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Large-Scale Disturbances of the Solar Wind According to Spacecraft Radio Transmission Data from the Mars Express and Local Measurements on the Wind Spacecraft
Efimov, A. I.; Smirnov, V. M.; Chashei, I. V. +1 more
The results of experiments on radio sounding of near the Sun plasma by the signals of the Mars Express Mars satellite are presented. In the region of heliocentric distances of the proximate point of the line of sight of 8–13 solar radii, frequency fluctuations of transmission radio signals were measured. During the experiments sharp increases in t…
Solar Orbiter fine pointing Mode improvement in flight: Challenges and achievements
Cantiello, Ilario; Chapman, Patrick; Monroig, Guillaume +2 more
ESA Solar Orbiter was launched from Cape Canaveral in collaboration with NASA on the February 10, 2020 to start its journey around the Sun, with the commissioning phase ending in April 2020. After commissioning, ESA set a tighter pointing requirement goal to further improve the performance in Fine Pointing Mode, in preparation of the upcoming star…
A simple linear model to aid in analyses of the β Pictoris moving group
Barbosa, Valmir C.; do Nascimento, Josina O.
We build a 4D linear model of object membership in the $\beta$ Pictoris moving group (BPMG), using two nested applications of Principal Component Analysis (PCA) for ~1.5 million objects with high-quality data. These data consist of 3D-Galactic space velocities and Gaia G magnitudes. Through PCA, they ultimately result in a 4D straight line, referr…
Estimation of the Flux at 1450 MHz of OB Stars for FAST and SKA
Jiang, Biwei; Deng, Dingshan; Zijlstra, Albert +2 more
Radio observation is crucial to understanding the wind mechanism of OB stars but very scarce. This work estimates the flux at 1450 MHz (S 1.4GHz) of about 5000 OB stars identified by the LAMOST spectroscopic survey and confirmed by the Gaia astrometric as well as astrophysical measurements. The calculation is performed under the free-fr…
OGLE-2019-BLG-1180Lb: Discovery of a Wide-orbit Jupiter-mass Planet around a Late-type Star
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +32 more
We report on the discovery and analysis of the planetary microlensing event OGLE-2019-BLG-1180 with a planet-to-star mass ratio q ~ 0.003. The event OGLE-2019-BLG-1180 has unambiguous cusp-passing and caustic-crossing anomalies, which were caused by a wide planetary caustic with s ≃ 2, where s is the star-planet separation in units of the angular …
Dendritic ridges in Antoniadi basin, Mars: Fluvial or volcanic landforms?
Mangold, N.; Thomas, N.; Hauber, E. +7 more
Antoniadi basin displays dark-toned dendritic ridges previously interpreted as inverted fluvial channels. Detailed observations of these dark-toned ridges as well as the geological units in the central region of Antoniadi basin are provided emphasizing images from the Colour and Stereo Surface Imaging System (CaSSIS), the High Resolution Stereo Ca…
New Insights into Aristarchus Crater with LRO LAMP Far-ultraviolet Observations
Hendrix, Amanda; Retherford, Kurt; Grava, Cesare +8 more
Aristarchus crater is a Copernican-age impact crater well known for its high-albedo ejecta blanket and nearby flow features rich in pyroclastic materials. The Lyman Alpha Mapping Project (LAMP) is a far-ultraviolet (FUV) spectrograph (57-197 nm) on board the Lunar Reconnaissance Orbiter (LRO). LAMP data identified Aristarchus crater as having a hi…
The Calar Alto CAFOS direct imaging first data release
Cortés-Contreras, M.; Solano, E.; Rodrigo, C. +3 more
We present the first release of the Calar Alto CAFOS direct imaging data, a project led by the Spanish Virtual Observatory with the goal of enhancing the use of the Calar Alto archive by the astrophysics community. Data Release 1 contains 23 903 reduced and astrometrically calibrated images taken from 2008 March to 2019 July with a median of the m…
Identifying the Variety of Jovian X-Ray Auroral Structures: Tying the Morphology of X-Ray Emissions to Associated Magnetospheric Dynamics
Jackman, C. M.; Kurth, W. S.; Branduardi-Raymont, G. +12 more
We define the spatial clustering of X-rays within Jupiter's northern auroral regions by classifying their distributions into "X-ray auroral structures." Using data from Chandra during Juno's main mission observations (24 May 2016 to 8 September 2019), we define five X-ray structures based on their ionospheric location and calculate the distributio…
Light curve analysis of main belt asteroids 4747, 5255, 11411, 15433, 17866
Eglitis, Ilgmars; Kristers, Nagainis
The main belt asteroids 4747, 5255, 11411, 15433, and 17866 were studied at the Baldone Astrophysical Observatory in the time span range 2018-2022. The obtained light curve data together with published Minor Planet Center data are analyzed with Fourier series, Lomb-Scargle periodogram, and phase dispersion minimization methods. A plan of analysis …