Question 1483Navigation General

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The magnitude of three stars is indicated. Which star is the brightest?

A Vega + 0.1
B Altair + 0.9
C Antares + 1.2
D Cannot be determined; magnitude indicates size not brightness
AI Explanation

The correct answer is A) Vega + 0.1. The magnitude of a star indicates its brightness, with lower numbers representing brighter stars. Vega, with a magnitude of +0.1, is the brightest of the three stars listed. Altair has a magnitude of +0.9, which is less bright than Vega, and Antares has a magnitude of +1.2, which is the least bright of the three. Therefore, Vega is the brightest star based on the given magnitude information. The other options are incorrect because they do not represent the star with the lowest, and therefore brightest, magnitude value.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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