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Penny Magnitudes |
Use pennies and a calculator to show the value of each magnitude category for stars. Star magnitudes are represented by six traditional categories. Category six represents the dimmest stars one can see without using a telescope. Category one represents the brightest.
Write magnitudes and calculator steps on each plate. | |
Magnitudes | Calculator Steps |
6th | 1 penny = _________ penny |
5th | 1 x 2.51 = _________ pennies |
4th | 1 x 2.51 x 2.51 = _________ pennies |
3rd | 1 x 2.51 x 2.51 x 2.51 = _________ pennies |
2nd | 1 x 2.51 x 2.51 x 2.51 x 2.51 = _________ pennies |
1st | 1 x 2.51 x 2.51 x 2.51 x 2.51 x 2.51 = _________ pennies |
Look at the plates of pennies. Think about star magnitudes!
1. How many pennies are on the sixth magnitude plate? ________
2. How many pennies are on the first magnitude plate? ________
3. Which is dimmer, a fifth magnitude star or a second magnitude star? _________________________
4. Which is brighter, a second magnitude star or a third magnitude star? _________________________
5. How many times brighter is a first magnitude star than a sixth magnitude star? _______________
* Describe the magnitude scale for stars in your own words.
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* What new questions do you have about stars?
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** Try graphing your results. Place magnitude values on the X axis. Connect the plotting points with a curve. Put numbers by fives up the Y axis from 0 to 100. Describe the slope of this curve.
01/16/2000
* HOU™ Explorations *