Sky Notes: 2018 June & July
The Summer Triangle takes the stage, and can be used as a pointer to many objects.
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Data Protection & Security
The BAA takes Data Protection & Security very seriously and complies with all applicable legislation. Check your rights and the BAA’s conformity with the GDPR here.
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Obituary: John Wall (1932−2018)
John Wall was born in Crayford, Kent on 1932 June 26. Within a year the family moved to Dartford where
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Obituary: Michael J. Hendrie (1931−2018)
With the death of Michael Hendrie at the age of 87, the Association has lost one of the great classical
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The dark nebulae of summer
Although summer nights are short, there can still be great astronomical sights, especially if a dark and more southerly location
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A previously unreported naked-eye sunspot observation: 1604 November
Evidence is presented of a previously unreported naked-eye sunspot observation in 1604. A report from a 17th century Hungarian history is analysed and possible alternative interpretations are discussed. Further evidence of high solar activity at the time is briefly examined.
Read moreRZ Cas lightcurve and orbital period variations
A binary star model for RZ Cas is fitted to a set of high quality electronic magnitude observations of recent minima, deriving in the process some of the parameters of the system. This lightcurve is then fitted to raw observational data from the BAA, AAVSO, AFOEV and VSOLJ in order to determine the times of minimum. These observed times of minimum supplemented by data from the Lichtenknecker database are then compared to expected times and are shown to be consistent with several significant long-term changes in the period.
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