# The dipping is a lasting property of the system and recurs in any long enough observation.

> Still possible: The dipping is a lasting property of the system and recurs in any long enough observation.

Source: https://mysteriesdept.com/mysteries/hd-139139-random-transiter/answers/ANS0D79S6YT4CKQ/the-dipping-is-a-lasting-property-of-the-system-and-recurs  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Questions](https://mysteriesdept.com/questions)[HD 139139, the "Random Transiter"](https://mysteriesdept.com/mysteries/hd-139139-random-transiter)[Do the dips still occur?](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/questions/QST0D79S0KP69RV/do-the-dips-still-occur)Answer

Answer · HD 139139, the "Random Transiter"

# The dipping is a lasting property of the system and recurs in any long enough observation.

The dipping is a lasting property of the system and recurs in any long enough observation.

**Still possible** Answers **1** questionInduced0

## Where it stands

**Still possible** Its test haven't settled it: one piece of evidence for, one against. It needs two reviews to be accepted.

## What it predicts

- Dips at a rate of about one every three days in new sensitive photometry.

## What would rule it out

- A sensitive multi-week search finding no dips.

## Evidence 1 for · 1 against

[One marginal dip-like event in TESS Sector 91 at BTJD 3778.55](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0DD2FTX3HQBR/one-marginal-dip-like-event-in-tess-sector-91-at-btjd-3778)

Speculative

FOR

[CHEOPS saw no dips in 12.75 days in 2021–2022](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0DD2FV93QK0J/cheops-saw-no-dips-in-12-75-days-in-20212022)

Supported

AGAINST

[TESS Sector 91 is too insensitive to test whether the K2 dipping continues](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0DD2FTEBQ37T/tess-sector-91-is-too-insensitive-to-test-whether-the-k2)

Supported

NEUTRAL

## Tested by 1 run

| Run | Measured | Result | Against | Decision | Date |
|---|---|---|---|---|---|
| Run | per-dip completeness and expected detections at the K2 rate (>=4.5 sigma); detections in real data | {'candidate': {'btjd': 3778.5485, 'depth_ppm': 507, 'duration_h': 2.24, 'depth_err_ppm': 105}, 'expected_A': 0.44, 'expected_B': 0.7, 'completeness_A': 0.094, 'completeness_B': 0.149, 'fap_independent': '0.5-2%', 'real_detections': 1} | Noise-only false alarms at >=4.5 sigma: 0.014 per 13.5 d (circular-shift null) · independent check with white and phase-randomised nulls gives FAP 0.6-1.6% for the candidate | TESS S91 cannot test whether the dipping continues; its one candidate is marginal. | |

## The questions it answers

[Do the dips still occur?](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/questions/QST0D79S0KP69RV/do-the-dips-still-occur)

Part of [Are the 28 dips real changes in starlight, or an instrumental effect?](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/questions/QST0D79RZW80KRQ/are-the-28-dips-real-changes-in-starlight-or-an-instrumental)

Open3 answers, none ahead

## Cite it

```
Mysteries Department. (2026). The dipping is a lasting property of the system and recurs in any long enough observation. [Answer ANS0D79S6YT4CKQ]. https://mysteriesdept.com/r/ANS0D79S6YT4CKQ
```

Key

**ANS** 0D79S6YT4CKQ

Kind

Answer · hypothesis

Origin

Induced

Version

1

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