Noctilucent cloud over Britain & Western Europe, 2020
A report of the Aurora & Noctilucent Cloud Section. Director: S. Brantingham. Noctilucent cloud (NLC) forms in the mesosphere at
Read moreA report of the Aurora & Noctilucent Cloud Section. Director: S. Brantingham. Noctilucent cloud (NLC) forms in the mesosphere at
Read moreThe 37th report of the Jupiter Section. Director: J. H. Rogers. At the previous opposition of 1949 there had been
Read moreA report of the Mercury & Venus Section. Director: P. G. Abel This paper covers observations of Venus made during
Read moreThis is the second of two papers in which, together, 28 previously unrecognised cases of probable aurorae seen in the
Read moreA report of the Variable Star Section. Director: J. Shears. We present the light curve of the old nova
Read moreThe Montes d’Alembert are a chain of mountain peaks found along the western lunar limb. The individual mountains were grouped
Read moreIn this study, we examine four lunar domes located near the crater Lavoisier K. The large domes, termed Lavoisier 1–3,
Read moreThis is the first of two papers in which, together, 28 previously unrecognised cases of probable aurorae seen in the
Read moreAn indicative unfiltered light curve has been generated for the protostar R CrA. During the period 2018 May to 2020 November, the variability was seen to be substantial (11.5–13.1), but only weakly compliant with the 65.7-day variability generally attributed to R CrA. The star illuminates the fan-shaped NGC 6729 nebula. Variability in the nebula was observed to begin close to R CrA and then move steadily down the fan, fading as it progressed. Measurements of the surface brightness of the different parts of the nebula showed an apparent relationship in the delay between brightening of R CrA and the subsequent brightening of parts of the fan. These variations appear consistent with light echoes.
Read moreUntil now there has never been a comprehensive account of Jupiter’s 1949 apparition, in which there was a Revival of the South Equatorial Belt (SEB). On opposition day, Jul 19, despite the SEB south component not having faded to invisibility, the first white spot of the Revival was seen. The spot had originated within a pre-existing SEB(S) dark ‘barge’, close to the longitude of E. J. Reese’s ‘Source B’. The Revival led to a fading of the initially conspicuous Great Red Spot (GRS), and the development of the Red Spot Hollow (RSH). The S. branch of the Revival was weak, with small retrograding dark spots which failed to pass the GRS, although their velocity was typical. The N. branch was also less active, with some prograding dark spots passing only slightly beyond the GRS/RSH, which also exhibited a typical drift. On the other hand, the central branch was unusually active, with a succession of long-lived white spots and dark columns (mean drift rate Δλ2 = –67°/30 days). The p. end of the Disturbance in …
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