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Archives

Figure 1. O−C plot for all eclipses of HS 2325 with respect to the linear ephemeris in Equation 1. Published eclipse timings are in black, those by the author in red.

Evidence of abrupt changes in the orbital periods of

We report evidence from eclipse timing that two otherwise apparently normal cataclysmic variables have experienced abrupt changes in their orbital

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Four views of Jupiter, labelled A to D. A and D are colour photographs, while B and C are black and white sketches.

The opposition of Jupiter, 1953–’54

No BAA report for Jupiter in 1953–’54 has previously appeared. The apparition of 1952–’53 had been one of great activity,

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A light curve, for illustrative purposes (labels not legible)

A 6.65-day pseudo-periodicity in OJ 287’s flaring in 2023 Mark Kidger

Since they were discovered in the early 1960s, quasars have posed many problems for astrophysics. It is now generally accepted

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Photometry of low-amplitude slow rotators: the Hilda-group asteroid (1269) Rollandia

Photometry of images of asteroid (1269) Rollandia taken by seven observers at its 2018–’19 apparition has been performed using Astrometrica

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Two black-and-white images of the planet, with the axis or rotation aligned left to right. Belts, including a darker equatorial region, are well seen.

Uranus during the 2016 apparition

A report by the Uranus Coordinator of the BAA Saturn, Uranus & Neptune Section (Director: Mike Foulkes) This report describes

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In the centre-band image, filaments and bright plage is more clearly seen; the flare appears bright against the dark umbrae and penumbrae of the active region

Observations of a major solar flare, revisited

Hydrogen-alpha observations of a major flare from 2003 November are revisited.   Introduction 2023 November marks the 20th anniversary of

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The brighter comets of 2020

A report of the Comet Section (Director: N. D. James) This report describes and analyses the observations of the brighter

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A chronology of some lunar drawings by Galileo Galilei

By taking into consideration the morphological features along the terminator in some of Galileo’s watercolour portraits of the Moon, found

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Noctilucent cloud over Thurso in Scotland, with silhouetted house in foreground

Noctilucent cloud over Britain & Western Europe, 2022

Noctilucent cloud forms in the mesosphere at an altitude of about 83km and appears annually in northern latitudes between the

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A colour image of the variable reflection nebula NGC 6729, taken by Terry Evans. It appears blue-ish, with some black absorption nebulosity occluding also visible and occluding the background stars

Brightness variations in R CrA & NGC 6729 during 2021

An indicative luminance light curve for R CrA created from data collected during 2021 showed a brightness range between magnitudes

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