Deep Astrometric Standards
2007 ◽
Vol 3
(S248)
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pp. 320-323
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AbstractThe advent of next-generation telescopes with very wide fields-of-view creates a need for deep and precise reference frames for astrometric calibrations. The Deep Astrometric Standards (DAS) program is designed to establish such a frame, by providing absolute astrometry at the 5–10 mas level in four 10 deg2 Galactic fields, to a depth of V=25. The source of our basic reference frame is the UCAC2 catalog, significantly improved by additional observations, and new VLBI positions of radio-loud and optically visible QSOs. We describe all the major steps in the construction of the DAS fields and provide the current status of this project.
2018 ◽
Vol 15
(3)
◽
pp. 229-236
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2018 ◽
Vol 70
(4)
◽
pp. 379
◽
2019 ◽
Vol 43
(169)
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pp. 638-645
Keyword(s):
2021 ◽
2021 ◽
1951 ◽
Vol 70
(2)
◽
pp. 1239-1248
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