Search Publications
CCD Measurements of Double Stars at ASV and NAO Rozhen in 2019 and 2020
Cvetković, Zorica; Pavlović, Rade; Boeva, Svetlana
We continued our series of CCD observations of double and multiple stars during 2019 and 2020. A total of 331 pairs were observed at two stations, Serbian Astronomical Station on the mountain of Vidojevica (ASV) and Bulgarian National Astronomical Observatory at Rozhen (NAOR). They were performed using two telescopes, 1.4 m at ASV, and 2 m at NAOR…
Modeling solar illuminance during solar eclipses using solar image data
Muhamad, Johan
During a solar eclipse, the solar illuminance varies with time depending on the phase of the eclipse. Measuring the solar illuminance during a solar eclipse has been one of the most common projects conducted by students as well as amateur astronomers owing to the simplicity of its measurement. Despite extensive measurements conducted during previo…
Geological context of recent Lunar landing sites using Multispectral analysis.
Foing, Bernard; Mcilquham, Jourdain; Borst, Anouk M. +1 more
Geological context of recent lunar landing sites using multispectral analysis. (Mcilquham J, Borst A, Allender E and Foing B)The Moon Mineralogy Mapper (M3) was a guest instrument aboard the Chandrayaan-1 mission. The instrument collected spectral data, ranging from 430 nm to 3000 nm at an average resolution of 140 m/pixel. This research utilises …
Prediction of amphipathic helix—Membrane interactions with Rosetta
Meiler, Jens; Gulsevin, Alican
Planetary topography measurement by descent stereophotogrammetry
Jones, G. H.; Brydon, G.; Persaud, D. M.
Digital Terrain Models (DTMs) provide valuable insights into the nature of solar system surfaces, facilitating geological analysis, landing site selection and characterisation, and contextualising in situ measurements. For missions to solar system bodies for which orbiters and soft landed platforms are technologically or financially challenging to…
Spectral classification and MGM-based mineralogical characterization of hydrated phases: The Nili Fossae case, Mars
Altieri, Francesca; Carli, Cristian; Serventi, Giovanna +2 more
Mars has a relatively tenuous atmosphere, the remote-sensed spectral data of the surface are affected by the presence of the atmosphere. In particular the water and CO2 absorption of the atmosphere are in the same spectral region as water, OH- and (CO3)2- in minerals. An accurate correction of the gaseou…
A comparison of the simulations and observations for a nearby spiral arm
Paunzen, Ernst; Piecka, Martin
We present a review of our current understanding of the spiral structure of galaxies, based on the kinematic models.
The analysis is focused on the ability of galactic open clusters to trace the spiral arms, based on the recent data releases from Gaia. For this, a simple 1D description of the motion of spiral arms and clusters is introduced. …Unveiled density wave in Saturn's rings
French, Richard G.; McGhee-French, Colleen A.; Rappaport, Nicole J. +1 more
We unveil a two-dimensional visualization of the Mimas 5:3 density wave in Saturn's rings, created directly from 31 radial optical depth profiles of the rings obtained between 2005 and 2008 from Cassini Radio Science Subsystem (RSS) occultation observations, assuming only its predicted pattern speed and taking advantage of its evident four-armed s…
Evidence of Regionally Distributed Tectono-Volcanism in a Floor Fractured Crater of North-Central Arabia Terra, Mars
Komatsu, G.; Rani, A.; Basu Sarbadhikari, A. +3 more
Arabia Terra features many tectonic structures, which have been correlated to episodes of incipient tectonics, massive impacts, and controls on fluvial systems. However, the extent of regionally distributed tectono-volcanism and its effects on local structures remains unknown. To characterize the prevalence of volcanically driven processes in this…
The peculiar nebula Simeis 57. II. Distance, nature and excitation
Gull, T. R.; Brown, A. G. A.; Bally, J. +5 more
Simeis 57 (HS 191) is an optically bright nebula in the Cygnus X region with a peculiar appearance that suggests an outflow from a rotating source. Newly obtained observations and archival data reveal Simeis 57 as a low-density (ne ~ 100 cm−3) nebula with an east-to-west excitation gradient. The extinction of the nebula is A<…