Welcome to http://www.handsonuniverse.org/activities/Explorations/PennyMagnitudes
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.|
|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.
* What new questions do you have about stars?
** 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.
* HOU Explorations *