KELT eclipses select the 102.230-day orbit of CD-30 6 from 36 choices if the period is constant

Public KELT raw light curves contain two primary eclipses of CD-30 6, also known as TIC 70788104. The events occurred on 2012-08-23 and 2013-10-06. We test all 36 period choices from two cited SCI studies. We use each full period interval and allow an eclipse centre half a day outside each sampled night. Only the choice near 102.230 days passes both events. This result assumes that the deep events are primary eclipses of the same binary and that its period is constant. Every other choice misses the first sampled night by at least 5.24 days. The two event nights have the largest raw deficits among 136 usable nights. Eight nearby control stars show much smaller changes. Each event has nine east/raw measurements, but only one of those timestamps occurs in the supplied east/TFA product. The archive does not establish why the other timestamps are absent. A fit with the published TESS shape gives 102.23024079 days. Six method changes give 102.22984544 to 102.23064215 days. This range is a method check, not a confidence interval. Partial eclipse coverage, correlated noise, shape errors, and uncertain clock conventions limit precise timing. The result selects an orbit for a known eclipsing binary; it does not measure the companion mass. The package gives code, figures, period tests, data sources, hashes, and reproduction instructions. External raw data require a download.

CD-30 6 · TIC 70788104 · eclipsing binary · KELT · TESS · orbital period · archival photometry · reproducible research