{
  "kind": "actual archived binned stellar occultation profile; exact source rows, not simulated photons or raw spacecraft telemetry",
  "dataset_id": "CO-SR-UVIS-HSP-2/4-OCC-V3.0",
  "dataset_citation": "Colwell, J.E., R.G. Jerousek, T.M. Becker, and L.W. Esposito, CASSINI ORBITER SATURN UVIS RING STELLAR OCCULTATIONS 3.0, NASA Planetary Data System, 2020.",
  "product_id": "UVIS_HSP_2008_261_ALPARA_E_TAU01KM.TAB",
  "product_creation_time": "2020-11-27T20:00:00",
  "source_url": "https://pds-rings.seti.org/holdings/volumes/COUVIS_8xxx/COUVIS_8001/data/UVIS_HSP_2008_261_ALPARA_E_TAU01KM.TAB",
  "label_url": "https://pds-rings.seti.org/holdings/volumes/COUVIS_8xxx/COUVIS_8001/data/UVIS_HSP_2008_261_ALPARA_E_TAU01KM.LBL",
  "readme_url": "https://pds-rings.seti.org/holdings/volumes/COUVIS_8xxx/COUVIS_8001/aareadme.txt",
  "retrieved_date": "2026-10-28",
  "http_range": "bytes=3810411-3931531",
  "first_record_zero_based": 31491,
  "records": 1001,
  "record_bytes": 121,
  "full_product_bytes": 7740975,
  "full_product_hash": "not downloaded or verified; only exact range hash verified",
  "radius_km": [
    125000,
    126000
  ],
  "radial_sampling_km": 1,
  "wavelength_nm": [
    110,
    190
  ],
  "bandpass_is_not_spatial_wavelength": "UV band is fixed; tutorial wavelength means radial spacing of ring structure, not light wavelength",
  "ring_opening_angle_deg": 54.4,
  "geometry": "x radial distance from Saturn center; archive longitude and phi in degrees; times TDB seconds since J2000, observed event later than ring event by photon travel time",
  "quality": "all 1001 retained NOTE_FLAG values are zero; preserve all flags and invalid/saturated rows in input; label quality GOOD",
  "background": "MEAN SIGNAL is photon counts per raw integration, background NOT subtracted. Subtract BACKGROUND MODEL once; divide by UNOCCULTED STAR MODEL (star-only) before log. Never subtract background from published normal optical depth.",
  "uncertainty": "conditional Poisson error of binned mean from mean signal / number of raw samples; treats background and unocculted model as fixed; calibration, correlated structure, diffraction, finite stellar disk and model errors are not included. Maximum detectable tau is a counting-statistics sensitivity quantity, not per-row sigma.",
  "license": "Public NASA PDS scientific archive, preserved citation request in original README. NASA open-data catalog lists U.S. public-domain government data; do not assert a separate Creative Commons license. Source labels and creators retained.",
  "version_warning": "Landing page still describes v2 (2019); downloaded product label and volume README explicitly identify v3.0 (2020), which is frozen here.",
  "files": [
    {
      "filename": "cassini-uvis-alpara-2008-261-cutout.tab",
      "bytes": 121121,
      "sha256": "6baadf1d91701ad8e868745f7aad9e49d853cec169ce45fea51b9a4f30fdd94c"
    },
    {
      "filename": "cassini-uvis-alpara-2008-261.lbl",
      "bytes": 12032,
      "sha256": "d43f8acf312cdc6d4c689fe787efc00a713077bdb90791f7e74032e6663504d8"
    },
    {
      "filename": "cassini-uvis-readme.txt",
      "bytes": 9563,
      "sha256": "ebff946ecc95d5b9c6ef7e973bfceb8fa118b2e9d0cfd216f673f27c9ea6cfbc"
    }
  ]
}