exploring saturn activities - txmost · • the farthest moon from saturn is actually orbiting very...
TRANSCRIPT
Exploring SaturnActivities
Tom HootenDirector, Hudnall Planetarium
NASA/JPL Solar System Ambassador
The Current Mission
Cassini – Huygens
1997-2008
Launched: 7 Year cruise on
October 15, 1997 VVEJGA trajectory
3
Cassini SpacecraftSpacecraft Specs
Height: 6.8 m (22 ft)
Diameter: 4 m (13 ft)
Mass: 2500 kg (2.8 tons)
(fueled): 5600 kg (6 tons)
Power: 700 Watts at SOI
4
SOI
Tour
Overview4 year Prime Mission
– 75 orbits
– 45 targeted Titan flybys
– 9 targeted icy satellite flybys
5 Science Objectives
– Titan
– Saturn
– Rings
– Icy Satellites
– Magnetosphere
The Planet
Saturn’s Clouds
Saturn Educator’s
Guide
What is a system?solar system
school system
computer system
stereo system
digestive system
telephone system
air-conditioning system
cable-tv system
Some things all systems have:
• Parts
• Interactions between parts
• Inputs
• Outputs
How is Saturn a system?
• Parts
– planet
– rings
– moons
How is Saturn a system?
• Interactions between parts
– moon-ring
– moon-moon
– moon-planet
How is Saturn a system?
• Inputs
– sunlight, gravity
How is Saturn a system?
• Outputs
– reflected sunlight, radio waves
Let’s look at the rings more closely.
Building a Saturn System Diagram
1
• Saturn's rings are not solid, but are
composed of many chunks of ice and
rock that range in size from a grain of
sand to as big as a house. The names
of the rings in the order they appear from
the cloud tops of Saturn outward toward
the moon Titan are:
_____ _____ _____ _____ _____
_____ _____
2
• Jean-Dominique Cassini is the person
who discovered a division (gap) in
Saturn's rings in 1659. The _____ and
_____ rings are on either side of the
Cassini Division.
3
• The narrowest rings by far are the _____
ring and the _____ ring.
4
• Which of Saturn's rings am I pointing to
now? _____
5
• There are _____ (a number) moons
orbiting Saturn at distances closer to the
planet than the G ring.
6
• There are _____ (a number) moons
orbiting Saturn at distances farther from
the planet than the G ring. (HINT: Don't
forget to count the moons that are farther
away than Titan.)
7
• The farthest moon from Saturn is actually
orbiting very slowly in the opposite
direction from all the other moons and
ring particles. It may be an asteroid
captured by Saturn's gravity. This moon
is called _________.
8
• _______________ is the force that holds
the moons and the ring particles in orbit
around Saturn.
9
• The widest ring of Saturn has a moon called Enceladus orbiting within it. Enceladus has ice volcanoes that erupt and send particles up so high that they escape the moon and supply the ______ ring with small ice particles.
10
• The _______ ring has a gap near its
outer edge caused by the tiny moon
named Pan.
11
• The narrow ________ ring is held
together ("shepherded") by the gravity of
the moons Prometheus and Pandora,
which orbit on either side of the ring.
12
• The gravitational forces between the tiny
moons Janus and Epimetheus cause
them to trade orbits with one another.
Both of these tiny moons are between
the ______ ring and the _____ ring.
• 13. Measure the scaled diameter of
the Earth in centimeters: ______.
• 14. Measure the scaled radius of
Saturn in centimeters: ______.
• 15. Measure the scaled distance to
the center of the moon Tethys:
______.
16
• Which is larger the distance from the
Earth to the moon or the distance
from the center of Saturn to the
outer edge of the E ring?_________
17
• Which is wider the A ring or the C
ring?_____
18
• Which is larger the Earth's moon
or Titan?_____
19
• Which is wider the Cassini Division
or the Enke Gap?_____
The Last Two Questions
• Did you have fun today?
• What did you learn today?
Gravitationally Assisted Flyby
Newton’s Cannon
Gravitational Effect
Gravity Assist
Gravity Assist Simulator
1. Fold 1” lip on bottom of sheet of paper.
2. Tape straw to top paper.
3. Drop ball bearing through straw and mark trajectory.
4. Place magnet near trajectory.
5. Notice how ball bearing’s trajectory is deviated.
6. Moving the magnet will create differing degrees of deviation.
More Resources
• Astronomy Teacher’s Workshop
– June 29th (register through ESC 7)
• Hudnall Planetarium
http://planetarium.tjc.edu
• Saturn Educators Guide & More
http://saturn.jpl.nasa.gov