Phil Christensen

Last updated
Phil Christensen
Phil Christensen.jpg
photo courtesy NASA/JPL-Caltech (2005)
Born1953
NationalityAmerican
Alma mater University of California, Los Angeles
Awards Whipple Award (2018)
Scientific career
Fields Planetary geology
Institutions Arizona State University

Philip Russel Christensen (born 1953) is a geologist whose research interests focus on the composition, physical properties, processes, and morphology of planetary surfaces, with an emphasis on Mars and the Earth. He is currently a Regents' Professor and the Ed and Helen Korrick Professor of Geological Sciences at Arizona State University (ASU). [1]

Contents

Education

Christensen earned his B.S. degree in Geology from the University of California, Los Angeles in 1976. He earned his M.S. in 1978 and his Ph.D. in 1981 in Geophysics and Space physics, both from the University of California, Los Angeles.

Career

Along with serving on the faculty of the Department of Geology at Arizona State University since 1981, Christensen is the principal investigator for the Mars Global Surveyor Thermal Emission Spectrometer (TES), the Mars Odyssey THEMIS, the Europa Clipper Europa Thermal Emission Imaging System and the Lucy Thermal Emission Spectrometer instruments, as well as a co-investigator for the Mars Exploration Rovers, responsible for the Mini-TES instruments. He also serves on the research staff of the Center for Meteorite Studies museum on the ASU campus and is the director of the Mars Space Flight Facility. He served as co-chair of the Planetary Science Decadal Survey in 2022, with Robin M. Canup.

His discovery (based on Thermal Emission Spectrometer data) of crystalline hematite in Meridiani Planum was instrumental in that area's choice as the landing site for the Mars Exploration Rover Opportunity.

Awards and honors

Related Research Articles

<i>2001 Mars Odyssey</i> 2001 NASA orbiter studying the geology and hydrology of Mars

2001 Mars Odyssey is a robotic spacecraft orbiting the planet Mars. The project was developed by NASA, and contracted out to Lockheed Martin, with an expected cost for the entire mission of US$297 million. Its mission is to use spectrometers and a thermal imager to detect evidence of past or present water and ice, as well as study the planet's geology and radiation environment. It is hoped that the data Odyssey obtains will help answer the question of whether life existed on Mars and create a risk-assessment of the radiation that future astronauts on Mars might experience. It also acts as a relay for communications between the Curiosity rover, and previously the Mars Exploration Rovers and Phoenix lander, to Earth. The mission was named as a tribute to Arthur C. Clarke, evoking the name of his and Stanley Kubrick's 1968 film 2001: A Space Odyssey.

<span class="mw-page-title-main">Gusev (Martian crater)</span> Crater on Mars

Gusev is a crater on the planet Mars and is located at 14.5°S 175.4°E and is in the Aeolis quadrangle. The crater is about 166 kilometers in diameter and formed approximately three to four billion years ago. It was named after Russian astronomer Matvey Gusev (1826–1866) in 1976.

<span class="mw-page-title-main">Meridiani Planum</span> Plain located 2 degrees south of Mars equator

The Meridiani Planum (alternately Meridiani plain, Meridiani plains, Terra Meridiani, or Terra Meridiani plains) is either a large plain straddling the equator of Mars and covered with a vast number of spherules containing a lot of iron oxide or a region centered on this plain that includes some adjoining land. The plain sits on top of an enormous body of sediments that contains a lot of bound water. The iron oxide in the spherules is crystalline (grey) hematite (Fe203).

<span class="mw-page-title-main">Steve Squyres</span> Professor of Physical Sciences at Cornell University

Steven Weldon Squyres is an American astronomer and planetary scientist. He was the James A. Weeks Professor of Physical Sciences at Cornell University in Ithaca, New York. His research area is in planetary sciences, with a focus on large solid bodies in the Solar System such as the terrestrial planets and the moons of the Jovian planets. Squyres was the principal investigator of the Mars Exploration Rover Mission (MER).

