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Cometary astrometry with the Sydney Observatory astrograph

Published online by Cambridge University Press:  04 August 2017

Col Bembrick ,
Jeff Byron  and
David Phipps
Col Bembrick
Affiliation:
British Astronomical Association (New South Wales Branch) c/- Sydney Observatory, Observatory Hill Sydney, N.S.W., 2000 Australia
Jeff Byron
Affiliation:
British Astronomical Association (New South Wales Branch) c/- Sydney Observatory, Observatory Hill Sydney, N.S.W., 2000 Australia
David Phipps
Affiliation:
British Astronomical Association (New South Wales Branch) c/- Sydney Observatory, Observatory Hill Sydney, N.S.W., 2000 Australia

Abstract

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The New South Wales Branch of the British Astronomical Association is currently making use of the Sydney Observatory astrograph for cometary astrometry. Astrometric plates (16 × 16 cm) of P/Halley are being taken at a plate scale of 116 arcsec/mm with a field of 5 × 5 degrees. Plate measuring is accomplished by means of a mechanical single screw Hilger measuring machine. Plate reduction utilises the program supplied by the International Halley Watch organisation. Measurement and reduction is facilitated by the machine readable catalogue and plotting routines supplied by the United States Naval Observatory. Currently the BAA observing team is working towards achieving a 24 hr turnaround for plate reductions. This will enable useful contributions to be made during the critical pre-encounter periods.

Type
II. Photometric Research Programmes
Information
Symposium - International Astronomical Union , Volume 118: Instrumentation and Research Programmes for Small Telescopes , 1986 , pp. 271 - 272
Copyright
Copyright © Reidel 1986