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Catherine Weitz Personal/Professional Page

I currently have three primary research interests: (1) sedimentary deposits on Mars; (2) soils and small rocks observed at various rover and stationary landing sites; and (3) pyroclastic deposits on the Moon. I am a member of the science teams on the MER, MSL, Insight, and MRO (HiRISE) missions. I live in Arlington, VA and work from my home office.

 

Sedimentary Deposits on Mars

Thick, laterally extensive sedimentary sequences deposited on Mars provide insight into the environmental conditions that prevailed when the sediments were emplaced, while hydrated minerals hold numerous clues to understanding the long history of aqueous activity on the planet. Recent and ongoing studies have placed important constraints on aqueous processes responsible for deposition of sediments in lacustrine systems or that have altered rocks by groundwater or surface flow. By identifying distinct mineral phases and determining how these minerals are associated spatially and temporally, it should be possible to decipher the changing nature of aqueous processes through time. In particular, Valles Marineris contains some of the largest exposures of sedimentary deposits and, consequently, may provide a critical piece of the puzzle to understanding the aqueous and sedimentary history of Mars.

My research uses multiple imagery data sets to map out the 3-dimensional distribution of sedimentary units and look at details that could provide information concerning their origin and relative ages. In particular, I utilize CRISM hyperspectral data and HiRISE high-resolution images of deposits on Mars in order to constrain their mineralogy and morphology, which in term provide insight into how these deposits formed. Right now, I have funding to study these deposits in Valles Marineris and Ladon Basin. 

 

Soils and small rocks at several martian landing sites

I have analyzed Microscopic Imager (MI) and Panoramic Camera (Pancam) images from the Opportunity rover at Meridiani Planum on Mars in order to make measurements of grain sizes and spectral properties for soil and small rock particles. The grain-size analyses of the soils at Meridiani Planum have been used to identify rock souces for the grains and provide information about depositional processes under past and current conditions. The Pancam spectral analyses have shown that there are several types of cobbles at the site, including meteorites.

I also analyze soils in camera images acquired by the Curiosity rover at Gale crater. I am particularly interested in the highest resolution images of sand grains taken by the MAHLI camera to understand eolian processes on Mars. I use the images to measure the sizes, shapes, and colors of sand grains on eolian bedforms, such as ripples and dunes. 

I am using camera images taken from the Insight lander to measure and characterize clasts around the landing site. The results were used to identify safe locations to deplot the geophysics instruments on the lander, as well as to provide new insight into clasts found on the martian surface.

 

Pyroclastic deposits on the Moon

Pyroclastic glasses on the Moon have been identified remotely from telescopic and orbital data sets, as well as in Apollo samples. They provide important clues concerning the lunar volcanic history of the Moon, especially the history of volatiles within the lunar interior. Important questions remain about their timing in relation to effusive mare basalts, their distribution relative to impact basins, and their importance in terms of potential resources for future manned missions to the Moon. Lunar dark mantle deposits (DMDs) were produced in explosive volcanic eruptions and are identified based upon their relatively low albedos, surface smoothness, mantling relationship to underlying terrain, and spectral absorption bands due to the presence of iron-bearing volcanic glasses. DMDs may be composed of glasses and/or crystallized beads, depending upon the optical density (concentration of gas and clasts for a given volume) of the plume and time within the plume.

I am currently analyzing high spatial and spectral resolution images taken at multiple illuminations to better refine the extent of DMDs, assess whether the medium and smaller size deposits are pyroclastic material or mare ponds, identify and characterize plausible source vents, explore the geologic setting of each deposit, and characterize the eruption that emplaced the deposit. A systematic study across all DMDs has the potential to reveal more about the processes that formed them and the implications of those processes for lunar volcanism and lunar volatiles than the study of one or a few DMDs. The attempt to either group or ungroup DMDs based on new data, and the related task of looking for candidate vents in proximity to the DMDs, could refine the number, type and distribution of DMDs. Additionally, these studies will contribute to lunar resource evaluation, a lunar volatile inventory, and potentially an eventual manned lunar base site selection. 

 

Publications

 

Useless Information About Me

I was a guest on the Daily Show with Jon Stewart. I was invited to his show to talk about the MER rover Spirit shortly after landing. Unfortunately, I was completely sober and nervous during the interview and had never watched his show before (of course, I now watched it religiously!!) so I came off as lame. If you are really bored and want to see my 7 minutes of fame, you can check out my interview here: http://thedailyshow.cc.com/videos/49kdjf/catherine-weitz

FYI, I was wearing 2 watches because one of them was on Earthtime and the other was on Marstime but Jon forgot to ask me about working on Marstime so I look like a weirdo wearing 2 watches.

 

I have two children who I love dearly but who can sometimes drive me nuts. If you have kids, you can probably relate. 

I like to paint watercolors and have done several space-related paintings, but most of the paintings were made before I had kids when I had soooo much free time. Now I am lucky if I can make a painting every 5 years.

I used to ride my bike a lot, but then I had kids....

I used to read a lot, but then I had kids....

I used to travel a lot, but then I had kids....

When my kids are out of the house and I am retired, I look forward to doing all these things again.

 

 

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