{
  "annotation_id": "6a182895-73c6-4284-b666-459a496ecd1e",
  "date_created": "2026-02-17T05:53:20.513000Z",
  "date_modified": "2026-02-17T05:53:20.513000Z",
  "file_hash": "9d1fe6af8652eee63a4352b4f01b27ea272f7ac268e2053ce5215e3dd0d41ccd",
  "private": false,
  "record": {
    "abstract": "We utilize Gaia DR3 data to report the discovery of a new star cluster, Nasser 1, located 32 arcmin from Czernik 38 at coordinates $\\alpha= 282.11 \\pm 0.05$ and $\\delta= 4.56 \\pm 0.05$. Using a variable membership probability threshold technique with pyUPMASK, we confirm Nasser 1 as a genuine open cluster. It exhibits a distinct King profile and a well-defined CMD with an age of $125.0 \\pm 12.30$ Myr, a distance modulus of $12.87 \\pm 0.21$ mag, and a color excess of $2.42 \\pm 0.09$. Nasser 1 shares consistent physical parameters (age, distance, kinematics, and reddening) with Czernik 38, suggesting they constitute a young primordial binary system in the Carina-Sagittarius spiral arm. Both clusters display elongations indicative of differential rotation tides; Nasser 1 is additionally perturbed by the spiral arm\u0027s gravitational field. Gaussian mass function analysis suggests the two were formerly a single cluster, violently torn apart by differential rotation.",
    "arxiv_id": "2601.09670",
    "authors": [
      "Nasser M. Ahmed"
    ],
    "categories": [
      "astro-ph.GA",
      "astro-ph.SR"
    ],
    "license": "http://creativecommons.org/publicdomain/zero/1.0/",
    "title": "Discovery of a new open cluster as a companion to Czernik 38 cluster and its associated complex tide, using Gaia DR3",
    "url": "https://arxiv.org/abs/2601.09670",
    "version": "v1"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d0fb3085-c547-4d65-a858-53bad3448eb4",
    "id": "arXiv Dataset",
    "type": "Model",
    "variant": "snapshot-2026-01-17",
    "version": "0.1.0"
  },
  "user_id": 1000002
}