Sky Notes: 2019 April & May
Brian highlights the Sombrero Galaxy and some fine Globulars for these notes
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Archives
The deep-sky delights of Hydra
Hydra, the water snake is – rather appropriately – a sprawling constellation of the spring sky, covering almost six hours
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Record fade of variable star SV Sge
RCB stars are extremely rare, hydrogen deficient, carbon rich giant stars whose luminosity varies in two ways – small amplitude
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Noctilucent cloud over Britain & Western Europe, 2017
A summary by the Assistant Director of the Aurora & NLC Section of noctilucent cloud (NLC) activity during the 2017 season.
Read moreJupiter’s North Equatorial Belt & Jet: II. Acceleration of the jet & the NEB fade in 2011–’12
Paper I described the normal features of the North Equatorial Belt (NEB) in recent years. This paper describes an exceptional set of apparently coordinated changes which occurred in 2011–’12, after more localised precursors in 2008 & 2010. The large dark formations on the NEB southern edge (NEBs) progressively disappeared until none remained. In the sectors of NEBs thus vacated, smaller dark features all moved with unprecedented ‘super-fast’ speeds, which were modulated by the few normal features while they lasted before accelerating further. These changes have several profound implications for understanding the dynamics of the region.
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