Sector 27



× Warning for Sector 27 (September 2020): This is the first data release for the extended mission. Key changes have occurred including the collection of 10-min FFI data instead of 30-min, and 20-second target pixel files.
  • The background correction was updated for the extended mission, with the new method providing improved results for fainter and crowded stars.
  • For targets observed in both Year 1 and Year 3, Year 3 processing was done using TIC 8.1 while TIC 7 was used for Year 1 processing; this may result in differences in results for certain targets.

Sector 27 Information

For full data release notes see: DRN38. For a list of TIC IDs with noted issues, see this list.

Updates:

This is the first data release for the extended mission

  • FFI data is collected every 10 min, rather than 30.
  • Selected pixel stamps are collected at a 20-sec cadence.
  • Data products for the 20 second mode have the keyword "fast" in the file names.
  • For 20-second data, only target pixel files, light curve files, collateral pixel files, and co-trending basis vectors (CBVs) were produced.
  • As usual cosmic rays were mitigated in the 2-minute cadence data and 10-minute FFIs by an algorithm running on the instrument firmware - see DRN pg. 8, for more info. Note however, that in the new 20-second pixel data cosmic rays were identified and removed in the pipeline, and that they can be restored in the pixel data and light curves if necessary.
  • The background correction employed throughout the primary mission was updated for the extended mission. The new method provides improved results for fainter and crowded stars. The correction is applied only to 2-min and 20-sec data. A full explanation of this correction is on pg. 10 of the DRN
  • For targets observed in both Year 1 and Year 3, Year 3 processing was done using TIC 8.1 while TIC 7 was used for Year 1 processing; this may result in different results for certain targets. Differences for some crowded and/or dim targets may also result from the background correction algorithm update (see below). Reprocessing of Year 1 data with TIC 8.1 and the latest codebase is underway at the SPOC, as of Fall 2020.
  • The algorithm in the CAL module that propagates uncertainty from the 2D bias model was changed. This uncertainty is a static term and is no longer applied to the pixel data or subsequent processing in the pipeline.
  • The algorithm in the PA module that estimates the sky background was changed. A scalar offset is now applied that forces the dimmest background-corrected pixels to values near zero, if those pixels were significantly negative.

    • Sector Summary

  • Sector dates: July 5 to July 30 2020
  • Pointing: Southern hemisphere
  • Days of Science Data Collection: 23.35
  • Days of Paused Data Collection: 1.02



    • Spacecraft Pointing (deg)

    RA dec roll
    Spacecraft 326.85 -72.43 214.51
    Camera 1 301.6 -38.68 282.66
    Camera 2 312.45 -61.74 291.17
    Camera 3 8.6 -79.81 165.21
    Camera 4 90.01 -66.56 244.53



    Orbit Summary

    Orbits Dates (UTC)

    Start - End

    		 Cadence #

    Start - End

    		 Momentum dumps
    61 2020-07-05 - 2020-07-17 582349 - 590884 1
    62 2020-07-18 - 2020-07-30 591619 - 599894 1



    Sector Notes

    Noted Issue Description
    Spacecraft pointing Year 3 is a re-observation of the southern ecliptic hemisphere, which will take place over 13 sectors. The pointing strategy is the same as for Year 1, except the locations of Sectors 27–39 are offset in ecliptic longitude with respect to Sectors 1–13. All sectors in Year 3 are planned for a spacecraft pointing of −54 degrees in ecliptic latitude.
    Scattered light In Sector 27, the Earth is a significant source of scattered light throughout both orbits.