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dc.contributor.authorOjha, R.
dc.contributor.authoret al.
dc.date.accessioned2020-03-10T14:48:39Z
dc.date.available2020-03-10T14:48:39Z
dc.date.issued2009
dc.description.abstractThis Technical Note describes the generation by an international team of the second realization of the International Celestial Reference Frame (ICRF2) at radio wavelengths using nearly 30 years of Very Long Baseline Interferometry (VLBI) observations. ICRF2 contains precise positions of 3414 compact radio astronomical sources, more than five times the number as in the first ICRF, hereafter ICRF1. Further, the ICRF2 is found to have a noise floor of only ≈ 40 µas, some 5−6 times better than ICRF1, and an axis stability of ≈ 10 µas, nearly twice as stable as ICRF1. Alignment of ICRF2 with the International Celestial Reference System (ICRS) was made using 138 stable sources common to both ICRF2 and ICRF1-Ext2. Future maintenance of ICRF2 will be made using a set of 295 new “defining” sources selected on the basis of positional stability and the lack of extensive intrinsic source structure. The stability of these 295 defining sources, and their more uniform sky distribution eliminates the two largest weaknesses of ICRF1.en_US
dc.description.urihttps://www.iers.org/IERS/EN/Publications/TechnicalNotes/tn35.htmlen_US
dc.format.extent204 pagesen_US
dc.genrebooksen_US
dc.identifierdoi:10.13016/m2eipx-teij
dc.identifier.citationOjha, R.; The Second Realization of the International Celestial Reference Frame by Very Long Baseline Interferometry; International Earth Rotation and Reference Systems Service (IERS), IERS Technical Note No. 35 (2009); https://www.iers.org/IERS/EN/Publications/TechnicalNotes/tn35.htmlen_US
dc.identifier.urihttp://hdl.handle.net/11603/17516
dc.language.isoen_USen_US
dc.publisherInternational Earth Rotation and Reference Systems Service
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.subjectsecond realization of the International Celestial Reference Frame (ICRF2)en_US
dc.subjectradio wavelengthsen_US
dc.subjectVery Long Baseline Interferometry (VLBI)en_US
dc.subjectInternational Celestial Reference Frame (ICRF1)en_US
dc.titleThe Second Realization of the International Celestial Reference Frame by Very Long Baseline Interferometryen_US
dc.typeTexten_US


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