Sector 91



Sector 91 Information

Sector Summary

  • Sector dates: Apr 09 to May 07 2025
  • Pointing: Ecliptic
  • Days of Science Data Collection: 23.11
  • Days of Paused Data Collection: 0.59


  • Spacecraft Pointing (deg)

    RA dec roll
    Spacecraft 227.04 -16.87 254.27
    Camera 1 192.45 -4.72 337.56
    Camera 2 215.17 -13.3 341.17
    Camera 3 239.32 -19.75 168.14
    Camera 4 264.9 -22.79 177.56



    Orbit Summary

    Orbits Dates (UTC)

    Start - End

    Cadence #

    Start - End

    Momentum dumps
    189a 2025-04-09 - 2025-04-16 1834438 - 1839499 1
    189b 2025-04-17 - 2025-04-23 1839651 - 1844497 1
    190a 2025-04-23 - 2025-04-30 1844618 - 1849409 1
    190b 2025-04-30 - 2025-05-07 1849561 - 1854217 1

    Sector Notes

    Noted Issue Description
    Loss of Guiding: Data collection was paused during a 3.78-day contingency period, which resulted from a loss of guiding as the Earth passed through one of the satellite’s star-tracker cameras (cadences:1839737 - 1842464)
    Spacecraft pointing: The pointing in Sector 91 was set at 0.7 degrees in ecliptic latitude. The four science cameras were oriented along the Ecliptic Plane. Camera 4 was used for guiding in Orbits 189a, 189b, and 190a. During Orbit 189b, the Earth passed through Camera 4 making pointing unstable at times. Camera 1 was used for guiding in Orbits 189b, 190a, and 190b.
    Scattered light: In Sector 91, the Earth introduces scattered light signals in all Cameras 4 towards the end of orbits 189b and 190b. The Moon impacts all Cameras in orbit 189, and towards the end of orbit 190b.