the mathematics of space rendezvous
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The Mathematics of Space Rendezvous. NASA has a variety of classroom activities designed to accompany the video. Click here to explore. Overview. The NASA video illustrates the use of algebra and estimation in shuttle flight and rendezvous. - PowerPoint PPT PresentationTRANSCRIPT
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The Mathematics
of Space Rendezvous
NASA has a variety of classroom activities designed to accompany the video. Click here to explore.
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Overview
The NASA video illustrates the use of algebra and estimation in shuttle flight and rendezvous.
The accompanying slides demonstrate the problems that the astronauts pose and provide extra support as the problems are worked.
NASA has developed a learning guide to accompany this video.
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Rendezvous
Have you ever missed an appointment?
How did it make you feel?
How did it make the other party feel?
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Rendezvous
What is a rendezvous?See the video for definitions.
How can you plan ahead to get there on time?
How do astronauts calculate where and when to meet in space?
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Math… The Language of the Universe
Mathematics is an essential part of space travel.
Mathematics even helps us travel on earth.
It is more than numbers and symbols!
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Math… The Language of the Universe
What instruments did early space travelers use to calculate mathematical equations?
What instruments do space travelers use today to calculate mathematical equations?
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Math aboard the Space Shuttle
The Shuttle Design The Launch Navigation The Landing The Rendezvous
NASA
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Rendezvous…
Can you think of examples of rendezvous?
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Rendezvous…
Is like playing frisbee catch with a dog.
Is like a quarterback throwing a timing route pass to a wide receiver.
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Questions
First: What question needs to be answered?
When will the target (the Mir) be at the When will the target (the Mir) be at the rendezvous site (over Moscow)?rendezvous site (over Moscow)?
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The Target
Altitude of 400 kilometers. Orbit is at 92 minutes. Incline of the orbit is 51.6’. Earth revolves once
every 24 hours.
Gather the known facts:
Find out more about the Mir.
NASA
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The Target
More facts: Moscow is at 37’ E longitude. Mir’s present longitude is at 105’ E.
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Questions
Review the questions again: When will the target be at the
rendezvous site? When will it pass over
the rendezvous site?
Check out where the space station is right now on this real time site.
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Questions
What other information do we need to solve this problem?
Degrees the earth rotates in the time it takes Mir to make one orbit.
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Set Up the Equations
360° in a full circle or around the earth.
The earth rotates once in 24 hours.
Mir’s orbit takes 92 minutes.
Recall known and previous given facts:
NASA
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Set Up the Equations
The following ratio determines how far the Earth rotates with each orbit of the Mir
360° = x 24 hours 92 min
We need these in common terms, let’s change the hours into minutes.
(24 hours is 1440 minutes) Here is the problem again:
360° = x 1440 min 92 min
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Questions
What other information do we need to solve this problem?
How far it is between Moscow and where the space station is currently.
The angular distance between the Mir’s present locationand its rendezvous point is 105o – 37o or 68o.
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Questions
What other information do we need to solve this problem?
How long it takes Mir to make one orbit. We were given this information earlier.
Mir’s orbit takes 92 minutes.
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Calculate
X = 92 min x 360o
= 23o
1440 min
The Earth rotates 23o each time Mir
circles it once.
To rendezvous at the designated location, the Earth must rotate 68
o.
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Calculate
Mir must circle Earth.
orbits or orbit 323
68
If it takes 92 min per orbit, thenIf it takes 92 min per orbit, then
3 orbits x 92 min = 276 min = 4.6 hrsorbit
oo
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Orbital Altitude
How does orbital altitude affect an objects travel?
SpeedOrbitRendezvous
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Questions
How fast is Mir traveling in its orbit?
How fast is the shuttle traveling?
How can be at the same place and match speed? NASA
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Gather the Facts
Mir’s altitude is 400 km and speed is 92 min/revolution.
The shuttle’s altitude is 298 km and speed is 89 min/revolution.
The Earth’s radius is 6,378 km.
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Known Facts
Orbit is almost a circle
Circumference of a circle
C = 2r NASA
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Known Facts
Equation for speed
Speed = Distance/Time
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Mir’s Orbit
First the formula:Speed = C (Mir’s orbit) / R (minutes)
Then the facts:Mir orbits at a distance of 6,378 + 400 km
Find Mir’s orbit:C (Mir’s orbit) = 6,778 km x 2(pi)= 42,578 km per orbit.
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Mir’s Speed
The formula again:Speed = C (Mir’s orbit) / R (minutes)
Put in Mir’s orbit:Speed = 42,587 km/92 min
Solve the equation:Speed of Mir = 463 km/min = 27,780 km/hr
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Speed of the Shuttle
First the formula:Speed = C (shuttle) / R (minutes)
Find the shuttle orbital radius:637 km x 298 km = 41,947 km
Put in the facts:Speed = 41,947 km / 89 min
Calculate: Speed of the Shuttle = 471 km/min = 28,260 km/hr
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Slow Down to Rendezvous
The space shuttle must slow down to rendezvous with Mir.
To slow down, the shuttle will climb to Mir’s higher orbit.
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Gather the Facts
0.4 meters per second increase in velocity equals 1 km increase in altitude.
Present altitude is 298 km.
Need to increase altitude to 305 km.
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Question
How many meters per second does the shuttle need to increase to rise 7 km?
NASA
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Set Up the Equations
An increase of 2.8 m/s will increase the orbit
of the shuttle 7 km and actually slow it down!
Desired – current = needed increase in altitude
305 km – 298 km = 7 km
Recall: 0.4 m/s increase in velocity = 1 km increase in altitude .
7 (km) / 1 (km) x .4 (m/s) = 2.8 m/s
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Shuttle Instruments
Shuttle instruments can show this process graphically.
The astronauts can also see the Mir through the windows.
Virtual view of Mir through the shuttle window.
NASA
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Views from Space
The video is showing videos that were taken by the astronauts. More videos and photos are available at NASA’s web site.
Click on this slide to see more photos.
NASA
NASA
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It takes Math to Rendezvous in Space
The astronauts use both: Computer calculations Math estimation skills
Try another math activity with airplanes.
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Math of the Universe
Whether it is using scientific notation to measure the microscopic or astronomic, whether it is estimation or calculus, mathematics plays a big part in science.
Read more about experiments performed aboard the shuttle and space station.
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Math on Earth
The video is showing some examples of everyday activities that need math. Can you think of others?
Explore a web site with activities focusing on every day math.
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Math and Rendezvous
The video and slides have illustrated a few problems that the space shuttle astronauts need to estimate while on a single space flight.
Space travel and travel on earth have similarities. Work with your class to create earth examples of rendezvous.
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Math and Rendezvous
Math is an important part of making meetings in space and on earth prompt and accurate.
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