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The five largest satellites of Uranus: Astrometric observations spread over 29 years at the Pico dos Dias Observatory
Fienga, A.; Assafin, M.; Camargo, J. I. B. +2 more
We present the astrometry of the five largest satellites of Uranus from observations spread over almost three decades with photographic plates and CCDs (mainly), taken at the Pico dos Dias Observatory - Brazil. All positions presented here are obtained from the reanalysis of measurements and images used in previous publications. Reference stars ar…
Evolution of coronal hole solar wind in the inner heliosphere: Combined observations by Solar Orbiter and Parker Solar Probe
Perri, S.; Lavraud, B.; Maksimovic, M. +18 more
We study the radial evolution, from 0.1 AU to the Earth, of a homogeneous recurrent fast wind, coming from the same source on the Sun, by means of new measurements by both Solar Orbiter and Parker Solar Probe. With respect to previous radial studies, we extend, for the first time, the analysis of a recurrent fast stream at distances never reached …
WD 1145+017: Alternative models of the atmosphere, dust clouds, and gas rings
Budaj, J.; Hubeny, I.; Maliuk, A.
Context. WD 1145+017 (WD1145) is the first white dwarf known to be orbited by disintegrating exoasteroids. It is a DBZ-type white dwarf with strongly variable broad circumstellar lines and variable shallow ultraviolet (UV) transits. Various models of the dust clouds and gaseous rings have been proposed as an explanation for this behavior.
Aim…
Convective storms in closed cyclones in Jupiter's South Temperate Belt: (I) observations
Wong, Michael H.; Baines, Kevin H.; Hueso, Ricardo +19 more
On May 31, 2020 a short-lived convective storm appeared in one of the small cyclones of Jupiter's South Temperate Belt (STB) at planetographic latitude 30.8°S. The outbreak was captured by amateur astronomer Clyde Foster in methane-band images, became widely known as Clyde's Spot, and was imaged at very high resolution by the Junocam instrument on…
Nano-grain depletion in photon-dominated regions
Abergel, A.; Ysard, N.; Habart, E. +3 more
Context. Carbonaceous nano-grains play a fundamental role in the physico-chemistry of the interstellar medium (ISM) and especially of photon-dominated regions (PDRs). Their properties vary with the local physical conditions and affect the local chemistry and dynamics.
Aims: We aim to highlight the evolution of carbonaceous nano-grains in thre…
TOI-712: A System of Adolescent Mini-Neptunes Extending to the Habitable Zone
Vanderburg, Andrew; Hellier, Coel; Triaud, Amaury H. M. J. +41 more
As an all-sky survey, NASA's Transiting Exoplanet Survey Satellite (TESS) mission is able to detect the brightest and rarest types of transiting planetary systems, including young planets that enable study of the evolutionary processes that occur within the first billion years. Here we report the discovery of a young, multiplanet system orbiting t…
Photometric calibration methods for wide-field photometric surveys
Huang, Bowen; Yuan, Haibo; Xiao, Kai
Uniform and accurate photometric calibration plays an important role in the current and next-generation wide-field imaging surveys. Herein, we review the modern photometric calibration methods, including the classic standard star method, "hardware/observation-driven" methods (such as the Ubercalibration, Hypercalibration, and Forward Global Calibr…
J-PLUS: Detecting and studying extragalactic globular clusters. The case of NGC 1023
Cortesi, Arianna; Chies-Santos, Ana L.; Forbes, Duncan A. +19 more
Context. Extragalactic globular clusters (GCs) are key objects in studies of galactic histories. The advent of wide-field surveys, such as the Javalambre Photometric Local Universe Survey (J-PLUS), offers new possibilities for the study of these systems.
Aims: We performed the first study of GCs in J-PLUS to recover information on the history…
Discovery of SiO Masers in the "Water Fountain" Source IRAS 16552-3050
Tafoya, D.; Gómez, J. F.; Uscanga, L. +7 more
In this paper, we report new detections of SiO v = 1 and v = 2 J = 1 → 0 masers in the "water fountain" source IRAS 16552-3050, which was observed with the Nobeyama 45 m telescope during 2021 March-April. Water fountains are evolved stars whose H2O maser spectra trace high-velocity outflows of >100 km s-1. This is the seco…
Characterization of ionospheric irregularities over the equatorial and low latitude Nigeria region
Simi, K. G.; Ogwala, Aghogho; Oyedokun, Oluwole John +5 more
Ionospheric irregularity poses severe challenges to the highly dynamic satellite communication, navigation and tracking operations that rely on transionospheric satellite services like the operation of the Global Navigation Satellite System (GNSS). Although numerous studies on the effect of geomagnetic storms on the inhibition or suppression of ir…