A fixed shape model gives early dip times for Sigma Orionis E in TESS Sector 98 relative to the nominal 2022 clock

We test the nominal rotation clock printed in 2022 for Sigma Orionis E with public TESS data. The main data are QLP raw flux in Sectors 6, 32, and 98. A fixed dip shape comes from Sector 32 SPOC data. With the phase reference set by Sector 32, the two dips in Sector 98 occur 290 ± 28 seconds and 269 ± 48 seconds early. These errors describe scatter between accepted cycles. They exclude clock errors and changes in dip shape. All six tested local models retain an early phase. Three image sums with the same quality mask agree with QLP to within 23 seconds. A constant-period forecast from the two early sectors gives late residuals of −104 and +180 seconds. Both 95 percent cycle bootstrap intervals contain zero. The text and table of the clock source give different period errors, and no parameter covariance is supplied. Thus these data measure an offset from the nominal clock, but do not establish a change in stellar braking. The package contains original light curves, late dip times, image sums, source records, code, figures, and reproduction instructions.

Sigma Orionis E · HD 37479 · TIC 11286209 · TESS Sector 98 · rotation timing · magnetic stars · stellar braking · public data