<span class="mw-page-title-main">Martian spherules</span> Small iron oxide spherules found on Mars

Martian spherules (also known as hematite spherules, blueberries, & Martian blueberries) are small spherules (roughly spherical pebbles) that are rich in an iron oxide (grey hematite, α‐Fe2O3) and are found at Meridiani Planum (a large plain on Mars) in mind-bogglingly large numbers.

<span class="mw-page-title-main">Thermal Emission Imaging System</span> Camera system

The Thermal Emission Imaging System (THEMIS) is a camera on board the 2001 Mars Odyssey orbiter. It images Mars in the visible and infrared parts of the electromagnetic spectrum in order to determine the thermal properties of the surface and to refine the distribution of minerals on the surface of Mars as determined by the Thermal Emission Spectrometer (TES). Additionally, it helps scientists to understand how the mineralogy of Mars relates to its landforms, and it can be used to search for thermal hotspots in the Martian subsurface.

Thermal infrared spectroscopy is the subset of infrared spectroscopy that deals with radiation emitted in the infrared part of the electromagnetic spectrum. The emitted infrared radiation, though similar to blackbody radiation, is different in that the radiation is banded at characteristic vibrations in the material. The method measures the thermal infrared radiation emitted from a volume or surface. This method is commonly used to identify the composition of surface by analyzing its spectrum and comparing it to previously measured materials. It is particularly suited to airborne and spaceborne applications.

<span class="mw-page-title-main">Mini-TES</span> Infrared spectrometer used for detecting the composition of a material

The Miniature Thermal Emission Spectrometer (Mini-TES) is an infrared spectrometer used for detecting the composition of a material from a distance. By making its measurements in the thermal infrared part of the electromagnetic spectrum, it has the ability to penetrate through the dust coatings common to the Martian surface which is usually problematic for remote sensing observations. There is one on each of the two Mars Exploration Rovers.

<span class="mw-page-title-main">Lunar and Planetary Laboratory</span> Lab at University of Arizona

The Lunar and Planetary Laboratory (LPL) is a research center for planetary science located in Tucson, Arizona. It is also a graduate school, constituting the Department of Planetary Sciences at the University of Arizona. LPL is one of the world's largest programs dedicated exclusively to planetary science in a university setting. The Lunar and Planetary Lab collection is held at the University of Arizona Special Collections Library.

The Mars Space Flight Facility is located at Arizona State University in Tempe, Arizona.

<span class="mw-page-title-main">James F. Bell III</span> American astronomer

James F. Bell III is a professor of Astronomy at Arizona State University, specializing in the study of planetary geology, geochemistry and mineralogy using data obtained from telescopes and from various spacecraft missions. Bell's active research has involved the NASA Mars Pathfinder, Near Earth Asteroid Rendezvous (NEAR), Comet Nucleus Tour (CONTOUR), 2001 Mars Odyssey, Mars Reconnaissance Orbiter, Lunar Reconnaissance Orbiter, and the Mars Science Laboratory missions. His book Postcards from Mars includes many images taken by the Mars rovers. Bell is currently an editor of the space science journal Icarus and president of The Planetary Society. He has served as the lead scientist in charge of the Panoramic camera (Pancam) color imaging system on Mars rovers Spirit and Opportunity.

<span class="mw-page-title-main">Mawrth Vallis</span> Valley on Mars

Mawrth Vallis is a valley on Mars, located in the Oxia Palus quadrangle at 22.3°N, 343.5°E with an elevation approximately two kilometers below datum. Situated between the southern highlands and northern lowlands, the valley is a channel formed by massive flooding which occurred in Mars’ ancient past. It is an ancient water outflow channel with light-colored clay-rich rocks.

<span class="mw-page-title-main">Bruce Jakosky</span> American scientist

Bruce Martin Jakosky is a professor of Geological Sciences and associate director of the Laboratory for Atmospheric and Space Physics (LASP) at the University of Colorado, Boulder. He has been involved with the Viking, Solar Mesosphere Explorer, Clementine, Mars Observer, Mars Global Surveyor, Mars Odyssey, Mars Science Laboratory and MAVEN spacecraft missions, and is involved in planning future spacecraft missions.

