{"id":"https://openalex.org/W1987166307","doi":"https://doi.org/10.1086/111928","title":"Radio source positions from very-long-baseline interferometry observations","display_name":"Radio source positions from very-long-baseline interferometry observations","publication_year":1976,"publication_date":"1976-08-01","ids":{"openalex":"https://openalex.org/W1987166307","doi":"https://doi.org/10.1086/111928","mag":"1987166307"},"language":"en","primary_location":{"id":"doi:10.1086/111928","doi":"https://doi.org/10.1086/111928","is_oa":false,"landing_page_url":"https://doi.org/10.1086/111928","pdf_url":null,"source":{"id":"https://openalex.org/S100695177","display_name":"The Astronomical Journal","issn_l":"0004-6256","issn":["0004-6256","1538-3881"],"is_oa":false,"is_in_doaj":true,"is_core":true,"listed_in":["cwts-core","doaj","dongbi-b","jufo-1","norway-1","oarl","poland-140","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310311669","host_organization_name":"Institute of Physics","host_organization_lineage":["https://openalex.org/P4310311669"],"host_organization_lineage_names":["Institute of Physics"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"The Astronomical Journal","raw_type":"journal-article"},"volume":null,"type":"article","indexed_in":["crossref","doaj"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5102884468","display_name":"Thomas Alan Clark","orcid":"https://orcid.org/0000-0002-2185-7543","observed_orcids":["https://orcid.org/0000-0002-2185-7543"]},"institutions":[{"id":"https://openalex.org/I1306266525","display_name":"Goddard Space Flight Center","ror":"https://ror.org/0171mag52","country_code":"US","type":"facility","lineage":["https://openalex.org/I1306266525","https://openalex.org/I4210124779"]},{"id":"https://openalex.org/I66946132","display_name":"University of Maryland, College Park","ror":"https://ror.org/047s2c258","country_code":"US","type":"education","lineage":["https://openalex.org/I66946132"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"T. A. Clark","raw_affiliation_strings":["NASA, Goddard Space Flight Center, Greenbelt, Md; Maryland, University, College Park, Md","Maryland, University, College Park, Md","NASA, Goddard Space Flight Center, Greenbelt, Md"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"NASA, Goddard Space Flight Center, Greenbelt, Md; Maryland, University, College Park, Md","institution_ids":["https://openalex.org/I1306266525","https://openalex.org/I66946132"]},{"raw_affiliation_string":"Maryland, University, College Park, Md","institution_ids":["https://openalex.org/I66946132"]},{"raw_affiliation_string":"NASA, Goddard Space Flight Center, Greenbelt, Md","institution_ids":["https://openalex.org/I1306266525"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5102322368","display_name":"L. K. Hutton","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I1306266525","display_name":"Goddard Space Flight Center","ror":"https://ror.org/0171mag52","country_code":"US","type":"facility","lineage":["https://openalex.org/I1306266525","https://openalex.org/I4210124779"]},{"id":"https://openalex.org/I66946132","display_name":"University of Maryland, College Park","ror":"https://ror.org/047s2c258","country_code":"US","type":"education","lineage":["https://openalex.org/I66946132"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"L. K. Hutton","raw_affiliation_strings":["NASA, Goddard Space Flight Center, Greenbelt, Md; Maryland, University, College Park, Md","Maryland, University, College Park, Md","NASA, Goddard Space Flight Center, Greenbelt, Md"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"NASA, Goddard Space Flight Center, Greenbelt, Md; Maryland, University, College Park, Md","institution_ids":["https://openalex.org/I1306266525","https://openalex.org/I66946132"]},{"raw_affiliation_string":"Maryland, University, College Park, Md","institution_ids":["https://openalex.org/I66946132"]},{"raw_affiliation_string":"NASA, Goddard Space Flight Center, Greenbelt, Md","institution_ids":["https://openalex.org/I1306266525"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5010002106","display_name":"Gerard E. Marandino","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I1306266525","display_name":"Goddard Space Flight Center","ror":"https://ror.org/0171mag52","country_code":"US","type":"facility","lineage":["https://openalex.org/I1306266525","https://openalex.org/I4210124779"]},{"id":"https://openalex.org/I66946132","display_name":"University of Maryland, College Park","ror":"https://ror.org/047s2c258","country_code":"US","type":"education","lineage":["https://openalex.org/I66946132"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"G. E. Marandino","raw_affiliation_strings":["NASA, Goddard Space Flight Center, Greenbelt, Md; Maryland, University, College Park, Md","Maryland, University, College Park, Md","NASA, Goddard Space Flight Center, Greenbelt, Md"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"NASA, Goddard Space Flight Center, Greenbelt, Md; Maryland, University, College Park, Md","institution_ids":["https://openalex.org/I1306266525","https://openalex.org/I66946132"]},{"raw_affiliation_string":"Maryland, University, College Park, Md","institution_ids":["https://openalex.org/I66946132"]},{"raw_affiliation_string":"NASA, Goddard