wolf, Christian; Tonry, John
The stochastic photometric variability of quasars is known to follow a random-walk phenomenology on emission time-scales of months to years. Some high-cadence rest-frame optical monitoring in the past has hinted at a suppression of variability amplitudes on shorter time-scales of a few days or weeks, opening the question of what drives the suppres…
Performance evaluation of pansharpening for planetary exploration: A case study on the implementation of TGO CaSSIS with MRO HiRISE
Cremonese, G.; Thomas, N.; Re, C. +3 more
The present study analyses the potential of pansharpening algorithms for planetary exploration studies, testing their performance with the 4-band images from the Colour and Stereo Surface Imaging System (CaSSIS) aboard the Exomars 2016 Trace Grace Orbiter (TGO) using HiRISE images from the Mars Reconnaissance Orbiter (MRO) mission as the base. Due…