{
  "abstract": "We present results from multi-band g, r, and i, observations of C/2025 K1 (ATLAS) taken with the Gemini North 8.1-m/GMOS imager on 2025 December 6 and December 24, and u, g, r, i, and z observations with the Astrophysical Research Consortium (ARC) 3.5-m/ARCTIC imager on 2025 December 8. We identify at least four distinct fragments in the Gemini and ARC images, designated as A, C, D, and E in these data taken between 2025 December 6 and 24. Color indices are determined from the December 8 ARC observations of fragments A and C, and from the Gemini observations on December 24 for A, C, and D. K1 has an unusually blue g-r color of $\\sim$0.40. The color difference between the comet and its fragments at the two epochs may be explained by particle size and light-scattering effects. We used the Gemini observations to calculate dust mass-loss rates for fragments A, C, and D. We conclude that C/2025 K1 has moderate dust mass-loss rates for millimeter-sized dust of $\\sim$50 kg/s for the A and C fragments.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.29698",
  "author_total": 11,
  "authors": [
    {
      "name": "Carl Ingebretsen"
    },
    {
      "name": "Bryce T. Bolin"
    },
    {
      "name": "Meredith A. MacGregor"
    },
    {
      "name": "Carey M. Lisse"
    },
    {
      "name": "Matthew Belyakov"
    },
    {
      "name": "Gracyn Jewett"
    },
    {
      "name": "Mukremin Kilic"
    },
    {
      "name": "Marco Micheli"
    },
    {
      "name": "Davide Farnocchia"
    },
    {
      "name": "Brian Lemaux"
    },
    {
      "name": "Hyewon Suh"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/c392v7d5kctjy.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.29698",
  "fulltext_url": null,
  "id": "c392v7d5kctjy",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.29698",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.EP"
    ],
    [
      "openalex",
      "3103|Astro and Planetary Science"
    ]
  ],
  "openalex": "W7204889678",
  "pdf_url": "https://arxiv.org/pdf/2608.29698",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-30",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/c392v7d5kctjy.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:41Z",
      "native_id": "2608.29698",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.29698"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.EP",
      "subfield": "planetary"
    }
  ],
  "title": "Gemini and Apache Point Multi-band Optical Imaging Characterization of Fragmenting Long-period Comet C/2025 K1 (ATLAS)",
  "title_text": "Gemini and Apache Point Multi-band Optical Imaging Characterization of Fragmenting Long-period Comet C/2025 K1 (ATLAS)",
  "type": "preprint",
  "updated_at": "2026-11-06T18:21:10Z",
  "url": "https://research.draconitic.com/paper/c392v7d5kctjy",
  "venue": "arXiv",
  "versions": []
}