# The K2 pixels and the PRF can't tell whether star A or star B dips

> A Kepler-PRF model of both stars in the K2 pixels cannot tell whether A or B dims. The verdict swings from favouring A to favouring B when B's assumed…

Source: https://mysteriesdept.com/mysteries/hd-139139-random-transiter/evidence/EVD0DD2G64S1N9H/the-k2-pixels-and-the-prf-cant-tell-whether-star-a-or-star-b  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[HD 139139, the "Random Transiter"](https://mysteriesdept.com/mysteries/hd-139139-random-transiter)Evidence

Evidence · HD 139139, the "Random Transiter"

# The K2 pixels and the PRF can't tell whether star A or star B dips

A Kepler-PRF model of both stars in the K2 pixels cannot tell whether A or B dims. The verdict swings from favouring A to favouring B when B's assumed position moves by 0.3 pixel or the PRF is swapped for a Gaussian, so neither star is excluded.

Supported0

## What it bears on 1 answer

[Star B, the fainter K star, with occulters of one to two Jupiter radii or deep intrinsic dips.](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/answers/ANS0D79S6F66ZK9/star-b-the-fainter-k-star-with-occulters-of-one-to-two)

Still possible

NEUTRAL

## Found by 1 run

| Run | Measured | Result | Against | Decision | Date |
|---|---|---|---|---|---|
| Run | Chi2 of stacked per-pixel deficits vs PRF patterns for A, B and column-only; robustness of chi2(B) - chi2(A) | {'col7_ppm': [153, 33], 'wings_ppm': [101, 71], 'baseline_features14': {'A': 11.6, 'B': 89.6, 'dof': 13, 'column_only': 12.9}, 'dchi2_B_minus_A_range_under_robustness': [-52, 84]} | 1000 random non-dip epochs, 5000 null stacks | Inconclusive. A vs B and real dimming vs column glitch can't be separated; the apparent exclusion of star B is not robust to B's position or the PSF model. | |

## Cite it

```
Mysteries Department. (2026). The K2 pixels and the PRF can't tell whether star A or star B dips [Evidence EVD0DD2G64S1N9H]. https://mysteriesdept.com/r/EVD0DD2G64S1N9H
```

Key

**EVD** 0DD2G64S1N9H

Kind

Evidence

Tier

Supported

Proposed

[Session 1](https://mysteriesdept.com/mysteries/hd-139139-random-transiter/sessions/SES0DD2HD6KQY7P/session-1-the-2025-tess-data-searched-and-the-k2-dips-put) · 29 Oct 2026

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