× Sector 12 was reprocessed in May 2021, updating the background correction, manual exclude flags, timestamps, and input catalog. For more deatil please see the Reprocessing Information table below.

Sector 12 Information

For full data release notes see: DRN17, DRN42 (reprocessing). For a list of TIC IDs with noted issues, see this list.

Sector Summary

Sector dates: May 21 to June 18 2019

Pointing: Southern hemisphere

Days of Science Data Collection: 26.9

Days of Paused Data Collection: 1.04

Spacecraft Pointing (deg)

	RA	dec	roll
Spacecraft	229.59	-75.13	153.98
Camera 1	249.34	-40.26	261.51
Camera 2	241.52	-63.82	255.21
Camera 3	177.3	-83.38	12.37
Camera 4	90.01	-66.56	286.45

Orbit Summary

Orbits	Dates (UTC) Start - End	Cadence # Start - End	Momentum dumps
31	2019-05-21 - 2019-06-04	286196 - 296309	Every 3.125 days
32	2019-06-05 - 2019-06-18	297056 - 306314	Every 3.125 days

Sector Notes

Noted Issue	Description
Space Craft Pointing	Due to scattered light from the Earth Camera 1 was disabled and Camera 4 alone was used for guiding in all of orbit 31. This configuration causes the apparent pointing of Cameras 1, 2 and 3 to drift by larger amounts than in other sectors due to differential velocity aberration. The amplitude of the drift depends on each camera, and has a maximum value of 3 arc-seconds (0.14 pixels) in Camera 1 from the beginning to end of orbit 31. In orbit 32, both Camera 1 and Camera 4 were used for guiding for the entire duration of the orbit.
Scattered Light	In Sector 12, the main stray light features are caused by the Earth and Moon at the start of each orbit.

Reprocessing Information: DRN42

During TESS’s primary mission several updates were made to various instrument models, algorithms, and pipeline parameters. Below we list what was updated and applied when reprocessing sectors 1-13. Please see DRN42 for a more comprehensive explanation of each update.

Update	Description
Instrument models updated:	Electronics model Reference Flux, PRF, and Linearity
Calibration Pipeline Module updates:	The 1D bias estimate is now split into two components, a time-dependent scalar correction and a static row-dependent correction. The first two overclock rows were also removed. The propagation of the uncertainty from the 2D bias model was changed. It is a static term and no longer applied to pixel data.
Pre-Search Data Conditioning Pipeline Module updates:	The parameters to calibrate the PDC goodness metrics were finalized.
Transiting Planet Search Pipeline Module updates:	An initial run of TPS is now used to identify problematic epochs that are assigned “deemphasis weights” in a second and final run of TPS.
Compute Optimal Aperture Pipeline Module updates:	The photometric apertures for stars with Tmag less than 11 were slightly increased.
Photometric Analysis Pipeline Module updates:	The sky background estimate was modified. A scalar offset is now applied that forces the dimmest background-corrected pixels to values near zero, if those pixels were significantly negative.
TESS Input Catalog update:	Targets were reprocessed with version 8 of the TIC. The change affected the apertures assigned to individual targets and the calculations for crowding (CROWDSAP) and flux fraction (FLUXFRAC), and as such the physical properties of TCEs derived from stellar parameters.
Timestamps update:	Timestamps were updated to account for previous drift errors and electronic effects. All data from Sectors 1–36 are now registered to a consistent time system.
New data flags:	All flags are now consistent with those described in DRN30.
Threshold Crossing Event issues:	The planet search of the reprocessed light curves produced a different set of TCEs from the original processed data. There is a high degree of overlap, but not every TCE from previous data releases was recovered. To differentiate between the initial release and this reprocessed data a "pipeline instance number" is included in the filenames of the dv-timeseries, dv-reports, ad dv-result xml files. Larger pin numbers indicate later versions of the software were used to produce the data products. The DR number is also included as a keyword in the export product headers (DATA_REL).