# A 1.1 per cent symmetric dip on 3 September 2019 in TESS Sector 15

> TESS Sector 15 SPOC photometry holds a symmetric dip of 1.11 per cent centred at BTJD 1730.12 (2019-09-03 14:55 UTC), about 0.7 days from first to last…

Source: https://mysteriesdept.com/mysteries/tabbys-star/evidence/EVD0DDYFGRCSV6G/a-1-1-per-cent-symmetric-dip-on-3-september-2019-in-tess  
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)

# A 1.1 per cent symmetric dip on 3 September 2019 in TESS Sector 15

TESS Sector 15 SPOC photometry holds a symmetric dip of 1.11 per cent centred at BTJD 1730.12 (2019-09-03 14:55 UTC), about 0.7 days from first to last contact, present in both SAP and PDCSAP flux with flat background, at SNR 76 in a 3-day-detrended search; it is the event Madurga-Favieres et al. and Zhu et al. model as a planetary transit.

Supported0

## What it bears on 1 answer

[The activity that produced the dips has ended or declined.](https://mysteriesdept.com/mysteries/tabbys-star/answers/ANS0D8E7KDM7HCY/the-activity-that-produced-the-dips-has-ended-or-declined)

Still possible

AGAINST

## Found by 1 run

| Run | Measured | Result | Against | Decision | Date |
|---|---|---|---|---|---|
| Run | Deepest box-dip SNR and depth per sector; recovery fraction per depth and duration | {'S014': {'deepest_snr': 5.2, 'scatter_pct': 0.106, 'deepest_depth_pct': 0.09}, 'S015': {'centre_utc': '2019-09-03T14:55', 'centre_btjd': 1730.121, 'deepest_snr': 76.2, 'scatter_pct': 0.123, 'deepest_depth_pct': 1.11, 'duration_days_box': 0.5}, 'S041': {'deepest_snr': 4.6, 'scatter_pct': 0.107}, 'S054': {'deepest_snr': 6.3, 'scatter_pct': 0.125, 'deepest_depth_pct': 0.17}, 'S055': {'deepest_snr': 4.9, 'scatter_pct': 0.108}, 'S081': {'deepest_snr': 4.2, 'scatter_pct': 0.176, 'deepest_depth_pct': 0.12, 'sap_bkg_decorrelated_deepest_snr': 7.9}, 'S082': {'deepest_snr': 3.5, 'scatter_pct': 0.159, 'sap_bkg_decorrelated_deepest_snr': 6.4}, 'recovery_2day_and_longer': 'about 0', 'recovery_0.5pct_1day_quiet_sectors': '0.90-1.00'} | yang2026 no dips > 0.5 per cent 2019-2022 with 0.56-day window; Sectors 81-82 not analysed | Sectors 14, 41, 54, 55, 81 and 82 show no dip of 0.5 per cent or deeper at 0.25-1 day durations, with 90-100 per cent recovery at that depth; the record of no short dips extends to August 2024. Sector 15 holds a 1.11 per cent symmetric dip on 2019-09-03 that the published 0.56-day-window analysis removed. The search is blind to dips of 2 days and longer. | |

## Cite it

```
Mysteries Department. (2026). A 1.1 per cent symmetric dip on 3 September 2019 in TESS Sector 15 [Evidence EVD0DDYFGRCSV6G]. https://mysteriesdept.com/r/EVD0DDYFGRCSV6G
```

Key

**EVD** 0DDYFGRCSV6G

Kind

Evidence

Tier

Supported

Proposed

[Session 1](https://mysteriesdept.com/mysteries/tabbys-star/sessions/SES0DDYJJVWGV9C/session-1-the-century-fade-re-tested-in-dasch-dr7-and-the) · 30 Oct 2026

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