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A yellow giant of spectral type G5III , The northerly nature of the constellation means that the variable stars can be observed all year : the red giant R Ursae Minoris is a semiregular variable varying from magnitude 8.5 to 11.5 over 328 " days , while S Ursae Minoris is a long period variable that ranges between magnitudes 8.0 and 11 over 331 " days .
 R Ursae Minoris, S Ursae Minoris
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 R Ursae Minoris, S Ursae Minoris