Absolute Beginners No 13. The Pole Star
The Pole Star
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Archives
Sky Notes: 2018 August & September
Brian suggests looking for the prominent globulars in Hercules, M13 and M92
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The globular clusters of Ophiuchus
Globular clusters are fascinating objects and summer and early autumn, when our southerly view is towards the galactic centre and
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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.
Read moreVisual 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.
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