Category: 2. Space
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Spectral Energy Distributions for 258 Local Volume Galaxies
We present model spectral energy distribution (SED) fits to ultraviolet/optical/infrared observations for the 258 nearby galaxies in the Local Volume Legacy survey, a sample dominated by lower-luminosity dwarf irregular systems. The data for each galaxy include up to 26 spatially-integrated broadband and narrowband fluxes from the Galaxy Evolution Explorer, Spitzer Space Telescope, and Infrared Astronomical…
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The True Nature of the Brightest Local Triple Stellar Candidates within 100 pc in the Galaxy
We present a study of a sample of bright (V ≤ 10 mag) and close (d ≤ 100 pc) triple–stellar system candidates in the galaxy, consisting of eight systems in total. Our aim is to determine their actual multiplicity and the physical properties of each stellar component in the systems. The sample was analyzed using…
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Magnetic Effects and 3D Structure in Theoretical High-resolution Transmission Spectra of Ultrahot Jupiters: the Case of WASP-76b
High-resolution spectroscopy has allowed for unprecedented levels of atmospheric characterization, especially for the hottest gas-giant exoplanets known as ultrahot Jupiters (UHJs). High-resolution spectra are sensitive to 3D effects, making complex 3D atmospheric models important for interpreting data. Moreover, these planets are expected to host magnetic fields that will shape their resulting atmospheric circulation patterns, but…
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Comparative Study of TESS Photometry and Radial Velocities on Six Early K-type Contact Binaries with Similar Periods around 0.268 Day
According to the definition introduced by Binnendijk (1970), late-type (or W UMa–type) contact binaries (CBs) are classified into two classes: A type and W type. We use “subtype” instead of “type,” as some new literature has used (Li et al. 2020; Lu et al. 2020; Qian et al. 2020; Alton & Stepień 2021; Li et…
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Astronomers Find First Radiation Belt Outside Our Solar System – 10 Million Times Brighter Than Jupiter’s
Artist’s impression of an aurora and the surrounding radiation belt of the ultracool dwarf LSR J1835+3259. Credit: Chuck Carter, Melodie Kao, Heising-Simons Foundation High-resolution imaging of radio emissions from an ultracool dwarf shows a double-lobed structure like the radiation belts of Jupiter. A team of astronomers has successfully observed the first radiation belt outside our…
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Telesat orders prototype satellite to continue LEO broadband tests
TAMPA, Fla. — Telesat plans to launch another low Earth orbit (LEO) prototype satellite in the coming months to continue tests after an aging demonstrator for its delayed broadband constellation ran out of fuel. The Canadian geostationary satellite operator announced May 30 that it had ordered a microsatellite called LEO 3 from Space Flight Laboratory…
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Northrop Grumman’s deep-space radar passes critical design review
WASHINGTON — A deep-space radar developed by Northrop Grumman for the U.S. Space Force passed a critical design review, the company announced May 30. Northrop Grumman said it also completed a software demonstration of the Deep-Space Advanced Radar Capability program known as DARC. The company last year won a $341 million contract to develop a…
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Webb Space Telescope Maps Surprisingly Large Plume Jetting From Saturn’s Moon Enceladus
NASA/ESA/CSA’s James Webb Space Telescope’s exquisite sensitivity and highly specialised instruments are revealing details into how one of Saturn’s moon’s feeds the water supply for the entire system of the… Continue Reading News Source: astrobiology.com
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NASA Sets Coverage for Next SpaceX Resupply Launch to Space Station
NASA and SpaceX are targeting 12:35 p.m. EDT Saturday, June 3, to launch the company’s 28th commercial resupply services mission to the International Space Station from Launch Complex 39A at the agency’s Kennedy Space Center in Florida. Continue Reading News Source: www.nasa.gov
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Researchers propose a deep neural network-based 4-quadrant analog sun sensor calibration
by Beijing Institute of Technology Press Co. The calibration and testing platform of the sun sensor. Credit: Space: Science & Technology A spacecraft can estimate the attitude state by comparing external measurements from attitude sensors with reference information. CubeSats tend to use 4-quadrant analog solar sensors which have the advantages of extremely low power consumption,…