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Maintenance of the ICRF: Optical

Published online by Cambridge University Press:  14 August 2015

N. Zacharias
N. Zacharias*
Affiliation:
U.S. Naval Observatory, 3450 Mass. Av. NW, Washington DC 20392, USA. nz@pyxis.usno.navy.mil

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The International Celestial Reference Frame (ICRF) is presently realized by the positions of 608 compact, extragalactic radio sources (Ma & Feissel 1997) with milliarcsecond (mas) and sub-mas accuracy, all being on the same system, the International Celestial Reference System (ICRS). The Hipparcos Catalogue (ESA 1997) is the practical realization of the ICRF at optical wavelengths, giving high accuracy positions (≈1 mas) and proper motions (≈1 mas/yr) for 117955 stars (ESA 1997). The link between the radio and optical frames has been achieved by various methods (Kovalevsky et al. 1997). The accuracy of this link is estimated to be 0.6 mas at the mean epoch of Hipparcos (1991.25) for the orientation, and 0.25 mas/year for the system rotation.

Type
II. Joint Discussions
Information
Highlights of Astronomy , Volume 11 , Issue 1: Highlights of Astronomy. As presented at the XXIIIrd General Assembly of the IAU (Part A), 1997 , 1998 , pp. 322 - 324
Copyright
Copyright © Kluwer 1998

References

Armstrong, J.T., Mozurkewich, D., Rickard, L.J/, Hutter, D.J., Benson, J.A., Bowers, P.F., Elias, N.M.H., Hummel, C.A., Johnston, K.J., Buscher, D.F., Clark, J.H. III, Ha, L., Ling, L.-C., White, N.M., & Simon, R.S. (1998), The Navy Prototype Optical Interferometer (NPOI), ApJ, acceptedGoogle Scholar
de Vegt, C., Johnston, K.J. et al. (1998) VLA radio star observations for the reference frame link, in preparation Google Scholar
ESA (1997) The Hipparcos and Tycho Catalogues. European Space Agency, SP-1200 Google Scholar
Fey, A.L. & Charlot, P. (1997) ApJS 111, 95 Google Scholar
Gauss, F.S., Zacharias, N., Rafferty, T.J., Germain, M.E., Holdenried, E.R., Pohlman, J.W. & Zacharias, M.I. (1997) A new astrometric survey of the Southern Hemisphere, BAAS 28, No.4, 1282 Google Scholar
Johnston, K.J., Russell.J., , de Vegt, C., Hughes, J., Jauncey, D., White, G., & Nicolson, G. (1988) In The Impact of VLBI on Astrophysics and Geodesy, IAU Symposium No.129, edited by Reid, M. and Moran, J., Kluwer, Dordrecht, p. 317 Google Scholar
Johnston, K.J., Fey, A.L., Zacharias, N., Russell, J.L., Ma, C., de Vegt, C., Jauncey, D.L., Reynolds, J.E., Archinal, B.A., Carter, M.S., Corbin, T.E., Eubanks, T.M., Florkowski, D.R., Hall, D.M., McCarthy, D.D., McCulloch, P.M., Nicolson, G.D., Shaffer, D.B., Sovers, O.J., & Jacobs, C.S. (1995) AJ 110, 880 Google Scholar
Kovalevsky, J., Lindegren, L., Perryman, M.A.C., Hemenway, P.D., Johnston, K.J., Kislyuk, V.S., Lestrade, J.F., Morrison, L.V., Platais, I., Roeser, S., Schilbach, E., Tucholke, H.-J., de Vegt, C., Vondrak, J., Arias, F., Gontier, A.M., Arenou, F., Brosche, P., Florkowski, D.R., Garrington, S.T., Preston, R.A., Ron, C., Rybka, S.P., Scholz, R.-D., & Zacharias, N. (1997) The Hipparcos Catalogue as a realisation of the extragalactic reference system, A&A 323, 620 Google Scholar
Lestarde, J.F., Jones, D.L., Preston, R.A., et al. (1995) A&A 304, 182 Google Scholar
Ma, C. & Feissel, M. (1997) Definition and Realization of the International Celestial Reference System by VLBI Astrometry of Extragalactic Objects, IERS Technical Note 23 Google Scholar
Morrison, L.V., Garrington, S.T., Argyle, R.W. & Davis, R.J. (1997) Future control of the Hipparcos frame using MERLIN, in Hipparcos Venice ’97, ESA SP-402, 143–145 Google Scholar
Zacharias, N., de Vegt, C., Winter, L., & Johnston, K.J. (1995) AJ 110, 3093 Google Scholar
Zacharias, N. (1997) Astrometric Quality of the USNO CCD Astrograph AJ 113, 1925 Google Scholar