{
  "id": "2204.08482",
  "version": "v1",
  "published": "2022-04-18T18:00:00.000Z",
  "updated": "2022-04-18T18:00:00.000Z",
  "title": "New Constraints on the Composition and Initial Speed of CNEOS 2014-01-08",
  "authors": [
    "Amir Siraj",
    "Abraham Loeb"
  ],
  "comment": "5 pages, 1 figure; submitted to an AAS Journal",
  "categories": [
    "astro-ph.EP"
  ],
  "abstract": "We study the newly released light curve from the fireball of the first interstellar meteor CNEOS 2014-01-08. The measured velocity and three observed flares down to an altitude of $18.7 \\mathrm{\\; km}$ imply ambient ram pressure in the range of $113-194$ MPa when the meteor disintegrated. The required yield strength is $\\gtrsim 20$ times higher than stony meteorites and $\\gtrsim 2$ times larger than iron meteorites. The implied slowdown in the atmosphere suggests an initial speed of about $66.5 \\; {\\rm km~s^{-1}}$, strengthening the case for an interstellar origin of this meteor and making it an outlier relative to the velocity dispersion of local stars.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-04-18T18:00:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "constraints",
      "first interstellar meteor cneos",
      "composition",
      "imply ambient ram pressure",
      "local stars"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}