<span class="mw-page-title-main">Margaritifer Sinus quadrangle</span> One of a series of 30 quadrangle maps of Mars

The Margaritifer Sinus quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey (USGS) Astrogeology Research Program. The Margaritifer Sinus quadrangle is also referred to as MC-19. The Margaritifer Sinus quadrangle covers the area from 0° to 45° west longitude and 0° to 30° south latitude on Mars. Margaritifer Sinus quadrangle contains Margaritifer Terra and parts of Xanthe Terra, Noachis Terra, Arabia Terra, and Meridiani Planum.

The mineralogy of Mars is the chemical composition of rocks and soil that encompass the surface of Mars. Various orbital crafts have used spectroscopic methods to identify the signature of some minerals. The planetary landers performed concrete chemical analysis of the soil in rocks to further identify and confirm the presence of other minerals. The only samples of Martian rocks that are on Earth are in the form of meteorites. The elemental and atmospheric composition along with planetary conditions is essential in knowing what minerals can be formed from these base parts.

<span class="mw-page-title-main">Ronald Greeley</span> Planetary geologist (1939–2011)

Ronald Greeley was a Regents’ Professor in the School of Earth and Space Exploration (SESE) at Arizona State University (ASU), the Director of the NASA-ASU Regional Planetary Image Facility (RPIF), and Principal Investigator of the Planetary Aeolian Laboratory at NASA-Ames Research Center. He was involved with lunar and planetary studies since 1967 and most recently focused his research on understanding planetary surface processes and geologic histories.

<span class="mw-page-title-main">Composition of Mars</span> Branch of the geology of Mars

The composition of Mars covers the branch of the geology of Mars that describes the make-up of the planet Mars.

<span class="mw-page-title-main">Ogygis Undae</span> Martian dune field

Ogygis Undae is the only named southern hemisphere dune field on Mars. It is named after one of the classical albedo features on Mars, Ogygis Regio. Its name, which refers to Ogyges, a primeval mythological ruler in ancient Greece, was officially approved by the International Astronomical Union (IAU) on September 17, 2015. It is situated just outside Argyre Planitia, a plain located in the southern highlands of Mars. The dunes of Ogygis Undae extend from latitude −49.94°N to −49.37°N and from longitude 292.64°E to 294.93°E. They are centered at latitude −49.66°N, longitude 293.79°E (66.21°W), and extend approximately 87 km to the east and west from there. Ogygis Undae has an area of 1904 km2, and due to its large size is a primary subject for research on Martian dune morphology and sand composition.

The Europa Thermal Emission Imaging System (E-THEMIS) instrument is designed to scan the surface of Europa and identify areas of geologically recent resurfacing through the detection of subtle thermal anomalies. This 'heat detector' will provide high spatial resolution, multi-spectral thermal imaging of Europa to help detect active sites such as outflows and plumes. E-THEMIS will be launched on board the planned Europa Clipper astrobiology mission to Jupiter's moon Europa in 2025.

<span class="mw-page-title-main">MicrOmega-IR</span>

MicrOmega-IR is an infrared hyperspectral microscope that is part of the science payload on board the European Rosalind Franklin rover, tasked to search for biosignatures on Mars. The rover is planned to land on Mars in the mid- or late 2020s. MicrOmega-IR will analyse in situ the powder material derived from crushed samples collected by the rover's core drill.

References

  1. 1 2 "(90388) Philchristensen". Minor Planet Center. Retrieved 22 January 2020.
  2. "Space scientists meet at ASU to plan Mars exploration | ASU Now: Access, Excellence, Impact". ASU news – Arizona State University. 2009-09-04. Retrieved 22 January 2020.
  3. "Asteroids named for 2 ASU professors". 3TV. Phoenix, Arizona. March 11, 2016. Archived from the original on 20 September 2016.
  4. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 22 January 2020.
  5. "2018 AGU Section Awardees and Named Lecturers". AGU. Retrieved 22 January 2020.