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C/P 740
Winter Quarter 2008
Dr. Herbst
HOMEWORK ASSIGNMENT # 1
Due: Tuesday, 15 January
1. a) Determine the average orbital speed of the earth during its revolution around the
sun in units of km s
1.
b) The solar system is currently orbiting the center of the galaxy at a speed of 250 km
s
1
. How long will it take to make one revolution?
2. Determine the mass of the sun from the period and radius of the orbit of the earth.
Hint: look up the Newtonian form of Kepler’s Third Law and remember that the mass of
the sun is much greater than that of the earth.
3. Determine the standard parallax formula:
r
(
pc
)
=
1/
"
(
arc
sec)
. This expression is
derived for a baseline of 2 AU. Suppose parallax is measured with a smaller baseline
consisting of the diameter of the earth. Obtain an equivalent formula. Is there any use
for such a formula?
4. Determine the luminosity of the sun if the energy reaching the earth from the sun is
1400W/m
2
.
5. What is the absolute magnitude of a main sequence star with distance
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This note was uploaded on 06/13/2011 for the course CHEMISTRY 740 taught by Professor Herbst during the Winter '08 term at Ohio State.
 Winter '08
 Herbst
 Chemistry

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