Rajani D. Dhingra

Stable Isotope Abundance Patterns as Potential Biosignatures

David J. Des Marais, Tristan A. Caro, Rajani D. Dhingra, Allison C. Fox et autres

The abundance and distribution of stable isotopes of an element in a substance can provide insights regarding the source, synthesis, and environmental history of that substance. Because isotopic discrimination during chemical reactions can be unique to specific chemical pathways or environmental conditions, …

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Investigating the Extent of Bladed Terrain on Pluto via Photometric Surface Roughness

Ishan Mishra, Rajani D. Dhingra, B. J. Buratti, Benoît Seignovert et autres

Abstract NASA's New Horizons spacecraft discovered fields of sub‐parallel sets of steep ridges situated in the high‐altitude, low‐latitude regions in Pluto's encounter hemisphere called “bladed terrain.” Thought to be formed due to sublimational erosion of methane ice, bladed terrain represents an active …

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Contributors

Caitlin Ahrens, C. J. Bierson, Stephen Brough, Frances Butcher et autres

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Titan, Enceladus, and other icy moons of Saturn

K. Farnsworth, Rajani D. Dhingra, Caitlin Ahrens, Erica Nathan et autres

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Large-scale cryovolcanic resurfacing on Pluto

K. N. Singer, Oliver Luke White, Bernard Schmitt, Erika L. Rader et autres

Abstract The New Horizons spacecraft returned images and compositional data showing that terrains on Pluto span a variety of ages, ranging from relatively ancient, heavily cratered areas to very young surfaces with few-to-no impact craters. One of the regions with very few …

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GIANT ICE VOLCANOS ON PLUTO: UPDATES ON CRYOVOLCANIC MODELING

K. N. Singer, Oliver Luke White, Erika L. Rader, Bernard Schmitt et autres

The putative cryovolcanic terrains on Pluto described here are unique in morphology compared to other areas of Pluto and to any other imaged surface in the solar system. The region is a vast area of giant mounds (50+ km across and 1-7 …

Exploring morphometry, composition, and cryovolcanic emplacement mechanisms for the Wright Mons Region on Pluto

K. N. Singer, Oliver Luke White, Bernard Schmitt, Erika L. Rader et autres

Europa Clipper Preparatory Photometry to Constrain Surface Properties

Rajani D. Dhingra, B. J. Buratti, Benoît Seignovert

Abstract We infer the surface reflectance properties of Europa using multispectral data sets available from previous missions. We use 21 full-disk images of Europa from Voyager’s Imaging Science System, Galileo’s Solid State Imaging, and New Horizons’ Long Range Reconnaissance Imager at differing …

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New Frontiers Titan Orbiter

Jason W. Barnes, Alexander G. Hayes, Jason M. Soderblom, Shannon MacKenzie et autres

As one of two planetary objects (other than Earth) that have solid surfaces, thick atmospheres, and astrobiological significance, Titan, like Mars, merits ongoing study with multiple spacecraft.We propose that a Titan orbiter dedicated to geophysics, geology, and atmospheric science be added to …

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Surface Temperature Decrease at Bright Ephemeral Feature Site on Titan's North Pole

Rajani D. Dhingra, Don E. Jennings, Jason W. Barnes, V. Cottini

Lower Surface Temperature at Bright Ephemeral Feature Site on Titan's North Pole

Rajani D. Dhingra, Donald E. Jennings, Jason W. Barnes, V. Cottini

Abstract We report a temperature difference in one of the regions on Titan that is, documented as a bright ephemeral feature (BEF). Spectra were recorded by Cassini's Composite Infrared Spectrometer. BEFs are 5 µm bright areas that appear, disappear, and shift from …

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Prospects of Cryovolcanic Columnar Joints on Titan

Michael F. Heslar, Rajani D. Dhingra