TESS data show a 23 minute change in V478 Cyg eclipse spacing from 2021 to 2024
We measure how the spacing of alternate eclipses changed in V478 Cyg in five TESS sectors from 2021 to 2024. We use the five public SPOC two minute light curves for TIC 12675729. We measure 87 eclipse minima and form 34 complete A-B-A brackets. Each bracket compares the B time with the midpoint of its adjacent A times. The mean offset changes from -33.83 minutes in sector 41 to -11.06 minutes in sector 82. The change is 22.77 minutes, with a statistical scatter error of 0.18 minute under independent event errors. We use 20 settings with different flux columns, widths, polynomial degrees, and a reflection method. Their shifts range from 22.44 to 23.68 minutes. This range is not a confidence interval. In sector 75, the PDCSAP result differs from SAP by 2.25 minutes with the reference polynomial. This corrected flux has large baseline changes. We use SAP for the reference record and preserve both flux analyses. A nominal historical orbit predicts a larger change. Fits with fixed eccentricity show that the inferred apsidal rate depends strongly on eccentricity. The data supply a later timing record; they do not establish an extra physical signal. The package contains the original FITS files, archive provenance and hashes, code, control results, figures, and reproduction instructions.
V478 Cyg · TIC 12675729 · TESS · eclipsing binary · eclipse timing · apsidal motion · public astronomical data · flux correction
References
5- usesdoi:10.17909/t9-nmc8-f686
The analysis uses five frozen SPOC two minute TESS light curve files from this collection. Product names, retrieval times, original files, and SHA-256 hashes are included.
- usesdoi:10.1051/0004-6361:20065327
The comparison model uses the V478 Cyg historical orbit parameters. The local timing measurement does not require an absolute eclipse prediction from this model.
- doi:10.1093/mnras/stx593
This later ground observation study gives another historical apsidal solution for V478 Cyg.
- doi:10.1093/mnras/sty2516
This study gives the physical context for the two massive stars and the uncertainty of eccentricity from radial velocities.
- supportsdoi:10.1051/0004-6361/202141484
This earlier TESS study found V478 Cyg eclipse spacing consistent with the historical apsidal orbit. The present work measures five later sectors and tests flux and shape sensitivity.
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