492-pp5 - UNIVERSITY OF SOUTH ALABAMA Last time. Origin of...

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1 ES 492 (H): Planetary Geology Lecture 5: Mercury UNIVERSITY OF SOUTH ALABAMA Origin of sediment Last time… 1. Kepler Mission 2. What are comets? 3. What we know about comets 4. Remote sensing and kamikaze missions NASA’s Kepler Mission NASA Presentation Slide NASA’s Kepler Mission Kepler 6b Kepler’s photometer is very sensitve and measures the drop in stellar emission as planet(s) pass in front of a star NASA’s Kepler Mission NASA Presentation Slide NASA’s Kepler Mission NASA Presentation Slide
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2 NASA’s Kepler Mission NASA Presentation Slide Comets •Comets consist of rock, dust and frozen methane, and some other frozen gases that are “erupted” from a nucleus. ht p:/ www.hw.ac.uk/cheWWW/commchem/images/comet.gif Remote Sensing of Comets Our understanding about comets was revolutionized in 1986 when the first human contact was made with Halley’s comet Giotto: Agency: ESA (European Space Agency) Launched: July 2, 1985 HalLey’s Encounter: March 13, 1986; (Fly-by) Grigg-Skjellerup Encounter: July 10,1992; (Fly-by) Data: photography, ht p:/ www.esa.int/esaSC/120392_index_1_m.html Remote Sensing of Comets Our understanding about comets was revolutionized in 1986 when the first human contact was made with Halley’s comet Deep Impact: Agency: NASA Launched: January 12, 2005 Tempel 1 Encounter: July 2005 (Orbit) Impact: July 4, 2005 Data: photography, MRI, HRI (High Resolution instrument: imaging and IR spectrophotometer) ht p:/ apod.nasa.gov/apod/ap050516.html ht p:/ nssdc.gsfc.nasa.gov/planetary/image/deep_impact_hri.jpg HRI Remote Sensing of Comets Mineral/volatile content of ejecta 1 hour and 45 minutes following impact… …Silicates dominate the observed emission. pyroxenes, olivines, phyllosilicates ht p:/ www.nasa.gov/mission_pages/deepimpact/multimedia/ Ejecta viewed from Earth-based telescopes Remote Sensing of Comets HRI From Brit et al., 2002. Our knowledge about comet geology is limited. We do know that craters are rare and we assume that this is because the comets are low density “dirty snowballs”. From Brit et al., 2004.
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3 Today’s Agenda 1. Introduction to Mercury 2. Tectonics on the Earth 3. Geology of Mercury Mercury Historical Information •Known for at least 5000 years (Sumerians) ht p:/ www.bibliotecapleyades.net/imagenes_planetx/hercolobus34_02.gif Mercury Historical Information •Known for at least 5000 years (Sumerians) •Greeks called it Apollo (sunrise) and Hermes (sunset) ht p:/ www.badastronomy.com/pix/moon_mercury_march11_2005_b.jpg Mercury Historical Information •Known for at least 5000 years (Sumerians) •Greeks called it Apollo (sunrise) and Hermes (sunset) •First visit by a spacecraft was in 1974/75 ( Mariner 10 ; 3 flybys)
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492-pp5 - UNIVERSITY OF SOUTH ALABAMA Last time. Origin of...

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