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Mapping of Compositional Diversity and Chronological Ages of Lunar Farside Multiring Mare Moscoviense Basin: Implications to the Middle Imbrian Mare Basalts
Sharma, Manish; Karthi, A.; Arivazhagan, S.
The Mare Moscoviense is an astonishing rare flatland multi-ring basin and one of the recognizable mare regions on the Moon's farside. The mineralogical, chronological, topographical and morphological studies of the maria surface of the Moon provide a primary understanding of the origin and evolution of the mare provinces. In this study, the Chandr…
An ALMA 1.3 millimeter Search for Debris Disks around Solar-type Stars in the Pleiades
MacGregor, Meredith A.; Wilner, David J.; Matthews, Brenda +4 more
Millimeter emission from debris disks around stars of different ages provides constraints on the collisional evolution of planetesimals. We present ALMA 1.3 millimeter observations of a sample of 76 Solar-type stars in the ~115 Myr old Pleiades star cluster. These ALMA observations complement previous infrared observations of this sample by provid…
H I in and behind the Hubble Frontier Field clusters: a deep MeerKAT pilot search out to z ∼ 0.5
Obreschkow, Danail; Heywood, Ian; Deane, Roger +2 more
The Hubble Frontier Fields (HFF) are a selection of well-studied galaxy clusters used to probe dense environments and distant gravitationally lensed galaxies. We explore the 21cm neutral hydrogen (H I) content of galaxies in three of the HFF clusters, Abell 2744 (z = 0.308), Abell S1063 (z = 0.346), and Abell 370 (z = 0.375), to investigate the ev…
The Solar Neighborhood L: Spectroscopic Discovery of K Dwarfs Younger Than 1 Gyr and New Binaries within 30 pc
Henry, Todd J.; Paredes, Leonardo A.; Hubbard-James, Hodari-Sadiki +2 more
As part of a comprehensive effort to characterize the nearest stars, the CHIRON echelle spectrograph on the CTIO/SMARTS 1.5 m telescope is being used to acquire high-resolution (R = 80,000) spectra of K dwarfs within 50 pc. This paper provides spectral details about 35 K dwarfs from five benchmark sets with estimated ages spanning 20 Myr-5.7 Gyr. …
Observational data and orbits of the comets discovered at the Vilnius Observatory in 1980-2006 and the case of the comet 322P
Włodarczyk, Ireneusz; Černis, Kazimieras
This article is devoted to the discovery of comets at the Vilnius Observatory together with the orbital analysis of dynamically interesting comets, namely 322P. We studied the orbital evolution of comet 322P with and without non-gravitational effects. It turned out that many of the comet's orbital clones go into and out of retrograde orbits, somet…
Absolute magnitudes of white dwarfs and discovery of new white dwarfs from FBS Blue Stellar Objects by means of Gaia EDR3 data
Malkov, Oleg Yu.; Mickaelian, Areg M.; Mikayelyan, Gor A. +2 more
This article is a presentation of a project which is a statistical study of white dwarfs' properties carried out based on the sample of the First Byurakan Survey Blue Stellar Objects (FBS BSOs) and the Catalogue of White Dwarfs. Using these results, we have searched and will continue to search for new white dwarfs by means of Gaia accurate astrome…
Physical Characterization of 2015 JD1: A Possibly Inhomogeneous Near-Earth Asteroid
Granvik, Mikael; Gustafsson, Annika; Chandler, Colin Orion +7 more
The surfaces of airless bodies such as asteroids are exposed to many phenomena that can alter their physical properties. Bennu, the target of the OSIRIS-REx mission, has demonstrated how complex the surface of a small body can be. In 2019 November, the potentially hazardous asteroid 2015 JD1 experienced a close approach of 0.033 1 au fr…
Solar Coronal Mass Ejections Plasma Diagnostics Expressed as Potential Stellar CME Signatures
Raymond, John C.; Wilson, Maurice L.
Solar coronal mass ejections (CMEs) have a strong association with solar flares that is not fully understood. This characteristic of our Sun's magnetic activity may also occur on other stars, but the lack of successfully detected stellar CMEs makes it difficult to perform statistical studies that might show a similar association between CMEs and f…
Discovery of a Compact X-Ray Object with a 614 s Periodicity in the Direction of the Galactic Center
Gong, Hang
We report on analysis of X-ray, optical, and radio observations of the previously overlooked X-ray source 2CXO J174517.0-321356 located just 3.°2 away from the Galactic center. Timing analysis of X-ray observations of the source with XMM-Newton reveals periodic pulsations with periods of 1228 and 614 s, with the latter being tentatively considered…
ESAs Kometen-Mission Rosetta - Neu-Analyse der Daten des COSAC Massenspektrometers
Krüger, Harald; Gautier, Thomas; Szopa, Cyril +12 more
Es wird davon ausgegangen, dass das älteste weitgehend unveränderte Material aus der Frühphase des Sonnensystems in Form von Eis und Staub in Kometen vorliegt. Die ESA-Mission Rosetta trug daher mit Philae eine Landeeinheit, die die Zusammensetzung des Nukleus von Komet 67P/Churyumov-Gerassimenko in situ untersuchen sollte. Fünfundzwanzig Minuten …