Lesson plan
Beta Librae
Beta Librae is the brightest star in the zodiac constellation of Libra. It has the proper name Zubeneschamali , Beta Librae is its Bayer designation. From parallax measurements taken by the Hipparcos mission, its distance is measured to be . The apparent visual magnitude of this star is 2.6. According to Eratosthenes, Beta Librae was observed to be brighter than Antares. Ptolemy, 350 years later, said it was as bright as Antares. The discrepancy may be due to Antares becoming brighter, but this is not known for certain. It could simply be caused by Beta Librae being a variable star, showing a present-day variability of 0.03 of a magnitude.
Article summary
Beta Librae is the brightest star in the zodiac constellation of Libra. It has the proper name Zubeneschamali , Beta Librae is its Bayer designation. From parallax measurements taken by the Hipparcos mission, its distance is measured to be . The apparent visual magnitude of this star is 2.6. According to Eratosthenes, Beta Librae was observed to be brighter than Antares. Ptolemy, 350 years later, said it was as bright as Antares. The discrepancy may be due to Antares becoming brighter, but this is not known for certain. It could simply be caused by Beta Librae being a variable star, showing a present-day variability of 0.03 of a magnitude.
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
Bibliography
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Key claims and bibliography are generated from the same tracked claims and sources as the article page.