|1980 Mar.||U||0.8 (0.1)||99.0||2|
|1989 May||U||1.6 (0.1)||100||3|
Errors in parenthesis. a (1) Klare & Neckel (1977), mean of two measurements. It is not clear which broadband filter was used. We assumed optical V broadband for simplicity; (2) Barbier & Swings (1982), mean of five measurements and after taking into account an interstellar contribution; (3) Gnedin et al. (1992). The PA quoted is the mean value including all filters as reference.
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