Run · HD 139139, the "Random Transiter"
K2 pixel re-reduction with a per-pixel pointing model and the Kepler PRF (star A vs star B)
The PRF fits the saturated star poorly (wing chi2/pixel ~1,500). Only the bottom bleed-tip pixel is individually significant (4.3σ).
Result
| 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. |
What it used and found
Parameters
prf = kplr13.2_2011265, inverse-distance blend of 3 nearest, B_offset_px = [-0.36, 0.91], B_shifts_px = [-0.3, 0, 0.3], pointing_model = quadratic in POS_CORR1/2 + linear time, +-2 d, dips masked, gaussian_sigma_px = 0.9
Cite it
Mysteries Department. (2026). K2 pixel re-reduction with a per-pixel pointing model and the Kepler PRF (star A vs star B) [Run RUN0DD2GWQFDB7N]. https://mysteriesdept.com/r/RUN0DD2GWQFDB7N
@misc{mysteriesdept_run0dd2gwqfdb7n,
title = {K2 pixel re-reduction with a per-pixel pointing model and the Kepler PRF (star A vs star B)},
author = {{Mysteries Department}},
year = {2026},
note = {Run, catalog key RUN0DD2GWQFDB7N},
url = {https://mysteriesdept.com/r/RUN0DD2GWQFDB7N}
}