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The Journal of the British Astronomical Association, 2018 August

Volume 128, Number 4

Section Director David Arditti introduces the new Equipment & Techniques Section, and reports from the Mars, Saturn and Comet Sections highlight the planetary observing skills of BAA members.. Log in or join the BAA today to view this journal online. A full list of contents is also available. Selected highlights from this Journal:

Refereed Papers

Saturn in the 2008/2009 apparition: Part I
This report describes the observations of Saturn made by Saturn Section members during the 2008/2009 apparition. During this apparition, the rings were edge-on to the Sun and Earth on 2009 Aug 11 and Sep 4 respectively
Mike Foulkes
The brighter comets of 2012
This report describes and analyses the observations of the brighter or more interesting comets discovered or at perihelion during 2012, concentrating on those with visual observations. Magnitude parameters are given for all comets with observations. Any evolution in the magnitude parameters of those periodic comets with multiple returns is discussed. Additional information on the comets discussed here and on other comets seen or at perihelion during the year may be found on the Section visual observations web pages.
Jonathan Shanklin
Visual measurements of the proper motions of 61 Cygni & Groombridge 1830 using an undriven 10-inch Dobsonian telescope
Results of visual measurements of the proper motions of 61 Cygni and Groombridge 1830, using an undriven 10-inch (250mm) Dobsonian telescope and an astrometric eyepiece, are presented. It is shown that reasonably accurate measurements of the proper motions of these stars can be made visually, using simple equipment, over a period of time that is less than two years.
Nick White
The opposition of Mars, 2010: Part II
In Part II we discuss white clouds and the polar regions. The equatorial cloud band (ECB) was well observed from Ls= 001° onward. The behaviour of the orographic clouds over the great volcanoes was seasonally normal, in the absence of any large dust disturbance. We saw the Tharsis orographics from Ls= 011°, and the Olympus Mons orographic from Ls= 019°. As with the ECB, observations did not continue late enough to establish their seasonal decline. The 2009-’10 N. polar cap recession was followed in detail nearly as far as the summer remnant stage.
Richard McKim