Search Publications
Temporal variation of the 3-micron hydrocarbon emissions at the 8-micron north polar hot spot of Jupiter: Comparison with solar wind activity
Kim, Sang Joon; Yung, Yuk L.; Miller, Steve +5 more
We have obtained Gemini/GNIRS 3.3-3.4 µm spectra of Jupiter at 65o North latitude over a range of longitudes roughly centered on the 8-µm CH4 north polar hot spot (8CNPHS). The spectra were measured on four occasions during a four-month period in 2018, in order to search for variability of the 3-µm emissions…
Seasonal thermal inertia variations at Gale crater: Role of active surface deposition phenomena
Rangarajan, Vidhya Ganesh; Ghosh, Mili
Thermal inertia has been found to play a significant role in planetary remote sensing applications, forming the basis of potentially all major lithological discriminations of the planetary surface. It has always been visualised to serve as a distinctive thermal property of the surface with its values remaining fairly constant at least for a short …
Geological characterization of Chandrayaan-2 landing site in the southern high latitudes of the Moon
Harish; Bhatt, Megha; Bhardwaj, Anil +7 more
ISRO's lunar orbiter-lander-rover mission Chandryaan-2 is scheduled to be launched in the mid of 2019. In this contribution, we have carried out detailed geological characterization of the prime landing site (70.9°S, 22.8°E) of the Chandrayaan-2 lander - "Vikram". The proposed landing site is located amidst the nearside lunar highlands at high sou…
Multistage ice-damming of volcanic flows and fluvial systems in Northeast Syrtis Major
Mustard, J. F.; Skok, J. R.; Matherne, Connor +2 more
The northeast edge of the Syrtis Major volcanic complex records a diverse history of volcanism and climate of early Mars which has long been argued to be dominated by icy or wet conditions. This region contains a stratigraphic record that spans the period of phyllosilicate secondary mineralogy from moderate pH alteration of the Early Noachian crus…
Dayside-to-nightside dust coma brightness asymmetry and its implications for nightside activity at Comet 67P/Churyumov-Gerasimenko
Thomas, N.; Marschall, R.; Wu, J. -S. +2 more
We have determined the dust coma brightness ratio between the dayside and the nightside (DS:NS) in OSIRIS images of comet 67P/Churyumov-Gerasimenko and compared them to results from numerical dust coma simulations to learn more about the dynamic processes that are involved in coma formation. The primary focus of this paper lies in the analysis of …
Plasma distribution around Comet 67P in the last month of the Rosetta mission
Szego, K.; Henri, P.; Nemeth, Z. +3 more
After accompanying comet 67P/Churyumov-Gerasimenko on its journey around the Sun and observing the evolution of its induced magnetosphere throughout the comet's life-cycle, the Rosetta operations concluded at the end of September 2016 with a controlled impact on the cometary nucleus. At that time, the comet was located more than 3.7 AU from the Su…
Identifying primitive noble gas components in lunar ferroan anorthosites
Gilmour, J. D.; Joy, K. H.; Pernet-Fisher, J. F.
Lunar ferroan anorthosites are the ideal samples for investigating primitive volatile systematics. Not only are these lithologies thought to be direct crystallization products of the Lunar Magma Ocean (LMO), but many samples display short (T38 < 5 Myr) cosmic ray exposure (CRE) ages, minimizing the effects of cosmic ray spallation re…
Re-reduction of CCD observations of Triton in 1996-2006 with Gaia DR2 and comparison with ephemerides
Cheng, X.; Yan, D.; Qiao, R. C. +1 more
The release of new high-precision and high-density catalogue Gaia DR2 brings new opportunities and challenges to high-precision astrometry. The early CCD images of planet satellites can be re-processed so as to give positions that are much more accurate than those initially obtained. Based on Gaia DR2 catalogue, the early CCD images of Triton take…
The ionosphere of Venus: Strongest control by photo-chemical-equilibrium in the solar system, with implications for exospheric temperatures
Pätzold, M.; Häusler, B.; Tellmann, S. +5 more
Profiles of electron density versus height obtained by the radio occultation experiment on Venus Express provide an observational data base suitable for semi-empirical modeling. The basic equations of photo-chemical-equilibrium (PCE) theory can be applied to the altitude range 100-170 km of Venus' ionosphere (Peter et al., 2014). Within that domai…
New astrometric positions of the Jovian irregular satellites Elara and Pasiphae in 2016-2018
Cheng, X.; Zhang, H. Y.; Yan, D. +5 more
A total of 372 astrometric positions of Jovian irregular satellites Elara and Pasiphae were obtained during three successive oppositions in 2016, 2017, and 2018, by 1 m telescope at Yunnan Observatory. Based on Gaia DR2 catalogue, 196 new positions of Elara and 176 new positions of Pasiphae were collected. We compared our observations to the theor…