1. You have observed the same star at two different zenith distances. The table lists numerical values of the flux from the star, in arbitrary units. In this problem, you first derive values for the photometric extinction coefficients from data taken at zenith distances of 20° and 50°, and then use these to predict the fluxes at z = 65°. U-band flux B-band flux V-band flux 10,000 20° 5,000 4,223 8,000 50° 7,247 9,460 65° (a) Use the data above to determine values for the extinction coefficients k, k, and ky. (b) Predict the expected fluxes in each band at z = 65°, based on the table and coefficients.

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