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Hybrid method for crater detection based on topography reconstruction from optical images and the new LU78287GT catalogue of Lunar impact craters
Lončarić, Sven; Wöhler, Christian; Salamunićcar, Goran +1 more
Impact craters are ubiquitous and well-studied structures of high geological relevance on the surfaces of the Earth's Moon, the terrestrial planets, the asteroids and the satellites of the outer planets. Therefore, it is not surprising that crater detection algorithms (CDAs) are one of the most studied subjects of image processing and analysis in …
Integrated method for crater detection from topography and optical images and the new PH9224GT catalogue of Phobos impact craters
Lončarić, Sven; Salamunićcar, Goran; Pina, Pedro +2 more
In a large majority of lunar and planetary surface images, impact craters are the most abundant geological features. Therefore, it is not surprising that crater detection algorithms (CDAs) are one of the most studied subjects of image processing and analysis in lunar and planetary science. In this work we are proposing an Integrated CDA, consistin…
Solar X-ray Monitor (XSM) on-board Chandrayaan-2 orbiter
Shanmugam, M.; Vadawale, S. V.; Acharya, Y. B. +6 more
The remote X-ray fluorescence spectroscopy is a powerful technique to investigate the elemental abundances in the atmosphere-less planetary bodies. The experiment involves measuring spectra of fluorescent X-rays from lunar surface using a low energy X-ray detector onboard an orbiting satellite. Since the flux of fluorescent X-ray lines critically …
The role of ultraviolet imaging in studies of resolved and unresolved young stellar populations. M31 and M33
Bianchi, Luciana; Hodge, Paul; Williams, Benjamin +2 more
We discuss the relevance of UV data in the detection and characterization of hot massive stars and young stellar populations in galaxies. We show results from recent extensive surveys in M31 and M33 with Hubble Space Telescope (HST) multi-wavelength data including UV filters, which imaged several regions at a linear resolution (projected) of less …
Crater detection via genetic search methods to reduce image features
Cohen, Joseph Paul; Ding, Wei
Recent approaches to crater detection have been inspired by face detection's use of gray-scale texture features. Using gray-scale texture features for supervised machine learning crater detection algorithms provides better classification of craters in planetary images than previous methods. When using Haar features it is typical to generate thousa…
MIDACO software performance on interplanetary trajectory benchmarks
Schlueter, Martin
A numerical study of the MIDACO optimization software on the well known GTOP benchmark set, published by the European Space Agency (ESA), is presented. The GTOP database provides trajectory models of real-world interplanetary space missions such as Cassini, Messenger or Rosetta. The trajectory models are formulated as constrained nonlinear optimiz…
PlanetServer: Innovative approaches for the online analysis of hyperspectral satellite data from Mars
Rossi, A. P.; Flahaut, J.; Oosthoek, J. H. P. +4 more
PlanetServer is a WebGIS system, currently under development, enabling the online analysis of Compact Reconnaissance Imaging Spectrometer (CRISM) hyperspectral data from Mars. It is part of the EarthServer project which builds infrastructure for online access and analysis of huge Earth Science datasets. Core functionality consists of the rasdaman …
The effective temperatures of O-type stars from UV spectroscopy
Bianchi, Luciana; Garcia, Miriam
We present an analysis of high resolution spectra in the far-UV - UV range (∼905-2000 Å) with non-LTE, spherical, hydrodynamical, line-blanketed models, of three O-type Galactic stars, and derive their photospheric and wind parameters. These data extend previously analyzed samples and fill a gap in spectral type coverage. The combined sample confi…
Hard X-ray continuum from lunar surface: Results from High Energy X-ray spectrometer (HEX) onboard Chandrayaan-1
Banerjee, D.; Sreekumar, P.; Sudhakar, M. +10 more
The High Energy X-ray spectrometer (HEX) on Chandrayaan-1 was designed to study the photon emission in the range of 30-270 keV from naturally occurring radioactive decay of 238U and 232Th series nuclides from the lunar surface. The primary objective of HEX was to study the transport of volatiles on the lunar surface using rad…
Testing the asymmetric cone model for halo CMEs using STEREO/SECCHI coronagraphic observations
Michalek, Grzegorz; Nicewicz, Janusz
Space weather is significantly controlled by halo coronal mass ejections (HCMEs) originating close to the central meridian and directing toward the Earth. Unfortunately, coronagraphic observations (especially for HCMEs) are subject to a projection effect which makes it impossible to determine the true radial velocity and width of CMEs. However, th…