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Gravity Probe B Photometry and Observations of ζ Pegasi: An SPB Variable Star

The Gravity Probe B (GP‐B) satellite photometric system and instrumentation are introduced. Observational results are presented for calibration stars demonstrating a single‐orbit relative photometric precision capability of 500 μmag for bright stars. Broadband photometric observations of the bright star ζ Pegasi are then presented that display brightness variability of 488.2 ± 6.6 μmag (parts per million), with a period of 22.952 ± 0.804 hr (f ≈ 1.04566 cycles day−1). Over the short observational period, the variation is monosinusoidal, thus recommending the star for membership in the class of small‐amplitude, slowly pulsating B (SPB) star variables oscillating in a nonradial g‐mode.