Titlebook: Observing and Measuring Visual Double Stars; R. W. Argyle Book 2012Latest edition Springer Science+Business Media New York 2012

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Orbit Computation,ch larger than errors in positions of planets, asteroids or comets. Therefore these methods are entirely different than calculating an orbit in our planetary system. The decision about whether to calculate an orbit or not may depend on the following considerations:

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DUCE

ARK

Simple Techniques of Measurement,e different techniques, in ascending order of sophistication: the ring method, the chronometric method, and finally the use of reticle eyepieces. Of these, the ring method is the simplest, requiring in its crudest form nothing more than an ordinary stopwatch with lap facility. By the addition of a c

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JAMB

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Lucky Imaging,ysed in the computer, and the image is permanent, and can be re-called for future reference. Another benefit of direct imaging is that brightness differences of the components can be measured, which is especially interesting for pairs with contrasting colours.

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The DSLR Camera,an buy cameras of higher and higher pixel number, and mass production has resulted in the great reduction of prices. CMOS sensors used for imaging are increasingly sensitive, and the electronics in the cameras allows images to be taken with much less noise. The software background is developing in a

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Astrometric Speckle Interferometry for the Amateur,ology has made electronics and computers both more sophisticated and cheaper, encouraging the savvy amateur to try an astronomical technique not usually thought of as being in the amateur arsenal, speckle interferometry.

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Internet Astrometry,to dark skies. But those who live in highly polluted areas, or do not have access to very specialized equipment, still have many possibilities; amongst which is using the online resources available from the internet. In this chapter we explore ., ., and ., three resources created and maintained by t