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Star Counts Lab

# Star Counts Lab - Star Counts Parker R Watson Adam Trotter...

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Star Counts Parker R. Watson January 23, 2007 Adam Trotter Astronomy 101 Section 412 “I pledge that I have neither given nor received any unauthorized aid on this report.”

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Data and Calculations NAKED-EYE COUNTS SAMPLE 1 Area Number of Stars Counted Sky Condition 1 12 Polluted 2 25 Polluted 3 5 Polluted 4 23 Polluted 5 21 Polluted Total 86 NAKED-EYE COUNTS SAMPLE 2 Area Number of Stars Counted Sky Condition 6 18 Unpolluted 7 28 Unpolluted 8 34 Unpolluted 9 14 Unpolluted 10 14 Unpolluted Total 108 SUMMARY OF RESULTS Total Number of Stars Visible in Sample 1 2786.4 Total Number of Stars Visible in Sample 2 3499.2 Ratio of Sample 1 to Sample 2 79.6% Percent Error of Sample 1 7.1% Percent Error of Sample 2 16.6% Given Formulae/Information: A 1 = Total area of visible sky = 2ΠL 2 A 2 = Area seen through hole = ΠD 2 /4 Observed Area = 5(A 2 ) Stars visible to naked eye = (total counted) (1.6L 2 /D 2 ) Percent error = 100 (|observed-actual|/actual) D = hole diameter = 2 cm L = hole length = 9 cm Stars in the sky = ~3000 Stars visible to naked eye = (total counted) (1.6L 2 /D 2 )
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Star Counts Lab - Star Counts Parker R Watson Adam Trotter...

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