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Lecture

7.3 Spacecraft Exploration of the Solar System

2 Pages
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Department
Astronomy & Astrophysics
Course Code
AST101H1
Professor
C.B.Netterfield

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7.3 Spacecraft Exploration of the Solar System
-robotic spacecraft
-operate primarily with preprogrammed instructions
-robotic missions falls into 4 major categories
-Flyby: a spacecraft on a flyby goes past a world just once and then continues on its way
-Orbiter: an orbiter is a spacecraft that orbits the world it is studying, allowing longer-term study
during its repeated orbits
-Lander or probeWKHVHVSDFHFUDIW DUH GHVLJQHGWRODQG RQDSODQHVVXUIDFHRUSUREHDSODQHW·V
atmosphere by flying through it. Some landers carry rovers to explore wider regions
-sample return mission: a sample return mission requires a spacecraft designed to return to Earth
carrying a sample of the world it has studied.8il
-choice of spacecraft depends on scientific objectives and cost
Flyby
-cheaper than other missions because it is less expensive to launch into space
-launch costs depend largely on weight and onboard fuel is a significant part of that weight
-but once a spacecraft is on its way, the lack or friction or air drag in space means that It can maintain
its orbital trajectory through the solar system without using any fuel
-fuel is only needed when changing from one trajectory (orbit) to another
-but this can be made for free by taking advantage of the gravity of other planets (gravitational
slingshot)
-only offers a short period of close up study
-but can provide valuable scientific information
-9R\DJHUKHOSHGGLVFRYHU-XSLWHU·VULQJVDQGOHDUQDERXWWKHULQJVRI6DWXUQ8UDQXVDQG1HSWXQH
-the gravitational effects of the planets and their moons on the spacecraft itselt provide information
about object masses and densities
Orbiter
-more expensive than flyby
-primarily because the orbiter must carry extra fuel for it to change from an interplanetary
trajectory to a path that puts it into orbit around another world
-effective for study use for a long period than a flyby
-we have sent orbiters to the Moon, Venus, Mars, Jupiter, Saturn and the asteroid, Eros.
Landers or Probes
-the most up close and personal study of other worlds
-sends probes into the atmospheres or landers to the surfaces
-landers typically require fuel to slow down their descent to a planetary surface
-*DOLOHRVSDFHFUDIWGURSSHGDSUREHLQWR-XSLWHU·VDWPRVSKHUHLQ
-measure temperature, pressure, composition, radiation for about an hour but then it was destroyed
E\-XSLWHU·VKLJKLQWHULRUSUHVVXUHVDQGWHPSHUDWXUHV
Sample Return Missions
-missions that will scoop up samples from other worlds and return them to Earth for a more detailed
study
-the only one that was done is to the Moon
Combination Spacecraft
-many missions combine more than one type of spacecraft
-Galileo mission
-RUELWHUWKDWVWXGLHG-XSLWHUDQGDSUREHWKDWHQWHUHG-XSLWHU·VDWPRVSKHUH
-Cassini spacecraft
-flybys of Venus, earth and Jupiter
-spacecraft itself is an orbiter studying Saturn and its moons
-also carried the Huygens probe that landed on Titan
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Description
7.3 Spacecraft Exploration of the Solar System -robotic spacecraft -operate primarily with preprogrammed instructions -robotic missions falls into 4 major categories -Flyby: a spacecraft on a flyby goes past a world just once and then continues on its way -Orbiter: an orbiter is a spacecraft that orbits the world it is studying, allowing longer-term study during its repeated orbits -Lander or probe9K08085,.0.7,19,7008LJ3094O,343,5O,30988:71,.047574-0,5O,3098 atmosphere by flying through it. Some landers carry rovers to explore wider regions -sample return mission: a sample return mission requires a spacecraft designed to return to Earth carrying a sample of the world it has studied.8il -choice of spacecraft depends on scientific objectives and cost Flyby -cheaper than other missions because it is less expensive to launch into space -launch costs depend largely on weight and onboard fuel is a significant part of that weight -but once a spacecraft is on its way, the lack or friction or air drag in space means that It can maintain its orbital trajectory through the solar system without using any fuel -fuel is only needed when changing from one trajectory (orbit) to another -but this can be made for free by taking advantage of the gravity of other planets (gravitational slingshot) -only offers a short period of close up study -but can provide valuable scientific information -4,J07K0O50L8.4;07-:5L90787L3J8,3O0,73,-4:99K07L3J841$,9:73&7,3:8,3
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