2007/05/01 by J. H. Goebel · 1 citation
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Gamma-ray bursts and supernovae #Photometry (optics) #Physics #Star (game theory) #Stars #Stellar, planetary, and galactic studies #Variable star
paper · pdf · doi:10.1086/518618
openalex publication_date 2007/05/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
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.