STAR COUNT RESULTS
Name _______________________________ Lab Night _________________
STAR COUNT (Rev 9/12)
Everyone has to get a tube and make their own measurements. No copying. Keep tube until you have made tube measurements below (part II B).
PART I OUTSIDE (3 pts each)
If you could get away from city light on a moonless night you could see about 2500 stars. Due to the lights and things blocking part of the sky you will see a much smaller number of stars here. See how many stars listed below you can see. Locate using charts. Put one of the choices in blank beside star name.
Choices are: Visible, Sky Too Bright (not dark enough, too many campus lights), Clouds (in that part of sky), Blocked (by buildings or trees), Below Horizon. Only look for those stars in list for this term.
Fall List Spring List
Vega ____________ Sirius _________
Deneb ____________ Castor _________
Antares ____________ Betelgeuse _________
Altair ____________ Rigel _________
Polaris ____________ Aldebaran _________
Alberio ___________ Polaris _________
Arcturus ____________ Regulus __________
Fomalhaut ____________ Spica ___________
Mizar _______________ Denebola ________
PART II
A) OUTSIDE Circle correct answer for the describe items below (5 pts each). Then look at 10 different area of the sky through the tube and count the number of stars visible. You may need to wait your eye to adjust to the darkness. If you do not see any stars try a different area. Record counts in table.
Describe the weather conditions
Crystal Clear Clear with some haziness Few small clouds Mostly Cloudy
Describe the lighting conditions
Dark, city lights off in the distance Somewhat dark, no street lights closeby
Usual lousy conditions in front of physics building
Describe the Moon tonight
Not visible during lab period Thin crescent Quarter Moon Gibbous Full
| Record your count results for your 10 trials (cannot be zero). 2 pts ea |
| | | |
|Quantity |Value | How You Would Find These |
|Length |30 | measure in cm |
|Diameter |7 | measure in cm |
|Star Count (n) |1.3000 | calculate |
|Field View Angle |13.31 | calculate |
|Area of Tube |38.48 | calculate |
|Hemisphere Area |5654.86 | calculate |
|Percent |0.6806 | calculate |
| | | |
|# Stars (N) |191.0 | calculate |
|% Galaxy |9.55102E-08 | calculate |
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