Sector 22



× Warning for Sector 22: Four FFI cadences and two 2-minute cadences were lost due to computer issues. A ~2 second error in data product timestamps has been corrected for starting with Sector 22. Previous data products will be corrected as they are reprocessed.

Sector 22 Information

For full data release notes see: DRN31. For a list of TIC IDs with noted issues, see this list.

Updates:

  • The reported times for previous data products are too large by 2 seconds. This issue has been fixed for Sector 22 data products, which have updated and accurate timestamps.
  • Timestamps from previous sectors can be corrected by subtracting 2 seconds. Future data releases will include reprocessed data with corrected timestamps.
  • The start times of integrations for every 2 minute and 30 minute cadence have been shifted forward by 31 milliseconds, and the end times have been shifted forward by 11 milliseconds.
  • These offsets correct for effects in the focal plane electronics that were not accounted for in previous data releases. Until data is re-processed the times must be adjusted by adding correct values to headers.
  • Two-minute data products report the TJD at mid-exposure, and so should be corrected by adding 21 milliseconds to the timestamps.
  • Note that the correction only applies to the timestamps themselves; the reported exposure times in data product headers and flux values (electrons per second) are correct.

    • Sector Summary

  • Sector dates: February 19 to March 17 2020
  • Pointing: Northern hemispher
  • Days of Science Data Collection: 26.13
  • Days of Paused Data Collection: 1.07



    • Spacecraft Pointing (deg)

    RA dec roll
    Spacecraft 197.1 53.74 319.7
    Camera 1 172.75 22.78 65.49
    Camera 2 186.32 44.03 57.86
    Camera 3 213.72 61.95 215.57
    Camera 4 270.0 66.56 164.08



    Orbit Summary

    Orbits Dates (UTC)

    Start - End

    		 Cadence #

    Start - End

    		 Momentum dumps
    51 2020-02-19 - 2020-03-04 483729 - 493234 Every 6.625 days
    52 2020-03-05 - 2020-03-17 494001 - 503307 Every 6.75 days



    Sector Notes

    Noted Issue Description
    Spacecraft pointing Camera 1 and Camera 4 were both used for guiding in orbit 51; Camera 4 alone was used for guiding in orbit 52.
    Scattered light In Sector 22, the Earth is a significant source of scattered light at the start of both orbits. The Moon also passes through the field of view of Camera 1 at the start of orbit 52, saturating the detectors Camera 4 alone was used for guiding in orbit 52.
    Watchdog resets

    The instrument computer unexpectedly hung, most likely due to space radiation induced errors in the computer processor or memory, resulting in a quick reboot of the computer.

    There were three watchdog timer resets in Sector 22: on 2/29/20, 3/3/20, and 3/12/20.

    Besides introducing short gaps in the 2m cadence data, these resets resulted in the loss a total of four FFI cadences.

    Two 2-minute cadences are missing from TJD 1909.46004 to 1909.4642 (2/29/20), from TJD 1911.9267 to 1911.9309 (3/3/20), and from 1921.0560 to 1921.0602 (3/12/20).