Planetary scientists and geologists dedicated to understanding planetary surfaces and developing new instruments/techniques for mineral and chemistry analysis
Pasadena, CA
Joined January 2018
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Ehlmann Research Group, Caltech retweeted
Launch window for @LunarTrailblazr opens today! 🚀🌚 Immensely proud of our team and looking forward to getting underway to map water on the Moon. Launching along with IM-2/SpaceX, separating ~48min after launch. @NASA coverage starts 6:30pm ET #PI_daily
🚀🌙 @NASA’s Lunar Trailblazer mission is ready to live up to its name!
The small satellite is riding along on @Int_Machines’ IM-2 launch, part of NASA’s CLPS initiative, which is slated to launch no earlier than Feb. 26.
🧵Check out this thread to learn more about the mission!
ALT NASA’s Lunar Trailblazer approaches the Moon as it enters its science orbit in this artist’s concept. The small satellite will orbit about 60 miles (100 kilometers) above the lunar surface, producing the best-yet maps of water on the Moon. Credit: Lockheed Martin Space
Congratulations to Dr. Sergio Parra on a successful PhD defense!
(Advisors, and pictured below with Serg: @bethanyehlmann and @OrphanANME)
Ehlmann Research Group, Caltech retweeted
Congrats to @Caltech @EhlmannLab alum Dr. Ellen Leask on her important findings for Mars history: sulfates connected with basin volcanoes, large ash deposits, late history saline waters -- Terra Sirenum holds an amazing record of Mars climate! Check out the paper 👇
A 2Gyr History of Water-Alteration in Terra Sirenum, Mars: Volcanism's Influence on Al Clay Formation and Chemically Distinct Waters Forming Sulfates and Chlorides Into the Amazonian. buff.ly/4eBWXs7 Thick deposits with Al clays thin with distance from Arsia Mons.
Ehlmann Research Group, Caltech retweeted
Former @Caltech @EhlmannLab postdoc Lucia Mandon traces more oxidized minerals in part of the Jezero crater delta relative to the floor or later rocks seen by @NASAPersevere in the upper delta
Variable Iron Mineralogy and Redox Conditions Recorded in Ancient Rocks Measured by In Situ Visible/Near-Infrared Spectroscopy at Jezero Crater, Mars. buff.ly/4gAAOM7 Strata at the fan front saw stronger oxidative water‐ rock interactions vs the upper fan & crater floor.
Ehlmann Research Group, Caltech retweeted
New paper from @Caltech @EhlmannLab grad student Yu Yu Phua et al shows the hydration state of sulfates in Mars rocks seen by @NASAPersevere. More dehydrated than @MarsCuriosity rocks (weird), and phases found indicate salty fluids for at least some of the waters in Jezero crater
Characterizing Hydrated Sulfates and Altered Phases in Jezero Crater Fan and Floor Geologic Units With SHERLOC on Mars 2020. buff.ly/4em8JXi Hydrated Ca‐sulfates are found only in the upper fan.
Ehlmann Research Group, Caltech retweeted
This week, we have a plot demonstrating the spectral diversity of the rocks that the Perseverance rover has encountered in Jezero Crater. These spectra show variable iron mineralogy which indicates strong oxidative water-rock interactions in the Jezero delta deposits. (1/2)
ALT This figure is composed of two large panels. On the left, there are eight spectra of abraded surfaces of rocks seen on the crater floor and in the delta of Jezero Crater. On the right are images of fifteen of those abraded patches, with footprints showing where the spectral measurements were taken.
Tuesday morning poster, Samantha Baker: Clay mineralogy and stratigraphy in Nili Fossae suggest acidic alteration of transported sedimentary material rather than intensive leaching #10thMars
Wednesday morning poster, Oak Kanine: Paleoenvironmental analysis of Jezero Crater, Mars: stratigraphy and structure from rover instruments and orbital data #10thMars
How did @ErroneousTholus and colleagues get 86,000+ images aligned to make a seamless 5m/pix image of Mars? Find out! Paper here:
dx.doi.org/10.1029/2024EA003…
@bethanyehlmann @theAGU
And to get the mosaic, use the NASA PDS or go to the Murray Lab: murray-lab.caltech.edu/CTX/
New @EhlmannLab paper by @AndrewAnnex showing how lavas on Jezero crater's floor followed topography set by sediments formed under earlier episodes of Lake Jezero - important for interpreting rover data.
agupubs.onlinelibrary.wiley.…
Part of our group is headed to #LPSC2024 next week! Here's a thread of Ehlmann lab presentations. We hope to see many of you there!
.@bethanyehlmann (talk, Tuesday 4:40 pm, Waterway 4): As Mars Sample Return is reworked, it is important to keep the scientific return that led to its prioritization by the Decedal Survey intact #LPSC2024
Valeria Kachmar (poster, Tuesday): Spectral analyses of Ceres' surface water ice deposits help to constrain their emplacement processes #LPSC2024