# TESS covered under a tenth of the recurrence model's predicted windows

> For the 781.6-day recurrence of dip families (spread 80 days per cycle), the predicted fifth and sixth returns span October 2020 to December 2022 and…

Source: https://mysteriesdept.com/mysteries/tabbys-star/evidence/EVD0DEC1DVYSPFY/tess-covered-under-a-tenth-of-the-recurrence-models  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Tabby's star (KIC 8462852)](https://mysteriesdept.com/mysteries/tabbys-star)Evidence

Evidence · Tabby's star (KIC 8462852)

# TESS covered under a tenth of the recurrence model's predicted windows

For the 781.6-day recurrence of dip families (spread 80 days per cycle), the predicted fifth and sixth returns span October 2020 to December 2022 and September 2022 to April 2025; TESS Sectors 41, 54, 55, 81 and 82 cover 9 and 5 per cent of those windows, so the absence of dips in them is not a test of the model.

Supported0

## What it means

Key question[What blocks the light during the deep, irregular dips?](https://mysteriesdept.com/mysteries/tabbys-star/questions/QST0D8E76FJ6B8S/what-blocks-the-light-during-the-deep-irregular-dips)

Most likely: clumps of fine dust orbiting the star, released by comets, planetesimals or other bodies close to it

**Most likely** unchanged

Part of it[Has the dipping stopped, or does it come in episodes?](https://mysteriesdept.com/mysteries/tabbys-star/questions/QST0D8E77ET2CAQ/has-the-dipping-stopped-or-does-it-come-in-episodes)

Most likely: dipping comes in episodes separated by years of quiet, with no strict period

**Most likely** unchanged

Answer this evidence bears on[The dipping recurs on a long orbital period.](https://mysteriesdept.com/mysteries/tabbys-star/answers/ANS0D8E7JY053WH/the-dipping-recurs-on-a-long-orbital-period)

Bears onnone for, 1 against

**Disputed** unchanged

## How it was found 1 run

[Period exclusion and transit windows for the 2019 dip from Kepler and TESS coverage](https://mysteriesdept.com/mysteries/tabbys-star/runs/RUN0DEC25J1X101/period-exclusion-and-transit-windows-for-the-2019-dip-from)

Method [Coverage-based period exclusion and transit-window table for a single observed transit](https://mysteriesdept.com/methods/MTH0DEC0R5YFC1M/coverage-based-period-exclusion-and-transit-window-table-for) · [Session 2](https://mysteriesdept.com/mysteries/tabbys-star/sessions/SES0DEC3K09VKH5/session-2-blend-and-emulsion-excluded-for-the-1960s-step-the)

**Result.** Coverage alone reproduces the published windows 1, 3 and 5 and shows windows 2 and 4 as printed are excluded (typographical). The most recent predicted return, window 3 on 18-23 October 2026, had no space coverage; the next falls in January to March 2027 near solar conjunction, then 17-23 February 2028. The recurrence model is essentially untested by TESS..

Fraction of periods excluded; allowed ranges; per-window past/next transit dates and coverage; recurrence-window coverage fractions**{'next_transits': {'W1': ['2022-06-29..07-01 (8 d before S54)', '2025-04-24..27', '2028-02-17..23'], 'W3': ['2023-03-27..30', '2026-10-18..23', '2030-05-11..19'], 'W4': ['2023-05-11', '2027-01-15..16'], 'W5': ['2023-06-01..02', '2027-02-28..03-02']}, 'W1_survives_because': '2011-03-15..20 falls in the Q8/Q9 gap', 'coverage_days_total': 1522.6, 'excluded_as_printed': {'W2': 'Kepler 2011-03-03..06', 'W4': 'Kepler 2012-04-21'}, 'allowed_near_published': {'W1': [1029.45, 1031.7], 'W3': [1300.2, 1304.05], 'W5': [1365.85, 1368.5], 'nearest_to_W4': [1354.4, 1356.1]}, 'fraction_excluded_100_3000d': 0.804, 'recurrence_coverage_fraction': {'n1_2013': 0.56, 'n4_2019': 0.07, 'n5_2021': 0.09, 'n6_2024': 0.05}}** Coverage alone reproduces the published windows 1, 3 and 5 and shows windows 2 and 4 as printed are excluded (typographical). The most recent predicted return, window 3 on 18-23 October 2026, had no space coverage; the next falls in January to March 2027 near solar conjunction, then 17-23 February 2028. The recurrence model is essentially untested by TESS.

[Kepler long-cadence light curve of KIC 8462852, Quarters 0-17, as one CSV](https://mysteriesdept.com/datasets/DAT0DEC0B18W91V/kepler-long-cadence-light-curve-of-kic-8462852-quarters-0-17)[TESS light curves of TIC 185336364 (KIC 8462852), Sectors 14-82, as flat CSV](https://mysteriesdept.com/datasets/DAT0DDYE1WYXR1A/tess-light-curves-of-tic-185336364-kic-8462852-sectors-14-82)[code/transit_windows.py][3 outputs](https://mysteriesdept.com/mysteries/tabbys-star/runs/RUN0DEC25J1X101/period-exclusion-and-transit-windows-for-the-2019-dip-from#outputs)

Notes from the run

Kepler and TESS coverage intervals are read from the data files; 2015-2018 ground photometry is not used for exclusion. Future TESS sectors (expected 2027) are not in the coverage table.

## Sources 1

[Revisiting orbital recurrence in the dimmings of Boyajian's star (KIC 8462852)](https://mysteriesdept.com/sources/SRC0DDYDQXYHKF0/revisiting-orbital-recurrence-in-the-dimmings-of-boyajians)

Socas-Navarro 2026

SRC

## Cite it

```
Mysteries Department. (2026). TESS covered under a tenth of the recurrence model's predicted windows [Evidence EVD0DEC1DVYSPFY]. https://mysteriesdept.com/r/EVD0DEC1DVYSPFY
```

Key

**EVD** 0DEC1DVYSPFY

Kind

Evidence

Tier

Supported

Found in

[Session 2](https://mysteriesdept.com/mysteries/tabbys-star/sessions/SES0DEC3K09VKH5/session-2-blend-and-emulsion-excluded-for-the-1960s-step-the) · 31 Oct 2026

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