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Astrometry with the HST Planetary Camera

Published online by Cambridge University Press:  07 August 2017

T. M. Girard
Affiliation:
Dept. of Astronomy, Yale University P.O. Box 208101, New Haven, CT 06520-8101
Y. Li
Affiliation:
Dept. of Astronomy, Yale University P.O. Box 208101, New Haven, CT 06520-8101
W. F. Van Altena
Affiliation:
Dept. of Astronomy, Yale University P.O. Box 208101, New Haven, CT 06520-8101
J. M. Nunez
Affiliation:
Univ. of Barcelona, Spain
G. F. Benedict
Affiliation:
Univ. of Texas, USA
R. L. Duncombe
Affiliation:
Univ. of Texas, USA
P. D. Hemenway
Affiliation:
Univ. of Texas, USA
W. H. Jefferys
Affiliation:
Univ. of Texas, USA
B. McArthur
Affiliation:
Univ. of Texas, USA
J. McCartney
Affiliation:
Univ. of Texas, USA
E. Nelan
Affiliation:
Univ. of Texas, USA
P. Shelus
Affiliation:
Univ. of Texas, USA
D. Story
Affiliation:
Univ. of Texas, USA
A. L. Whipple
Affiliation:
Univ. of Texas, USA
O. G. Franz
Affiliation:
Lowell Obs., USA
L. W. Wasserman
Affiliation:
Lowell Obs., USA
L. W. Fredrick
Affiliation:
Univ. of Virginia, USA

Abstract

The astrometric capability of the Hubble Space Telescope Planetary Camera (WF/PC1) is investigated, motivated by a study of the internal velocity distribution of globular clusters. The astrometric accuracy of the HST PC will be determined ultimately by 1) the accuracy to which the aberrated images can be ‘centered’, and 2) the accuracy to which the distortions across the PC field can be modeled. A series of overlapping exposures of two clusters, NGC 6752 and M15, are utilized to examine these issues.

We have made use of maximum-likelihood image reconstruction to address the first issue, with good success. Reconstruction improves both the detectability and precision of the image centers. A preliminary exploration of the second issue, that of modeling the distortion across the PC field, is also presented, using positions derived from the multiple overlapping exposures.

Type
1. Current Advances in Astrometry
Copyright
Copyright © Kluwer 1995 

References

Benedict, G. F., McArthur, B., Nelan, E., Story, D., Whipple, A. L., Wang, Q., Jefferys, W. H., Duncombe, R. L., Hemenway, P. D., Shelus, P. J., van Altena, W. F., Franz, O. G., and Fredrick, L. W. (1994) ‘HST, a generator of sub-millisecond of arc parallaxes’ (This volume) Google Scholar
Girard, T. M. and van Altena, W. F., (1990) BAAS 22, 1277.Google Scholar
Nunez, J. M. and Llacer, J. (1990) Astrophys. and Space Sci. 171, 341.CrossRefGoogle Scholar

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