{
  "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 $R = E / ΔE \\approx 1000$, 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 iron K$α$ emission lines from galactic center molecular clouds, and we detect evidence of orbital redshift modulation in the 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 motivates reexamination of how X-ray photon data is packaged in the emerging era of high-resolution X-ray spectroscopy.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.36042",
  "author_total": 2,
  "authors": [
    {
      "name": "Stephen DiKerby"
    },
    {
      "name": "Shuo Zhang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/a624a9eqshm8j.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.36042",
  "fulltext_url": null,
  "id": "a624a9eqshm8j",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.36042",
  "language": null,
  "licence": "CC-BY-NC-SA-4.0",
  "licence_label": "CC BY-NC-SA 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "arxiv",
      "astro-ph.IM"
    ],
    [
      "openalex",
      "3105|Astronomy and Astrophysical Research"
    ]
  ],
  "openalex": "W7214926555",
  "pdf_url": "https://arxiv.org/pdf/2609.36042",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/a624a9eqshm8j.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2609.36042",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.36042"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.IM",
      "subfield": "instrumentation-methods"
    }
  ],
  "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": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/a624a9eqshm8j",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.3847/1538-4357/aeaa50",
      "pid": "3sn99rfs41yrm",
      "relation": "published-as",
      "title": "First Detection of the Doppler Shift of X-Ray Photons Due to a Telescope’s Orbital Motion",
      "venue": "The Astrophysical Journal"
    }
  ]
}