TrES-2 / KIC 11446443 — Kepler Q1 DR25 teaching subset
The Last Transmission / DarkScienceDocs.com
Activity: https://darksciencedocs.com/light-lab/exoplanet-transits/
Source retrieved: 2026-10-24; interface notes updated 2026-10-24

NASA Kepler observations archived at MAST/STScI. Retrieved from the
STScI-managed public Kepler mirror listed at:
https://registry.opendata.aws/mast-kepler/
Original file URL: https://stpubdata.s3.amazonaws.com/kepler/public/lightcurves/0114/011446443/kplr011446443-2009166043257_llc.fits
Original FITS SHA-256: 10bfca91bdd928deda2e638de7a27cdc940b879452408a96b5be6146944639e9
All three FITS HDU checksums verified; the local FITS is unchanged.

Original product: kplr011446443-2009166043257_llc.fits
KIC 11446443; Kepler Quarter 1; Data Release 25; long cadence.
Header date interval: 2009-05-13T00:01:07.136Z through 2009-06-15T11:47:40.562Z.
Cadence spacing: 29.42438143 minutes (averaged photometry).
TIME is BKJD = BJD_TDB - 2454833, in days. Not a local calendar date.

PROCESSING
1639 original rows. Remove 15 nonfinite/missing or nonpositive required
values (TIME, PDCSAP_FLUX, PDCSAP_FLUX_ERR), then 214 nonzero SAP_QUALITY
rows. Retain 1410 observations. This conservative zero-quality mask is a
teaching choice, not the only appropriate scientific mask.
PDCSAP already includes mission pipeline corrections. It is not raw data.
Normalize flux and its error by the retained median 403696.25
electrons/second. No additional detrending, clipping, smoothing,
interpolation, gap filling, or simulated transit injection.
CSV time and normalized values are rounded to nine decimal places;
original flux/error values are retained as decoded FITS floats.
Cadence numbers preserve traceability. Every retained SAP_QUALITY is zero.

NAVIGATION AND MEASUREMENTS
Group normalized flux <0.996; split after a gap >0.2 days. The group's
flux-deficit weighted mean time supplies a rough navigation center.
These 14 groups are navigation aids, not a vetted search pipeline.
Depth = 1 - median(central flux)/median(baseline flux).
Central half-width is fixed at 0.5 hours in the simplified release259 interface.
Baseline samples: absolute time difference 2.5 to 5.5 hours either side.
Require >=2 central and >=6 baseline samples. No formal fit uncertainties.
Approximate radius ratio = sqrt(positive fractional depth), assuming a
complete undiluted transit and uniform stellar brightness. This is not a
professional fit for TrES-2, whose geometry/limb darkening/cadence matter.
Period = (time B - time A)/number of orbital intervals.
Phase = ((time - origin + period/2) modulo period) - period/2.
Origin: 132.6421816 BKJD (opening navigation center).
All phase plots use the same retained points, without new observations.
Historical comparison: 2.47063 days, O'Donovan et al. (2006),
https://arxiv.org/abs/astro-ph/0609335
Not an updated catalog solution. No mass, atmosphere or habitability fit.

REUSE AND CREDIT
The public Kepler mirror lists mission data as public domain.
Acknowledge NASA Kepler and MAST/STScI and preserve these processing notes.
The Last Transmission prepared this teaching selection and interface;
we did not collect the observations or discover TrES-2 b. This is not an
official NASA/STScI product or endorsement.

DOCUMENTATION
https://archive.stsci.edu/missions-and-data/kepler
https://archive.stsci.edu/kepler/manuals/archive_manual.pdf
https://spacetelescope.github.io/mast_notebooks/notebooks/Kepler/lightkurve_analyzing_lc_products/lightkurve_analyzing_lc_products.html

SIMPLIFIED INTERFACE (release259)
Choose Inspect dip, Stack transits, or Full record. Only one chart is shown
at a time. Depth-window half-width is fixed at0.5hour; its center can move.
In Stack transits, select two of the14consecutive dips. Interval count is
their index difference, not the number of displayed sample rows. A later
dip must follow the first. Stack selected dips applies that timing estimate
to the SAME adjacent chart. No fitted mid-transit times or formal errors.
Show uncertainties draws the supplied errors in amber, enlarged20times
for visibility, with an explicit notice and actual normalized ppm range.
Only drawn bar lengths change; dot positions, data and calculations do not.
The bars show pipeline errors, not all systematic uncertainty.
The original256CSV/FITS downloads and SHA256 remain unchanged.