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A mid-infrared study of synthetic glass and crystal mixtures analog to the geochemical terranes on mercury
Helbert, Joern; Hiesinger, Harald; Weber, Iris +8 more
The MERTIS (MErcury Radiometer and Thermal Infrared Spectrometer) onboard of the BepiColombo ESA/JAXA mission to Mercury will map the surface of Mercury in the wavelength range of 7-14 µm and for the interpretation of these spectra a database of analog materials is needed. We analyzed bulk grain size fractions of a series of analog materials…
Analysis of Charon's spectrum at 2.21- µm from New Horizons/LEISA and Earth-based observations
Singer, Kelsi N.; Stern, S. Alan; Weaver, Harold A. +9 more
We examine the 2.21- µm band from 19 disk-integrated Charon spectra measured by New Horizons/LEISA in the week leading up to its closest encounter with the Pluto system. These observations cover one Charon rotation period. Additionally, we analyze Charon's 2.21- µm band from 22 Earth-based spectra obtained over the last two decades. We…
Mid-IR spectral properties of different surfaces of silicate mixtures before and after excimer laser irradiation
Hiesinger, Harald; Helbert, Jörn; Weber, Iris +6 more
The behaviour of the Christiansen feature (CF) and the Reststrahlen bands (RBs) in mid-infrared (IR) reflectance spectra on various silicate mixtures as pressed pellets and powders was investigated in high-vacuum. In addition, the influence of micrometeorite bombardment simulated with an excimer laser was studied. The mixtures cover a wide range o…
Uranus ring occultation observations: 1977-2006
Nicholson, Philip D.; French, Richard G.; Sicardy, Bruno +25 more
The Uranian rings were discovered serendipitously on 10 March 1977 during a stellar occultation (Elliot et al., 1977a; Millis et al., 1977), and a rich set of subsequent Earth-based occultations revealed that these narrow and sharp-edged rings were eccentric and inclined, precessing under the gravitational influence of the oblate central planet. C…
Near-IR photometry of the small Uranian satellites with Keck at phase angles 0-2°
de Pater, Imke; Moeckel, Chris; Paradis, Samuel
We present photometric measurements of the seven brightest small inner moons of Uranus (Puck, Belinda, Rosalind, Portia, Juliet, Desdemona and Cressida) obtained with the Keck II telescope at 1.6 and 2 . 2 µm at phase angles of 0.026∘ and 0.36∘ in October-November 2019. We also applied our new calibration technique to the August 2015 data at…
The effects of atmospheric dust and solar radiation on the dayside ionosphere of Mars derived from 17 years of Mars Express radio science observations
Pätzold, M.; González-Galindo, F.; Witasse, O. +5 more
This work combines 17 years of Mars Express radio science (MaRS) observations with proxies for insolation and local/global atmospheric dust to investigate the combined and individual effects on the dayside ionosphere of Mars from the top down to the ionospheric base.
The increase in insolation from orbital apocenter to pericenter in combinati…Spins and shapes of basaltic asteroids and the missing mantle problem
Hasegawa, Sunao; Oszkiewicz, Dagmara; Skiff, Brian A. +31 more
Basaltic V-type asteroids are common in the inner part of the Main Asteroid Belt and much less abundant in the mid and outer parts. They are of scientific interest because they sample crusts and mantles of theoretically plentiful differentiated planetesimals that existed in the Solar System four billion years ago. Some Solar System theories sugges…
Morphology and paleohydrology of intracrater alluvial fans north of Hellas Basin, Mars
Williams, Rebecca M. E.; Anderson, Ryan B.; Gullikson, Amber L. +1 more
Alluvial fans and sinuous ridges are both important records of the history of fluvial activity on Mars, and they often occur together. We present observations of alluvial fans, many of which exhibit inverted relief, in five craters in the region north of Hellas basin. The observed fans ranged in size from ~10 to 820 km2. We identified t…
Investigating temporal changes in Jupiter's aerosol structure with rotationally-averaged 2015-2020 HST WFC3 images
Sromovsky, Lawrence A.; Fry, Patrick M.
Annual imaging observations of Jupiter from 2015 onward by the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) as part of the Outer Planet Atmospheres Legacy (OPAL) program (Simon et al., 2015) have provided a valuable data set from which Jupiter's temporal variability can be characterized and modeled. Spectral samples at discrete filter b…
The SOIR/Venus Express species concentration and temperature database: CO2, CO, H2O, HDO, H35Cl, H37Cl, HF individual and mean profiles
Vandaele, A. C.; Trompet, L.; Robert, S. +2 more
This work is an update of the SOIR mean and individual profiles of CO2, CO, H2O, HDO, H35Cl, H37Cl, HF, and the temperature measured at the Venus terminator during the Venus Express mission (2006-2014).
The previous versions of the database were published by Chamberlain et al. (2020); Mahieux et al.…