92283
On early 20th century and older orthochromatic ( blue-sensitive ) photographic film , the relative brightnesses of the blue supergiant Rigel and the red supergiant Betelgeuse irregular variable star ( at maximum ) are reversed compared to what human eyes perceive , because this archaic film is more sensitive to blue light than it is to red light .
 Rigel, Betelgeuse
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Rigel, Betelgeuse