{"@type": "dcat:Dataset", "accessLevel": "public", "accrualPeriodicity": "irregular", "bureauCode": ["026:00"], "contactPoint": {"@type": "vcard:Contact", "fn": "Thomas Morgan", "hasEmail": "mailto:thomas.h.morgan@nasa.gov"}, "description": "The Astrometry Net of the International Halley Watch (IHW) compiled astrometric observations of comet 1P/Halley from observations made by professional astronomers from ground-based observatories all over the world. The data set comprises 6475 astrometric observations over the period 16 Oct 1982 through 9 Jan 1989, in addition to 158 observations from the 1835 apparition and 1696 observations from the 1910 apparition. The data from previous apparitions was re-reduced using modern star catalogs.", "identifier": "urn:nasa:pds:context_pds3:data_set:data_set.ihw-c-astr-2-edr-halley-v2.0_shu6-z732", "issued": "2021-05-21", "keyword": ["1p-halley-1-1682-q1", "international-halley-watch"], "landingPage": "https://pds.nasa.gov/ds-view/pds/viewDataset.jsp?dsid=IHW-C-ASTR-2-EDR-HALLEY-V2.0", "license": "http://www.usa.gov/publicdomain/label/1.0/", "modified": "2025-07-17", "programCode": ["026:005"], "publisher": {"@type": "org:Organization", "name": "National Aeronautics and Space Administration"}, "references": ["https://pds.nasa.gov"], "theme": ["Earth Science"], "title": "IHW COMET HALLEY ASTROMETRIC DATA, V2.0"}