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astro-ph.IM · Instrumentation and Methods for Astrophysicsastro-ph.EP · Earth and Planetary Astrophysics

Archived QLP and TESS-SPOC times differ by up to 597 seconds for 16 stars per sector in TESS Sectors 14 and 15

We test relative time fields in archived QLP version 01 and TESS-SPOC version 1 light curves. A fixed rule selects one star in each of 16 camera and detector cells per sector in TESS Sectors 14 through 26. The sample has 208 star and sector pairs, 164 distinct stars, 416 source FITS files, and 246,936 finite exposure matches. We match native integer exposure labels. QLP minus TESS-SPOC time ranges from -553.023 to +503.417 seconds in Sector 14 and from -596.695 to +523.752 seconds in Sector 15. Large differences remain when both quality flags are zero. All tested differences in Sectors 16 through 26 lie between +1.914320 and +1.982257 seconds. At each common exposure label, eight stars fit a model based on sky direction and eight excluded stars test it. Three sky terms plus a constant give test RMS of 0.039329 second in Sector 14 and 0.468472 second in Sector 15 when all paired quality flags are zero. The added constant improves Sector 14 but worsens Sector 15. This extends a known one-star discrepancy to a fixed detector sample; it does not establish a cause, absolute clock error, or correction for other stars. All comparisons use the archived time conventions. The package contains every source FITS file, source hashes, native extracts, code, figures, and offline instructions. A separate FITS reader checked 2,021,472 column values. A clean offline run reproduced the numerical results.

TESS · QLP · TESS-SPOC · astronomical time · barycentric time · data validation · exposure labels · reproducible research

Admitted 1 citing publication

References

6
  1. usesSix 2019 QLP time stamps for KIC 9832227 are 3.0 to 5.1 minutes early under archived time conventions sci:sha256:449005526b19ba58b34dfb6ad03fd84fd28852b63fd8b8cda187f3b2ea6e90bb

    Its exact image checks for KIC 9832227 in Sectors 14 and 15 motivated this fixed sample across detectors and later control sectors. We extend its tested scope. We do not reuse its source data or code.

  2. usesQLP–SPOC time differences reach 498 seconds and follow a sky model in a sample from TESS sectors 99–104 sci:sha256:fda43265575f6f4331d3b819b93fc9a3d26e2a688bf5fd789cc3bbb3f426db5d

    We use its general method of exposure labels and a model based on sky direction, with separate fit stars and test stars. We apply the method to Sectors 14 through 26. We do not reuse its source code or numerical data.

  3. usesdoi:10.17909/t9-r086-e880

    Source of the 208 QLP version 01 light curves. Exact files and hashes are in the package.

  4. usesdoi:10.17909/t9-wpz1-8s54

    Source of the 208 TESS-SPOC version 1 light curves. Exact files and hashes are in the package.

  5. doi:10.48550/arXiv.2011.06459

    Describes the QLP light curve products.

  6. doi:10.48550/arXiv.2011.05495

    Describes the TESS-SPOC full frame image target products.

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