Search Publications
Magnetically controlled ionosphere of Mars: A model analysis with the vertical plasma drift effects
Haider, S. A.; Bougher, S. W.; Withers, P. +2 more
We use our 1-D chemical diffusive model to quantify the physical processes necessary to interpret the dayside ionospheric electron density profiles measured with the Mars Radio Science (MaRS) experiment onboard the Mars Express (MEX) and Radio Occultation Science Experiment (ROSE) onboard the Mars Atmosphere and Volatile Evolution (MAVEN) spacecra…
The variability of the topside ionospheres of Venus and Mars as seen by recent radio science observations
Fränz, Markus; Tellmann, Silvia; Pätzold, Martin +7 more
This study combines the observations of the Venus Express Venus Radio science experiment (VeRa), Mars Express Mars Radio Science experiment (MaRS), and MAVEN Radio Occultation Science Experiment (ROSE) at Venus and Mars with proxies for environmental parameters, insolation and solar wind characteristics to compare the effects of individual drivers…
Short-wave fadeout on mars: Radio absorption in the dayside martian ionosphere enhanced by solar flares
Lester, M.; Sánchez-Cano, B.; Harada, Y. +1 more
Solar flares can cause radio absorption in the D region of the Earth's ionosphere and consequently interrupt high-frequency radio communication systems, also known as short-wave fadeout or the Dellinger effect. We present an analogous radio absorption event observed at Mars during a solar flare. In this event, the Mars Express Mars Advanced Radar …
Astrometric observations of Phoebe from 2010 to 2019 based on Gaia DR3
Cheng, X.; Zhang, H. Y.; Yan, D. +2 more
A total of 914 positions of Phoebe were collected from 2010 to 2019 with three different telescopes, which were the 1.56 m telescope at the Sheshan station of Shanghai Astronomical Observatory, the 1.0 m telescope at the Kunming station of Yunnan Astronomical Observatory and the 2.4 m telescope at the Lijiang station of Yunnan Astronomical Observa…
Measurement of D/H and 13C/12C ratios in methane ice on Eris and Makemake: Evidence for internal activity
Lunine, J. I.; Emery, J. P.; Hammel, H. B. +13 more
James Webb Space Telescope's NIRSpec infrared imaging spectrometer observed the outer solar system dwarf planets Eris and Makemake in reflected sunlight at wavelengths spanning 1 through 5 µm. Both objects have high albedo surfaces that are rich in methane ice, with a texture that permits long optical path lengths through the ice for solar p…
A flexible deep learning crater detection scheme using Segment Anything Model (SAM)
Giannakis, Iraklis; Bhardwaj, Anshuman; Sam, Lydia +1 more
Craters are one of the most important morphological features in planetary exploration. To that extent, detecting, mapping and counting craters is a mainstream process in planetary science, done primarily manually, which is a very laborious, time-consuming and inconsistent process. Recently, machine learning (ML) and computer vision have been succe…
A tale of 3 dwarf planets: Ices and organics on Sedna, Gonggong, and Quaoar from JWST spectroscopy
Lunine, J. I.; Emery, J. P.; Protopapa, S. +10 more
The dwarf planets Sedna, Gonggong, and Quaoar are interesting in being somewhat smaller than the methane-rich bodies of the Kuiper Belt (Pluto, Eris, Makemake), yet large enough to be spherical and to have possibly undergone interior melting and differentiation. They also reside on very different orbits, making them an ideal suite of bodies for un…
NEOMOD 2: An updated model of Near-Earth Objects from a decade of Catalina Sky Survey observations
Granvik, Mikael; Chodas, Paul W.; Nesvorný, David +9 more
Catalina Sky Survey (CSS) is a major survey of Near-Earth Objects (NEOs). In a recent work, we used CSS observations from 2005-2012 to develop a new population model of NEOs (NEOMOD). CSS's G96 telescope was upgraded in 2016 and detected over 10,000 unique NEOs since then. Here we characterize the NEO detection efficiency of G96 and use G96's NEO …
The Uranus system from occultation observations (1977-2006): Rings, pole direction, gravity field, and masses of Cressida, Cordelia, and Ophelia
Nicholson, Philip D.; French, Richard G.; Hedman, Matthew M. +2 more
From an analysis of 31 Earth-based stellar occultations and three Voyager 2 occultations spanning 1977-2006 (French et al. 2023a), we determine the keplerian orbital elements of the centerlines of the nine main Uranian rings to high accuracy, with typical RMS residuals of 0.2-0.4 km and 1- σ formal errors in a , ae , and a sin i of order 0.1 km, r…
Evidence of rapid hydrogen chloride uptake on water ice in the atmosphere of Mars
Montmessin, Franck; Fedorova, Anna A.; Trokhimovskiy, Alexander +5 more
In 2020, hydrogen chloride (HCl) in the gas phase was discovered in the atmosphere of Mars with the Atmospheric Chemistry Suite (ACS) onboard the Trace Gas Orbiter (TGO) mission (Korablev et al., 2021). Its volume mixing ratio (VMR) shows a seasonal increase of up to 5 ppbv during the perihelion season, followed by a sudden drop to undetectable le…