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apparent diameter |
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| 28" per year (or half the moon's apparent diameter in a century), is due in part to the fact that it is the second-nearest star, being at a distance of 5. Once generally thought to be about 5,800 kilometers across, its apparent diameter had shrunk in 1976 with the finding that it was shiny with methane ice, meaning that a smaller object--perhaps less than 3,500 km across--could be producing the same observed brightness. 28" per year (or half the moon's apparent diameter in a century), is due in part to the fact that it is the second-nearest star, being at a distance of 5. |
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