top right – Page 2 – British Astronomical Association

Four images of Jupiter, arranged in a square: these are yellow and blue (top left and right), red (bottom left) and RYB (bottom right). Key feaures are described in the caption.

The opposition of Jupiter, 1955–’56

During the previous apparition, there was a weak Revival of the South Equatorial Belt. This was followed during 1955–’56 by

Noctilucent cloud over Loch Lomond. The clouds appear electric blue, bright against a dark sky which graduates to an orange glow above the mountainous horizon. Waves on the Loch's surface are in the foreground.

Noctilucent cloud over Britain & Western Europe, 2023

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

A plot of (B-V) (x-axis) against (U-B) (y-axis), with fitted curves corresponding to the locations on the plot of cluster members (represented with scatter points). The fits decrease at low (B-V), level off in the middle, then decrease more steeply again.

A free, Excel-based application for UBVIc photometric studies of galactic open clusters

Due to their discrete brightness and uncrowded appearance, open clusters are accessible to many amateur instruments. Moreover, their photometric study

Lunar domes near the crater Cleomedes

The Nectarian-aged Crisium basin is characterised by prolonged lunar volcanism ranging from the Imbrian age to the Eratosthenian period. In

A rare outburst of the WZ Sge-type dwarf nova PQ Andromedae

A report of the Variable Star Section (Director: J. Shears) We present a light curve of the 2020 outburst of

The nightside of Venus visible next to the crescent of its illuminated hemisphere; this photo was taken in infrared

The 2022 western elongation of Venus

A report of the Mercury & Venus Section (Director: P. G. Abel) Analysis of the observations made by Section

A photograph of the bearded Brorsen, sitting in a chair with arms folded

The tortuous discovery of the Gegenschein, false zodiacal light & zodiacal band – Brorsen vs Jones

It is routinely thought that Brorsen discovered the Gegenschein and zodiacal band in 1854. Here, it is argued that priority

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

The telescope array - appearing as six white telescope tubes on a single mount - are poised towards the sky in twilight

Condor reveals a second eruption shell of the dwarf nova

Z Cam is a cataclysmic variable star whose visual magnitude varies between 10 and 14. This system is the prototype

A new outreach discussion forum

Just launched, AstroMailbox is a new astronomy communicators’ e-mail discussion list which brings together anyone interested in astronomy outreach. It