Space Flight Center, Greenbelt, Md","institution_ids":["https://openalex.org/I1306266525"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5048906993","display_name":"Charles C. Counselman","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I63966007","display_name":"Massachusetts Institute of Technology","ror":"https://ror.org/042nb2s44","country_code":"US","type":"education","lineage":["https://openalex.org/I63966007"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"C. C. Counselman","raw_affiliation_strings":["MIT, Cambridge, Mass"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"MIT, Cambridge, Mass","institution_ids":["https://openalex.org/I63966007"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5108765463","display_name":"Douglas S. Robertson","orcid":"https://orcid.org/0000-0002-5415-0181","observed_orcids":["https://orcid.org/0000-0002-5415-0181"]},"institutions":[{"id":"https://openalex.org/I63966007","display_name":"Massachusetts Institute of Technology","ror":"https://ror.org/042nb2s44","country_code":"US","type":"education","lineage":["https://openalex.org/I63966007"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"D. S. Robertson","raw_affiliation_strings":["MIT, Cambridge, Mass"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"MIT, Cambridge, Mass","institution_ids":["https://openalex.org/I63966007"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5050866446","display_name":"Irwin I. Shapiro","orcid":"https://orcid.org/0000-0001-8948-9997","observed_orcids":["https://orcid.org/0000-0001-8948-9997"]},"institutions":[{"id":"https://openalex.org/I63966007","display_name":"Massachusetts Institute of Technology","ror":"https://ror.org/042nb2s44","country_code":"US","type":"education","lineage":["https://openalex.org/I63966007"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"I. I. Shapiro","raw_affiliation_strings":["MIT, Cambridge, Mass"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"MIT, Cambridge, Mass","institution_ids":["https://openalex.org/I63966007"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5031465496","display_name":"Jill J. Wittels","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I63966007","display_name":"Massachusetts Institute of Technology","ror":"https://ror.org/042nb2s44","country_code":"US","type":"education","lineage":["https://openalex.org/I63966007"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"J. J. Wittels","raw_affiliation_strings":["MIT, Cambridge, Mass"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"MIT, Cambridge, Mass","institution_ids":["https://openalex.org/I63966007"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5046024537","display_name":"Hans F. Hinteregger","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"H. F. Hinteregger","raw_affiliation_strings":["Haystack Observatory, Westford, Mass"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Haystack Observatory, Westford, Mass","institution_ids":[]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5109884082","display_name":"Curtis A. Knight","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"C. A. Knight","raw_affiliation_strings":["Haystack Observatory, Westford, Mass"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Haystack Observatory, Westford, Mass","institution_ids":[]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5004345345","display_name":"Alan E. E. Rogers","orcid":"https://orcid.org/0000-0003-1941-7458","observed_orcids":["https://orcid.org/0000-0003-1941-7458","https://orcid.org/0000-0002-4671-2551"]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"A. E. E. Rogers","raw_affiliation_strings":["Haystack Observatory, Westford, Mass"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Haystack Observatory, Westford, Mass","institution_ids":[]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":3,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":{"value":4499,"currency":"USD","value_usd":4499},"apc_paid":null,"fwci":12.6028,"has_fulltext":false,"cited_by_count":45,"citation_normalized_percentile":{"value":0.98855961,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":89,"max":94},"biblio":{"volume":"81","issue":null,"first_page":"599","last_page":"599"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T12450","display_name":"Radio Astronomy Observations and Technology","score":0.7246000170707703,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T12450","display_name":"Radio Astronomy Observations and Technology","score":0.7246000170707703,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10039","display_name":"Stellar, planetary, and galactic studies","score":0.06909999996423721,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T14163","display_name":"Astronomical Observations and Instrumentation","score":0.053199999034404755,"subfield":{"id":"https://openalex.org/subfields/2206","display_name":"Computational Mechanics"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/radio-source-positions","display_name":"radio source positions","score":0.8370000123977661},{"id":"https://openalex.org/keywords/very-long-baseline-interferometry","display_name":"very long baseline interferometry","score":0.8399999737739563},{"id":"https://openalex.org/keywords/extragalactic-radio-sources","display_name":"extragalactic