LIVE INTERACTIVE LEARNING @ YOUR DESKTOP NASA Eyes on Earth What s up? Satellites Presented by: Christopher Blair May 23, 2011
www.nasa.gov National Aeronautics and Space Administration NASA s Launch Services Program presents: NASA s Eyes on the Earth Outreach Specialist Christopher Blair christopher.e.blair@nasa.gov
www.nasa.gov National Aeronautics and Space Administration QUESTION 1
Which is the correct position for the Sun? A B www.nasa.gov
A www.nasa.gov
B www.nasa.gov
www.nasa.gov National Aeronautics and Space Administration Know Earth s Orbit is an Ellipse but is drawn almost like a circle Know that the Sun isn t in the exact CENTER of the solar center.
www.nasa.gov National Aeronautics and Space Administration QUESTION 2
www.nasa.gov National Aeronautics and Space Administration Do all planets orbit our Sun at the same speed? Yes X No
www.nasa.gov
Pause for Questions?
What are the types of Satellites? Artificial or Natural?
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Artificial Satellites
TYPES OF SATELLITES
Communication Reconaissance Search and Rescue Atmospheric Studies Weather Navigation Space Exploration Astronomy Remote Sensing
HOW DOES A SATELLITE WORK? Your Title Here 20
WHAT IS REMOTE SENSING?
Eyjabakkajökull Glacier, Iceland 2000
Remote sensing is any technique for measuring, observing or monitoring a process or object without physically touching it. Your Title Here 25
Electromagnetic Spectrum Your Title Here 27
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Pause for Questions?
What is an Orbit? The curved path an object takes around another. Controlled by Gravity & Forward Motion.
ORBIT ATTRIBUTES POSITION PERIOD ECCENTRICITY INCLINATION
www.nasa.gov National Aeronautics and Space Administration ORBITAL POSITION APO means AWAY. PERI means NEAR.
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ORBITAL PERIOD
http://www.youtube.com/watch?v=fxws11gxwgs
http://www.windows2universe.org/physical_sci ence/physics/mechanics/orbit/perihelion_apheli on.html&edu=high This image and text is [select one: from, based on content from, derivative from content on] Windows to the Universe (http://windows2universe.org) 2010, National Earth Science Teachers Association. This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License. www.nasa.gov
ORBITAL ECCENTRICITY CIRCLE or ELLIPSE?
ECCENTRICITY How elongated an elliptical orbit is measured by it s eccentricity.
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ORBITAL INCLINATION
90 degrees 45 degrees 0 degrees
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www.nasa.gov National Aeronautics and Space Administration CREATING AN ORBIT
www.nasa.gov National Aeronautics and Space Administration
Pause for Questions?
What are the types Of Orbits?
LOCATION OF ORBITS Geocentric Lunacentric Heliocentric Areocentric Galactocentric
ALTITUDE OF ORBITS LEO MEO Geosynchronous Geostationary Sun Snychronous LaGrange Molniya Orbit HAPs
LOW EARTH ORBIT (LEO) Typical Uses: Manned Spacecrafts, Military, Observation
PROS 14+ orbits/day Better Signal Strength Higher Fidelity/Resolution Data CONS Limited Earth view Short time over area Limited view of the Earth Expensive Tracking Stations Reacts to gravity, drag, etc.
GEOSATIONARY ORBIT
http://www.youtube.com/watch?v=48vksga5v1w
PROS Large coverage area. Constant view of selected area. 24 hour communication. CONS Doesn t image the poles. Time Delay due to distance. Overcrowding / Traffic.
POLAR ORBITS
http://www.youtube.com/watch?v=vx-yby8siky
http://www.youtube.com/watch?v=hahaiwctglo
POLAR PROS a) Sees more of Earth b) Better signal strength. c) Less time delay. CONS a) Orbital Decay from Atmosphere b) No Continual Imagery c) Expensive Tracking Stations
LAGRANGE ORBITS 66
SOHO Solar Heliospheric Observatory 67
LAGRANGE ORBITS 68
WMAP 69
LAGRANGE ORBITS 70
James Webb Space Telescope 71
LAGRANGE ORBITS 72
STEREO Your Title Here 73
LAGRANGE ORBITS 74
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