By Peter Van De Kamp (auth.)
This is the most recent attempt in a chain of displays all started in 1949 with a chain of lectures on long-focus photographic astrometry given via the writer as Fulbright professor in Paris on the invitation via the past due H. Mineur, at the moment Director of the Institut d' Astrophysique. those previous lectures have been released as a sequence of assessment articles in well known Astronomy (1951) and seemed either as Contributions de l'Institut d'Astrophysique, Serie A, No. eighty one and as reprint No. seventy five of Sproul Observatory. A extra problematic presenta tion used to be given in 1963 in Stars and Stellar structures, which used to be through ideas of Astrometry (1967, W. H. Freeman & Co.). through the moment 1/2 1974, back less than Fulbright auspices, on the invitation of Pik Sin The, I lectured on the Astronomical Institute in Amster dam, via a quick direction in May-June 1978 on the invitation of E. P. J. van den Heuvel. I gave a extra vast path on the Institut d' As trophysique on the invitation of J. C. Pecker of the school de France and of J. Audouze, Director of the LA.P. either in Amsterdam and in Paris I had awarded occasional astrometric subject matters at a number of instances. the chance to lecture in France and in Holland has facilitated, encouraged and superior the association and contents of the shows near to long-focus photographic astrometry.
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Extra info for Stellar Paths: Photographic Astrometry with Long-Focus Instruments
We give a brief report of what appears to be known for the long-range series of photographs obtained at the Sproul Obervatory. These observations, often extending over more than four decades, were planned and are a sine qua non for long-range studies of orbital motion and of systematic errors. The series may be subject to temporal changes (gradual or abrupt) in photographic portrayal, due to a variety of causes, such as changes in the optical performance of the objective, changes in filter and in photographic emulsion.
Do = y. da is the projection of the path in the x-coordinate measured in right ascension, and 0 is the declination. In comparing results expressed in rectangular and in equatorial coordinates, the above change in position angle must be kept in mind, and secular effects should be considered, especially for stars of large proper motion situated at high declination; the effect on the components of the annual parallactic motion is negligible. The difference between spherical and plane portrayal of a stellar path 1000" long remains below 0~01, and is therefore generally negligible.
Hershey. The urgent need for faster measuring techniques in the mid-1960's prompted planning with other observatories and the Grant Instrument Company of Berkeley, California, for the design and construction of a two-screw measuring machine satisfying the Sproul specifications. Four machines were made simultaneously with a number of options to satisfy the needs of each prospective customer. At that time the one-coordinate Grant spectrum comparator had proven successful in spectroscopy at numerous institutions.