radio sources","score":0.9380000233650208},{"id":"https://openalex.org/keywords/compact-radio-sources","display_name":"compact radio sources","score":0.7400000095367432},{"id":"https://openalex.org/keywords/positional-accuracy","display_name":"positional accuracy","score":0.652999997138977},{"id":"https://openalex.org/keywords/beta-persei","display_name":"Beta Persei","score":0.7699999809265137},{"id":"https://openalex.org/keywords/algol","display_name":"Algol","score":0.9750000238418579}],"concepts":[{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.9048794507980347},{"id":"https://openalex.org/C166689943","wikidata":"https://www.wikidata.org/wiki/Q850283","display_name":"Interferometry","level":2,"score":0.780899167060852},{"id":"https://openalex.org/C12725497","wikidata":"https://www.wikidata.org/wiki/Q810247","display_name":"Baseline (sea)","level":2,"score":0.7036823034286499},{"id":"https://openalex.org/C79896159","wikidata":"https://www.wikidata.org/wiki/Q1148351","display_name":"Very-long-baseline interferometry","level":2,"score":0.515026330947876},{"id":"https://openalex.org/C1276947","wikidata":"https://www.wikidata.org/wiki/Q333","display_name":"Astronomy","level":1,"score":0.4680326282978058},{"id":"https://openalex.org/C44870925","wikidata":"https://www.wikidata.org/wiki/Q37547","display_name":"Astrophysics","level":1,"score":0.37058812379837036},{"id":"https://openalex.org/C62649853","wikidata":"https://www.wikidata.org/wiki/Q199687","display_name":"Remote sensing","level":1,"score":0.36778634786605835},{"id":"https://openalex.org/C205649164","wikidata":"https://www.wikidata.org/wiki/Q1071","display_name":"Geography","level":0,"score":0.06919899582862854},{"id":"https://openalex.org/C111368507","wikidata":"https://www.wikidata.org/wiki/Q43518","display_name":"Oceanography","level":1,"score":0.0},{"id":"https://openalex.org/C127313418","wikidata":"https://www.wikidata.org/wiki/Q1069","display_name":"Geology","level":0,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1086/111928","doi":"https://doi.org/10.1086/111928","is_oa":false,"landing_page_url":"https://doi.org/10.1086/111928","pdf_url":null,"source":{"id":"https://openalex.org/S100695177","display_name":"The Astronomical Journal","issn_l":"0004-6256","issn":["0004-6256","1538-3881"],"is_oa":false,"is_in_doaj":true,"is_core":true,"listed_in":["cwts-core","doaj","dongbi-b","jufo-1","norway-1","oarl","poland-140","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310311669","host_organization_name":"Institute of Physics","host_organization_lineage":["https://openalex.org/P4310311669"],"host_organization_lineage_names":["Institute of Physics"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"The Astronomical Journal","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"study_designs":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":0,"referenced_works":[],"related_works":["https://openalex.org/W2022420890","https://openalex.org/W2053228205","https://openalex.org/W1559576082","https://openalex.org/W2054642729","https://openalex.org/W6959868163","https://openalex.org/W3010928805","https://openalex.org/W3048804451","https://openalex.org/W2075968288","https://openalex.org/W2495405266","https://openalex.org/W2010992044"],"abstract_inverted_index":{"Accurate":[0],"positions":[1,78],"of":[2,29,47,55,65,76,106,115,139,142],"compact":[3],"radio":[4,86],"sources":[5,24,105],"have":[6],"been":[7],"determined":[8,81],"from":[9,27,35,51,127],"very-long-baseline":[10],"interferometry":[11],"(VLBI)":[12],"observations":[13,30,56,130],"based":[14],"on":[15],"the":[16,33,41,44,48,52,63,69,83,89,93,116,123,140,143,152,162,166],"bandwidth-synthesis":[17],"technique.":[18],"The":[19],"coordinates":[20,50],"for":[21,62,151],"18":[22],"extragalactic":[23],"were":[25,109],"obtained":[26,121,150],"sets":[28,54],"spread":[31],"over":[32],"period":[34],"April":[36],"1972":[37],"to":[38,96],"January":[39],"1975;":[40],"scatter":[42,70,91],"among":[43],"independent":[45],"determinations":[46],"source":[49],"separate":[53,128],"is":[57,71,148],"about":[58,72,92,98],"0.05":[59],"arcsec,":[60],"except":[61],"declinations":[64,141],"near-equatorial":[66,144],"sources,":[67],"where":[68],"0.15":[73],"arcsec.":[74],"Comparison":[75],"these":[77],"with":[79,82,119,161],"those":[80,120],"Cambridge":[84],"5-km":[85],"interferometer":[87],"shows":[88],"rms":[90,135],"mean":[94],"difference":[95],"be":[97],"0.04":[99],"arcsec":[100],"in":[101,110,165],"each":[102],"coordinate":[103],"(no":[104],"low":[107],"declination":[108],"common).":[111],"A":[112,146],"similar":[113],"comparison":[114],"present":[117],"results":[118],"by":[122],"Jet":[124],"Propulsion":[125],"Laboratory":[126],"VLBI":[129],"yields":[131],"a":[132],"slightly":[133],"larger":[134],"scatter,":[136],"after":[137],"exlusion":[138],"sources.":[145],"position":[147,163],"also":[149],"galactic":[153],"object":[154],"Beta":[155],"Persei":[156],"(Algol),":[157],"which":[158],"agrees":[159],"well":[160],"given":[164],"FK":[167],"4":[168],"catalogue.":[169]},"counts_by_year":[{"year":2024,"cited_by_count":1},{"year":2022,"cited_by_count":1},{"year":2020,"cited_by_count":1},{"year":2014,"cited_by_count":1}],"updated_date":"2026-10-16T09:59:22.235173","created_date":"2016-06-24T00:00:00"}
