Results 41 to 50 of about 2,118 (196)

Saponite Bearing Material Excavated During the Formation of a Recent 25‐m‐Diameter Impact Crater in Southeastern Arabia Terra on Mars

Journal of Geophysical Research: Planets, Volume 131, Issue 5, May 2026.
Abstract Mars Reconnaissance Orbiter's Compact Reconnaissance Imaging Spectrometer for Mars (CRISM), Context Imager (CTX), and High Resolution Imaging Science Experiment observations were analyzed for a 25‐m‐wide impact crater and associated ejecta deposits located in the dust‐covered Arabia Terra region.
R. E. Arvidson, J. G. Catalano, J. R. Christian, A. A. Fraeman, M. N. Hughes, A. L. Knight, W. B. McKinnon, R. V. Morris, S. L. Murchie, J. A. O’Sullivan, D. V. Politte, F. Seelos, M. J. Wolff, F. Zhou   +13 more
wiley   +1 more source

Surface environment of Phobos and Phobos simulant UTPS

Earth, Planets and Space, 2021
The Martian Moons eXploration (MMX) mission will study the Martian moons Phobos and Deimos, Mars, and their environments. The mission scenario includes both landing on the surface of Phobos to collect samples and deploying a small rover for in situ ...
Hideaki Miyamoto, Takafumi Niihara, Koji Wada, Kazunori Ogawa, Hiroki Senshu, Patrick Michel, Hiroshi Kikuchi, Ryodo Hemmi, Tomoki Nakamura, Akiko M. Nakamura, Naoyuki Hirata, Sho Sasaki, Erik Asphaug, Daniel T. Britt, Paul A. Abell, Ronald-Louis Ballouz, Olivier S. Banouin, Nicola Baresi, Maria A. Barucci, Jens Biele, Matthias Grott, Hideitsu Hino, Peng K. Hong, Takane Imada, Shingo Kameda, Makito Kobayashi, Guy Libourel, Katsuro Mogi, Naomi Murdoch, Yuki Nishio, Shogo Okamoto, Yuichiro Ota, Masatsugu Otsuki, Katharina A. Otto, Naoya Sakatani, Yuta Shimizu, Tomohiro Takemura, Naoki Terada, Masafumi Tsukamoto, Tomohiro Usui, Konrad Willner   +40 more
doaj   +1 more source

The Sesquinary Catastrophe on Deimos Can Reconcile Its Excited Past with Its Dynamically Cool Present

The Planetary Science Journal
The origins of the Martian moons Phobos and Deimos are highly debated, and hypotheses include formation from an impact-generated circum-Martian disk and formation from capture of asteroids.
Kaustub P. Anand, Matija Ćuk, David A. Minton   +2 more
doaj   +1 more source

End-to-End GNC Solution for Reusable Launch Vehicles

Aerospace
This paper presents an autonomous end-to-end guidance, navigation, and control (GNC) solution for a reusable launcher, addressing the challenges of precision pinpoint landing and reusability. The proposed GNC system integrates advanced onboard trajectory
Jacopo Guadagnini, Pietro Ghignoni, Fabio Spada, Gabriele De Zaiacomo, Afonso Botelho   +4 more
doaj   +1 more source

Assessment of Ionospheric Model Performance Over the US During the Extreme G5 2024 Mother's Day Geomagnetic Storm

Space Weather, Volume 24, Issue 5, May 2026.
Abstract This study evaluates 17 ionospheric models' performance over the Continental United States (CONUS) during the 2024 Mother's Day geomagnetic storm, using ground‐based GNSS Total Electron Content (TEC) and single‐frequency (SF) precise Single Point Positioning (SPP) technique. The storm produced significant positive storm effects during its main
Min‐Yang Chou, Jia Yue, Deimos Ibáñez Segura, J. D. Huba, Tzu‐Wei Fang, Charles Lin, Chi‐Yen Lin, Aaron Bukowski, Aaron Ridley, Ivan Galkin, Dieter Bilitza, Jack Wang, Mohammed Mainul Hoque, Maksym Petrenko, Paul Dimarzio, Maria M. Kuznetsova   +15 more
wiley   +1 more source

Modelling and Simulation of the Space Rider Re-Entry and TAEM Phases [PDF]

INCAS Bulletin
The design and Verification &Validation (V&V) of Guidance, Navigation, and Control (GNC) algorithms for reusable re-entry space vehicles represent one of the most challenging aspects of modern aerospace engineering.
Gabriel GRAUR, Andrei-Filip COJOCARU, Andrei-Alexandru LAPUSNEANU, Alina-Georgia IONITA, Traian-Andrei ANTOHI, Florin TACHE, João P. BELFO, José VASCONCELOS, Vicente FERNANDEZ, Alfredo AGENJO, Salvador LLORENTE, Marjorie VALLEJO, Alberto IBERNÓN   +12 more
doaj   +1 more source

Entropy Approximation by Machine Learning Regression: Application for Irregularity Evaluation of Images in Remote Sensing

Remote Sensing, 2022
Approximation of entropies of various types using machine learning (ML) regression methods are shown for the first time. The ML models presented in this study define the complexity of the short time series by approximating dissimilar entropy techniques ...
Andrei Velichko, Maksim Belyaev, Matthias P. Wagner, Alireza Taravat   +3 more
doaj   +1 more source

The Gravitational Field of Deimos

Icarus, 1995
Abstract Deimos may be largely uniform in density. We find here the gravitational field of Deimos and its moments of inertia from the moon's shape and an assumed uniform density distribution. From these data we compute the expected orientation. The orientation of the model Deimos relative to Mars agrees with that observed to within the observation ...
David Parry Rubincam, Benjamin Fong Chao, Peter C. Thomas   +2 more
openaire   +1 more source

On the Distinguishability of HRF Models in fMRI

Frontiers in Computational Neuroscience, 2015
Modelling the Haemodynamic Response Function (HRF) is a critical step in fMRI studies of brain activity, and it is often desirable to estimate HRF parameters with physiological interpretability.
Paulo Nobre Rosa, Patricia eFigueiredo, Carlos Jorge Silvestre, Carlos Jorge Silvestre   +3 more
doaj   +1 more source

Small-scale topographic irregularities on Phobos: image and numerical analyses for MMX mission

Earth, Planets and Space, 2021
The mothership of the Martian Moons eXploration (MMX) will perform the first landing and sampling on the surface of Phobos. For the safe landing, the 2.1-m-wide mothership of the MMX should find a smooth surface with at most 40 cm topographic ...
Tomohiro Takemura, Hideaki Miyamoto, Ryodo Hemmi, Takafumi Niihara, Patrick Michel   +4 more
doaj   +1 more source