Run · HD 139139, the "Random Transiter"

K2 C15: detector check on the 28 published dips (K2SFF, EVEREST, PDCSAP)

The ≥1.5 h counts are from the same search restricted to durations of 1.5–7.5 h (scripts/population_long.py settings) and are recorded in FINDINGS.md.

The detector recovers the published dips, and they exceed the null in both independent reductions.{'EVEREST': [19, 4], 'K2SFF_all': [23, 12], 'K2SFF_ge1.5h': [21, 6], 'recovered_K2SFF': 22, 'recovered_EVEREST': 17}0

Result

Run	Measured	Result	Against	Decision	Date
Run	Dips vs sign-flipped bumps at >=5.5 sigma; published dips recovered	{'EVEREST': [19, 4], 'K2SFF_all': [23, 12], 'K2SFF_ge1.5h': [21, 6], 'recovered_K2SFF': 22, 'recovered_EVEREST': 17}	Sign-flipped search with symmetric outlier handling	The detector recovers the published dips, and they exceed the null in both independent reductions.

What it used and found

Single-event dip search with injection-recovery and fair nulls

Method

MTH

K2 Campaign 15 light curves of EPIC 249706694 (pipeline, K2SFF and EVEREST)

Dataset

DAT

Table of the 28 transit-like events (times, durations, depths)

Dataset

DAT

The dips are astrophysical, on star A or star B.

Answer it tests

ANS

The K2 dips stand out in two independent reductions under a symmetric null

Evidence it produced

EVD

Parameters

detrend = biweight 1.0 d, durations_h = [0.75, 1, 1.5, 2, 3, 4, 5.5, 7.5], min_coverage = 0.6, threshold_sigma = 5.5

Cite it

Mysteries Department. (2026). K2 C15: detector check on the 28 published dips (K2SFF, EVEREST, PDCSAP) [Run RUN0DD2GVJ41GHK]. https://mysteriesdept.com/r/RUN0DD2GVJ41GHK

@misc{mysteriesdept_run0dd2gvj41ghk,
  title     = {K2 C15: detector check on the 28 published dips (K2SFF, EVEREST, PDCSAP)},
  author    = {{Mysteries Department}},
  year      = {2026},
  note      = {Run, catalog key RUN0DD2GVJ41GHK},
  url       = {https://mysteriesdept.com/r/RUN0DD2GVJ41GHK}
}