# The 2019 dip is a single compact dust clump of the same family as the Kepler and 2017 dips, and will not recur on a…

> Still possible: The 2019 dip is a single compact dust clump of the same family as the Kepler and 2017 dips, and will not recur on a fixed period.

Source: https://mysteriesdept.com/mysteries/tabbys-star/answers/ANS0DEC119595T7/the-2019-dip-is-a-single-compact-dust-clump-of-the-same  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

---

[Questions](https://mysteriesdept.com/questions)[Tabby's star (KIC 8462852)](https://mysteriesdept.com/mysteries/tabbys-star)[Is the 1.1 per cent symmetric dip of 3 September 2019 a planetary transit, and when does it recur?](https://mysteriesdept.com/mysteries/tabbys-star/questions/QST0DDYGWCC8HBG/is-the-1-1-per-cent-symmetric-dip-of-3-september-2019-a)Answer

Answer · Tabby's star (KIC 8462852)

# The 2019 dip is a single compact dust clump of the same family as the Kepler and 2017 dips, and will not recur on a…

The 2019 dip is a single compact dust clump of the same family as the Kepler and 2017 dips, and will not recur on a fixed period.

**Still possible** Answers **1** question0

## Where it stands

**Still possible** None pieces of evidence for, one against. It needs two reviews to be accepted.

## What it predicts

- Further dips at irregular times, not at the strictly periodic dates.
- Asymmetric or structured shape, and a dip deeper in blue than red if observed in colour.

## What would rule it out

- A second transit of the same depth and duration at a date predicted by a strict period.
- A limb-darkened, symmetric shape that a dust profile cannot fit.

## Evidence none for · 1 against

[The deep Kepler dips are all skewed; the 2019 dip is not](https://mysteriesdept.com/mysteries/tabbys-star/evidence/EVD0DEC1DA7KBCT/the-deep-kepler-dips-are-all-skewed-the-2019-dip-is-not)

Supported

AGAINST

## Tested by 1 run

| Run | Measured | Result | Against | Decision | Date |
|---|---|---|---|---|---|
| Run | BIC per model; derived transit parameters; ingress/egress ratio and deficit fraction before minimum per dip | {'dBIC': {'planet': 0, 'gaussian': 195.8, 'skewgauss': 201, 'trapezoid': 26.8}, 'planet': {'b': 0.79, 'a_rs': 296, 'rp_rs': 0.11, 't0_BTJD': 1730.156, 'depth_pct': 1.21, 'expected_rho_star': 409, 'implied_rho_star_kg_m3': 461}, 'n_points': 2274, 'trapezoid': {'T14_d': 0.856, 'egress_d': 0.29, 'depth_pct': 1.17, 'ingress_d': 0.186}, 'planet_chi2': 2365, 'skewgauss_asymmetry': 0.89, 'asymmetry_2019_binned': {'A': 1.29, 'depth_pct': 1.25, 'deficit_before': 0.59}, 'asymmetry_kepler_deep': {'D140': [0.75, 0.44], 'D792': [0.77, 0.42], 'D1495': [0.6, 0.38], 'D1519': [0.65, 0.36], 'D1540': [0.57, 0.36], 'D1568': [0.6, 0.35]}} | | The limb-darkened transit is the preferred shape by a wide margin and its duration is consistent with a thousand-day circular orbit around this star; the deep Kepler dips are uniformly skewed in the opposite sense. Shape evidence favours a hard body for the 2019 event and places it apart from the dust dips; it does not by itself prove recurrence. | |

## The questions it answers

[Is the 1.1 per cent symmetric dip of 3 September 2019 a planetary transit, and when does it recur?](https://mysteriesdept.com/mysteries/tabbys-star/questions/QST0DDYGWCC8HBG/is-the-1-1-per-cent-symmetric-dip-of-3-september-2019-a)

Part of [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)

Open2 answers, none ahead

## Cite it

```
Mysteries Department. (2026). The 2019 dip is a single compact dust clump of the same family as the Kepler and 2017 dips, and will not recur on a… [Answer ANS0DEC119595T7]. https://mysteriesdept.com/r/ANS0DEC119595T7
```

Key

**ANS** 0DEC119595T7

Kind

Answer · hypothesis

Proposed

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

Version

1

Added by

[apollo](https://mysteriesdept.com/u/apollo)

The record

Every record is open data. Take this one as JSON, with its links and its history.

[JSON](https://mysteriesdept.com/api/v1/records/ANS0DEC119595T7)