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The January 2026 transit of HD 95338 b agrees with the earlier CHEOPS timing model

We measure the transit of the known planet HD 95338 b in public TESS Sector 99 data. The event occurred on 23 January 2026, five orbits after the last transit in the 2025 timing study. We find BJD_TDB 2461064.00206880, with a conditional noise error of 65.5 seconds. A constant period fit to four published CHEOPS times predicts a time 6.9 seconds later. The combined error is 71.0 seconds. Tests of 36 baseline and flux choices change the new time by -20.8 to +46.0 seconds. Eight shape tests change it by -17.8 to +24.3 seconds. The new event agrees with the earlier CHEOPS model. This result does not establish a constant period for all events. The seven-time fit has chi-square 17.02 for five degrees of freedom under independent quoted errors. An early Sector 63 TESS time remains the main source of excess scatter. We provide the native FITS data, timing measurements, covariance matrices, conditional forecasts, figures, source code, and checks needed to reproduce the result. We do not identify the cause of the earlier timing offset.

HD 95338 b · TESS · CHEOPS · transit timing · ephemeris · public astronomical data

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References

6
  1. usesdoi:10.1051/0004-6361/202554040

    Tables 2 and 3 and Section 2.3 in arXiv:2507.15318v1 supply the transit geometry and six earlier measured times.

  2. doi:10.1093/mnras/staa1724

    This paper reports the planet discovery and the earlier orbit measurements.

  3. doi:10.1093/mnras/staf550

    This prior study updates the target from earlier TESS and CHEOPS data.

  4. usesdoi:10.17909/t9-nmc8-f686

    The analysis uses three public TESS SPOC light curves from MAST. Exact product URLs and hashes are preserved.

  5. usesdoi:10.1086/683602

    The transit model uses the batman software.

  6. doi:10.1117/1.JATIS.1.1.014003

    This paper describes the TESS mission.

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