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Uranometria 2000 labelling "R" or "RU"

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#1 Jsg

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Posted 24 March 2024 - 09:27 AM

In Uranometria 2000 you'll occasionally find an open circle with an R or RU labelling it. Open circles are for variable stars, but nowhere can I find text explaining the R or RU designation. What is it describing?

E.g.- plate 155, 25° 16h 10m designated RU, or same plate 18°20' 16h 6m designated R.

Not radio sources, which get a triangle.
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#2 Jsg

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Posted 24 March 2024 - 09:56 AM

Apparently it's a Bayer designation scheme for variable stars, well-covered in a wikipedia page titled "Variable-star designation".
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