{
  "abstract": "HD 158485 is an A-type δ Scuti star in the CALSPEC network and the JWST absolute-flux calibration program. Gaia DR3 assigns it a binary classification probability close to unity but provides no orbital solution. Using TESS observations from Sectors 14–26, 40–41, 47–60, and 73–86, we measure the pulsation phases of six δ Scuti modes. The frequencies form two groups with opposite light-travel-time delays, revealing two pulsating components. A direct light-curve forward model yields an orbital period of P orb = 382.8 0 − 0.76 + 0.80 days, eccentricity e = 0.24 2 − 0.046 + 0.045 , projected light-time amplitudes of 195 . 8 − 8.9 + 9.2 and 239 . 7 − 6.8 + 6.8 s, and a dynamical mass ratio of q = M B / M A = 0.81 8 − 0.045 + 0.046 . A blind prediction based only on the first two long TESS campaigns reproduces the third campaign without updating the orbital parameters, with a Pearson correlation coefficient of r = 0.983. Its held-out rms is 83.8 s, compared with 289.9 s when the period is fixed at 365.25 days. A 5.15 σ Hipparcos–Gaia EDR3 proper-motion anomaly independently indicates unresolved astrometric motion. The unresolved companion can also affect spectrophotometric predictions: a conditional double-pulsator-binary (PB2)-constrained two-atmosphere model differs from the corresponding single-star atmosphere prediction by 1.6% over 1–5 μ m and 2.5% over 5–28 μ m. HD 158485 therefore shows that a calibration-relevant binary can lack a catalogued orbital solution while two independent pulsation clocks reveal and measure its orbit.",
  "abstract_shown": true,
  "affiliations": [
    "Chinese Academy of Sciences",
    "Instituto de Astrofísica de Andalucía—CSIC",
    "University of Chinese Academy of Sciences",
    "Chinese Academy of Sciences South America Center for Astronomy",
    "Xinjiang University"
  ],
  "article_type": null,
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  "author_total": 8,
  "authors": [
    {
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        0,
        1
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      "name": "Chenglong Lv",
      "orcid": "0000-0001-6354-1646"
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    {
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        2
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      "name": "Ali Esamdin",
      "orcid": "0000-0003-1845-4900"
    },
    {
      "affs": [
        0
      ],
      "name": "Shuguo Ma",
      "orcid": "0000-0001-5066-5682"
    },
    {
      "affs": [
        0,
        2
      ],
      "name": "Shahidin Yaqup",
      "orcid": "0000-0001-8677-2391"
    },
    {
      "affs": [
        3
      ],
      "name": "Haozhi Wang",
      "orcid": "0000-0002-2463-4943"
    },
    {
      "affs": [
        0,
        2
      ],
      "name": "Ayzada Jmahali",
      "orcid": "0000-0001-9600-963X"
    },
    {
      "affs": [
        0,
        2
      ],
      "name": "Jianwei Yao",
      "orcid": "0009-0000-2772-2677"
    },
    {
      "affs": [
        4
      ],
      "name": "Kedieryemu Kamili",
      "orcid": "0009-0008-7094-1304"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7gfs5w2pca2fk.bib",
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  "doi": "10.3847/2041-8213/aeb301",
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  "issns": [
    "2041-8213",
    "2041-8205"
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  "licence_label": "CC BY 4.0",
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  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
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      "3103|Stellar, planetary, and galactic studies"
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  "pdf_url": "https://iopscience.iop.org/article/10.3847/2041-8213/aeb301/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-27",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/7gfs5w2pca2fk.ris",
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      "first_seen": "2026-10-30T12:17:17Z",
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  "title": "TESS Pulsation Timing Reveals the JWST Calibration Star HD 158485 as a Double-pulsator Binary",
  "title_text": "TESS Pulsation Timing Reveals the JWST Calibration Star HD 158485 as a Double-pulsator Binary",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:13Z",
  "url": "https://research.draconitic.com/paper/7gfs5w2pca2fk",
  "venue": "The Astrophysical Journal Letters",
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      "relation": "preprint",
      "title": "TESS Pulsation Timing Reveals the JWST Calibration Star HD 158485 as a Double-pulsator Binary",
      "venue": "arXiv"
    }
  ]
}