The visibility of the Southern Cross from Britain
This paper considers past and future appearances of the southern constellation of Crux in the skies of Britain.
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Archives
The North Polar Hood of Mars
The southern boundary of Mars’ North Polar Hood (NPH) was measured from 585 Earth-based images made between 2001 and 2016. This analysis covers the late summer, autumn and winter seasons for Mars’ northern hemisphere.
Read moreA method for deriving Cousins R magnitudes from UCAC4 data
We describe a method for deriving Cousins Rc magnitudes from r, B, and V stellar photometry in the UCAC4 catalogue, valid in the range 9 < Rc < 16. The source of the majority of UCAC4 reference star photometry is the AAVSO Photometric All-Sky Survey (APASS) catalogue. Version 433 of the software Astrometrica is updated so that, provided the UCAC4 catalogue is selected as the reference, Rc magnitudes are calculated using our derived transformation, namely: Rc= r – 0.108(B–V) – 0.132.
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James H. Worthington (1884−1980): A quest for totality, observatories & Martian canals
James Henry Worthington became a prominent amateur astronomer during the years preceding the Great War, mainly because of his expeditions to distant solar eclipse tracks and observatory sites, but also because of his interest in the Martian ‘canals’ and his friendship with Percival Lowell. Just prior to the start of the War he built a major observatory at Four Marks in Hampshire, which he generously invited BAA members to use whenever they wished, at least until he moved permanently to the USA.
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Absolute Beginners no.14: Astronomical ‘seeing’
IntroductionWhat makes for a really good night of observing? An obvious answer is that the skies should be clear, but
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A compostable wrapper for your BAA Journal
All being well, members who receive their Journal through the post should have noticed something rather different about this issue.
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