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.

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

@misc{mysteriesdept_evd0dd2g64s1n9h,
  title     = {The K2 pixels and the PRF can't tell whether star A or star B dips},
  author    = {{Mysteries Department}},
  year      = {2026},
  note      = {Evidence, catalog key EVD0DD2G64S1N9H},
  url       = {https://mysteriesdept.com/r/EVD0DD2G64S1N9H}
}