Planetary Science Directorate


Upcoming SwRI Boulder Colloquia

Colloquia are normally on Tuesdays at 11:00 am in the 4th-floor conference room, except as indicated below in bold text.
Show previous colloquia

For questions or suggestions for speakers, please contact the SwRI colloquium organizers:
Tim Bowling, tbowling(at)
Simon Porter, 303-226-0868 or porter(at), or
Julien Salmon, 720-208-7203 or julien(at)
Kelsi Singer, 303-226-5910 or ksinger(at)

To be added to the SwRI Boulder Colloquia email list, please contact Simon Porter at porter(at)

Mon Jan 22, 201811:00 am Katherine Shirley Stony Brook University Effects of Space Weathering on Mid-Infrared Emissivity
Abstract: Space weathering is an important aspect of regolith development on airless bodies within our solar system that changes optical properties of the regolith, and consequently, influences our analysis of remote sensing data. The visible and near-infrared has been well studied and shown that the reflectance spectra of space weathered material exhibit reduced overall albedo and band strength, and have spectrally red slopes; however, there have been far fewer studies on the effects of space weathering in the mid-infrared (MIR). One such effect, the reduction in overall albedo, is likely to vary the thermal properties of the regolith, which will affect MIR emission spectra. In the MIR, environmental conditions play an important role in the appearance of emissivity spectra, as the thermal gradients in the upper 100s of microns of regolith have been shown to cause shifts in spectral features from what we measure on Earth, meaning that we cannot use standard libraries collected under terrestrial conditions. Here, I examine the effects of synthetic space weathering on MIR spectral features measured within a simulated lunar environment, and compare to data from the lunar missions Diviner, Kaguya, and Clementine. The changes to key mineralogical indicators, such as the Christiansen feature, due to albedo variation show up in both the laboratory and remote sensing data sets, and will be important in future analyses of data from the Moon, as well as, from other airless bodies.
Tue Feb 6, 201811:00 am Tim McCoy Smithsonian Four Cores and 30 Years Ago
Thu Feb 8, 201811:00 am Jaehan Bae Department of Terrestrial Magnetism Carnegie Inst. Rings, gaps, and spiral arms in protoplanetary disks: how can we fit these observations into planet formation theories?
Tue Feb 20, 201811:00 am Everett Shock Arizona State University TBD Hydrothermal Systems
Tue Feb 27, 201811:00 am Jennifer Scully Jet Propulsion Laboratory The Formation and Evolution of Ceres’ Occator Crater
Tue May 1, 201811:00 am Slava Solomatov Washington University in St. Louis Magma Ocean Dynamics