Tog

2010-Jan-25, 06:36 PM

I may have found an error in the book Starlist 2000. It's a catalog of stars that includes the basic formulas used in astronomy. Since I had sucha hard time at Algebra, I try to run through the examples of how to used the formula to make sure I'm doing it right. In this case it seems pretty straight forward, but I get a different answer.

The sample is comparing the magnitudes of Deneb and Arcturus, 1.25 and -0.04 respectively. The method is given as:

2.512(m2-m1)

which comes out to be

2.512(1.25+0.04) or 2.5121.29

WhenI put that in, it comers out 3.28. The book gets 3.05. which would be 2.512(1.25-0.04).

Did they mess up the sign in the formula, or did they drop it from the calculation in the example?

Thanks.

The sample is comparing the magnitudes of Deneb and Arcturus, 1.25 and -0.04 respectively. The method is given as:

2.512(m2-m1)

which comes out to be

2.512(1.25+0.04) or 2.5121.29

WhenI put that in, it comers out 3.28. The book gets 3.05. which would be 2.512(1.25-0.04).

Did they mess up the sign in the formula, or did they drop it from the calculation in the example?

Thanks.