Variability
This variable star changes in apparent magnitude from 4.3m to 5.1m with a period of 7.59 days. Its change in brightness is accompanied by a change in spectral classification, from G1 to F4. Based on its variability, W Sagittarii has been estimated to be approximately 1,500 light years from Earth.
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Famous quotes containing the word variability:
“The grand points in human nature are the same to-day they were a thousand years ago. The only variability in them is in expression, not in feature.”
—Herman Melville (1819–1891)