{
  "abstract": "We have detected for the first time the redshifting and blueshifting of X-ray photons due to the orbital motion of an X-ray telescope around the Earth. Current and planned X-ray telescopes like XRISM/Resolve and NewAthena can achieve energy resolutions R = E /Δ E ≈ 1000, requiring spectroscopic calibration of physical effects such as the local standard of rest and the orbit of the Earth around the Sun. We construct an a priori method for detecting a heretofore unexamined effect: the modulation of redshift due to the motion of an X-ray telescope around the Earth. We apply this pipeline to several XRISM/Resolve observations of narrow Fe K α emission lines from Galactic center molecular clouds, and we detect evidence of orbital redshift modulation in the Fe K α emission at the 95% confidence level. Our findings suggest that orbital redshift modulation is already present and detectable in X-ray data and motivate reexamination of how X-ray photon data are packaged in the emerging era of high-resolution X-ray spectroscopy.",
  "abstract_shown": true,
  "affiliations": [
    "Department of Physics and Astronomy Michigan State University"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 2,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Stephen DiKerby",
      "orcid": "0000-0003-2633-2196"
    },
    {
      "affs": [
        0
      ],
      "name": "Shuo Zhang",
      "orcid": "0000-0002-2967-790X"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3sn99rfs41yrm.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/aeaa50",
  "fulltext_url": null,
  "id": "3sn99rfs41yrm",
  "issns": [
    "1538-4357",
    "0004-637X"
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  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aeaa50",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
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      "feed-journal",
      "astronomy/general"
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  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aeaa50/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-29",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/3sn99rfs41yrm.ris",
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      "first_seen": "2026-10-30T12:17:17Z",
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  "subjects": [
    {
      "field": "astronomy",
      "origin": "journal-openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "First Detection of the Doppler Shift of X-Ray Photons Due to a Telescope’s Orbital Motion",
  "title_text": "First Detection of the Doppler Shift of X-Ray Photons Due to a Telescope’s Orbital Motion",
  "type": "peer-reviewed",
  "updated_at": "2026-10-31T00:20:43Z",
  "url": "https://research.draconitic.com/paper/3sn99rfs41yrm",
  "venue": "The Astrophysical Journal",
  "versions": [
    {
      "doi": "10.48550/arxiv.2609.36042",
      "pid": "a624a9eqshm8j",
      "relation": "preprint",
      "title": "First Detection of the Doppler Shift of X-ray Photons Due to a Telescope's Orbital Motion",
      "venue": "arXiv"
    }
  ]
}