Search Publications
Photometry & spectrophotometry of the Herbig Ae star RR Tauri
Boyd, D.
Multicolour broadband photometry and flux-calibrated low-resolution spectroscopy, obtained between 2014 & 2018, are used to investigate the behaviour of the highly variable Herbig Ae star RR Tauri.
The eastern & western elongations of Venus, 2007-'17. I. The sunlit hemisphere
McKim, R. J.; Abel, P.; Leatherbarrow, W. J.
Fourteen successive morning and evening elongations of Venus from 2007-2017 are reviewed. The work of 153 observers covered the time period of ESA's Venus Express and Japan's Akatsuki missions, and wavelengths from 335-1750nm. The instantaneous rotation period of the ultraviolet markings was studied as a function of latitude, and the results compa…
New measurements and analysis of the Beta Cephei star V909 Cassiopeiae
Boyd, D.; Koff, R.
V909 Cas is a little-studied example of a Beta Cep pulsating variable star, located in the OB association Cas OB8 in the Perseus spiral arm of the Milky Way. Photometric observations in 2016-'17 provided thirty new times of pulsation extrema and enabled its mean pulsation period to be determined as 0.2067798(1)d. From spectroscopic observations we…
The brightness of comet 67P/Churyumov-Gerasimenko
Shanklin, J.
Comet Section records of 67P/Churyumov-Gerasimenko have been analysed to catalogue the comet's behaviour over previous visually observed apparitions. Predictions are made for future returns.
Great White Spots on Saturn: current and historical observations
McKim, R. J.
The bright spot in Saturn's North Tropical Zone which developed in 2010 December prompted the writer to collect together some rare and unpublished observations of previous Great White Spots (GWS) on the planet. As illustrated by series of observations in 1876, 1933 and 1990, and for 1903 and 1960, these GWS show a tendency to recur at intervals of…
White clouds on Io?
Rogers, J. H.
This paper reports rapid changes in the distribution of bright white patches in one region of Io, close to the subjovian point and the caldera Karei Patera. A stable pattern of white patches in this region was recorded by Voyager in 1979. A strikingly different pattern was shown in the first Galileo-G1 image (1996 June). However, the patterns in a…
The comet collision with Jupiter: III. The largest impact complex at high resolution
Rogers, J. H.; Miyazaki, I.; Limaye, S. S.
Comet fragments D, G, R, and S all impacted on Jupiter within an 180 range of longitude, and produced a single great dark complex. Using high-resolution maps derived from Hubble Space Telescope and ground-based images, we compile a continuous record of this complex. Many dark spots and streamers developed within it. They did not follow the normal …