The Celestron Micro Guide project is an international collaboration of eight observers (three from the USA, two from the UK, three from Spain), with the goal of determining whether or not the MicroGuide eyepiece (see Chapter 12) has enough sophistication, in the hands of an experienced observer, to yield useful scientific measures of separation and position angle. The members agreed to work under a protocol that calls for each to measure a few "fixed" pairs from a list of about 125 culled from the Washington Double Star Catalogue. The purpose of this preliminary set of measures was to determine (a) whether or not the observer has sufficient skill, (b) whether or not the MicroGuide can produce reliable results when compared to known pairs, and (c) establish the "scale constant" of the linear scale for each participant, as this value will vary from telescope to telescope and whether or not a Barlow lens is used.
The results of this work were published in The Deep-Sky Observer of the Webb Society. Overall, the results from eight observers showed that it was possible to achieve ± 1° in PA and ±1" in separation. The average value for the angular size of a single division was 14".
Also in the USA is the Double Star Observer, an international journal that is devoted exclusively to visual double star astronomy, edited and produced by Ronald Tanguay. The aim of the magazine is to encourage amateur/professional cooperation in the field of double star astronomy, and to provide amateur visual double star observers with easy access to a journal where they may publish the results of their research and observations.
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