3I/ATLAS (C/2025 N1)

{
  "designation": "C/2025 N1 (ATLAS)",
  "epoch": "2460905.5",
  "elements": {
    "q": 1.36,
    "e": 6.14,
    "i": 175,
    "omega": 128,
    "node": 322,
    "M": -527,
    "tp": 2460977.982
  },
  "source": "JPL SBDB API - https://ssd-api.jpl.nasa.gov/sbdb.api?des=C%2F2025%20N1&phys-par=1 (retrieved 2026-01-15T00:37:20.536Z)",
  "raw": {
    "phys_par": [
      {
        "ref": "48",
        "units": null,
        "notes": "2 parameter fit from 732 observations, autocmod 3.0g",
        "title": "comet total magnitude",
        "name": "M1",
        "desc": "absolute magnitude of comet and coma (i.e. total)",
        "value": "12.5",
        "sigma": "0.9"
      },
      {
        "title": "comet total magnitude slope",
        "name": "K1",
        "value": "4.5",
        "sigma": null,
        "desc": "comet total magnitude slope parameter",
        "units": null,
        "ref": "48",
        "notes": "autocmod 3.0g"
      }
    ],
    "signature": {
      "source": "NASA/JPL Small-Body Database (SBDB) API",
      "version": "1.3"
    },
    "object": {
      "prefix": "C",
      "neo": false,
      "des": "2025 N1",
      "orbit_class": {
        "name": "Hyperbolic Comet",
        "code": "HYP"
      },
      "orbit_id": "48",
      "spkid": "1004083",
      "pha": false,
      "fullname": "C/2025 N1 (ATLAS)",
      "kind": "cu"
    },
    "orbit": {
      "moid_jup": "0.247",
      "pe_used": "DE441",
      "last_obs": "2026-01-11",
      "n_dop_obs_used": null,
      "first_obs": "2025-05-15",
      "not_valid_before": null,
      "source": "JPL",
      "model_pars": [
        {
          "n": 1,
          "units": "au/d^2",
          "desc": "non-gravitational radial acceleration parameter",
          "kind": "EST",
          "sigma": "1.087E-9",
          "value": "4.512e-08",
          "title": "non-grav. radial accel.",
          "name": "A1"
        },
        {
          "kind": "EST",
          "value": "1.721e-08",
          "sigma": "1.503E-9",
          "desc": "non-gravitational transverse acceleration parameter",
          "title": "non-grav. transverse accel.",
          "name": "A2",
          "n": 2,
          "units": "au/d^2"
        },
        {
          "units": "au/d^2",
          "n": 3,
          "name": "A3",
          "title": "non-grav. normal accel.",
          "desc": "non-gravitational normal acceleration parameter",
          "value": "-5.83e-09",
          "sigma": "2.791E-10",
          "kind": "EST"
        },
        {
          "n": 0,
          "units": null,
          "value": "1.",
          "sigma": null,
          "kind": "SET",
          "desc": "normalizing factor [default 0.1112620426]",
          "name": "ALN",
          "title": "normalizing factor"
        },
        {
          "title": "non-grav. model exp. k",
          "name": "NK",
          "kind": "SET",
          "value": "0.",
          "sigma": null,
          "desc": "non-grav. model constant, exponent k [default 4.6142]",
          "units": null,
          "n": 0
        },
        {
          "n": 0,
          "units": null,
          "desc": "non-grav. model constant, exponent m [default 2.15]",
          "sigma": null,
          "value": "2.",
          "kind": "SET",
          "name": "NM",
          "title": "non-grav. model exp. m"
        },
        {
          "name": "NN",
          "title": "non-grav. model exp. n",
          "desc": "non-grav. model constant, exponent n [default 5.093]",
          "value": "0.",
          "sigma": null,
          "kind": "SET",
          "units": null,
          "n": 0
        },
        {
          "desc": "normalizing distance, au [default 2.808 au]",
          "kind": "SET",
          "sigma": null,
          "value": "1.",
          "title": "normalizing distance",
          "name": "R0",
          "n": 0,
          "units": "au"
        }
      ],
      "epoch": "2460905.5",
      "n_obs_used": 782,
      "comment": "Nongravitational accels. using g(r) = (1 au/ r)^2 for CO2",
      "soln_date": "2026-01-13 17:50:29",
      "orbit_id": "48",
      "condition_code": null,
      "data_arc": "241",
      "t_jup": null,
      "moid": "0.365",
      "two_body": null,
      "equinox": "J2000",
      "producer": "Davide Farnocchia",
      "elements": [
        {
          "units": null,
          "title": "eccentricity",
          "name": "e",
          "label": "e",
          "sigma": "1.1e-05",
          "value": "6.14"
        },
        {
          "units": "au",
          "name": "a",
          "title": "semi-major axis",
          "sigma": "4.4e-07",
          "value": "-0.264",
          "label": "a"
        },
        {
          "units": "au",
          "value": "1.36",
          "sigma": "1.3e-06",
          "label": "q",
          "title": "perihelion distance",
          "name": "q"
        },
        {
          "units": "deg",
          "label": "i",
          "value": "175",
          "sigma": "1.1e-05",
          "name": "i",
          "title": "inclination; angle with respect to x-y ecliptic plane"
        },
        {
          "label": "node",
          "value": "322",
          "sigma": "0.00017",
          "name": "om",
          "title": "longitude of the ascending node",
          "units": "deg"
        },
        {
          "units": "deg",
          "title": "argument of perihelion",
          "name": "w",
          "label": "peri",
          "sigma": "0.00018",
          "value": "128"
        },
        {
          "label": "M",
          "value": "-527",
          "sigma": "0.0012",
          "name": "ma",
          "title": "mean anomaly",
          "units": "deg"
        },
        {
          "units": "TDB",
          "title": "time of perihelion passage",
          "name": "tp",
          "sigma": "2.3e-05",
          "value": "2460977.982",
          "label": "tp"
        },
        {
          "units": "d",
          "label": "period",
          "value": null,
          "sigma": null,
          "title": "sidereal orbital period",
          "name": "per"
        },
        {
          "title": "mean motion",
          "name": "n",
          "label": "n",
          "sigma": "1.8e-05",
          "value": "7.27",
          "units": "deg/d"
        },
        {
          "title": "aphelion distance",
          "name": "ad",
          "value": null,
          "sigma": null,
          "label": "Q",
          "units": "au"
        }
      ],
      "rms": "0.41",
      "sb_used": "SB441-N16",
      "not_valid_after": null,
      "cov_epoch": "2460905.5",
      "n_del_obs_used": null
    }
  },
  "generated": "2026-01-15T00:37:20.536Z"
}