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The Journal of the British Astronomical Association, 2017 December

Volume 127, Number 6

Don’t miss Tim Haymes & Alex Pratt’s report on the recent occultation by Triton, seen from the UK by at least 11 observers, and from elsewhere on the track by many more. Jon Shanklin fills us in on the prospects for next year’s comets, and Peter Birtwhistle imaged the so-called ‘interstellar asteroid’ A/2017 U1 from his home observatory at magnitude 22....

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Selected highlights from this Journal:

Notes and News

From your new President
Callum Potter
Comet prospects for 2018
Jonathan Shanklin

Refereed Papers

Saturn, 2003-2004
During 2003-’04, with Saturn at perihelion, the rings were fully open upon the south face allowing excellent views of the southern hemisphere and up to 12 belts. Since 2002-’03 there had been an obvious darkening of the S. Polar Region, though the existing lighter area in the centre of the S. Polar Cap had become more conspicuous. Spot activity was noted over a wide range of latitudes from the N. edge of the S. Polar Cap to the southern Equatorial Zone. The occultation of the star SAO 78867 by the rings and globe was witnessed by several observers in the UK and USA.
Richard McKim
A lunar dome north-east of the crater Goclenius
In this study we examine a lunar dome identified using CCD terrestrial images, LROC WAC images, Clementine multispectral data, Chandrayaan-1’s Moon Mineralogy Mapper (M3), and the LROC WAC-based GLD100 DTM. The dome lies to the north-east of the crater Goclenius, in mare Fecunditatis, and has a base diameter of 35km. Its height amounts to 212m and the average slope angle x corresponds to 0.70°.
Raffaello Lena, Jim Phillips & Paolo Lazzarotti
The dialyte refractor revisited
By embracing 21st century design technology, the dialyte telescope concept now offers apochromatic performance using inexpensive glass types, with the benefits of low cost, very light weight, rapid cool-down times, and atmospheric dispersion control. Much larger apertures than with traditional technologies are now feasible.
Peter Wise
The brighter comets of 2011
This report describes and analyses the observations of the brighter or more interesting comets discovered or at perihelion during 2011, concentrating on those with visual observations. Magnitude parameters are given for all comets with observations. Any evolution in the magnitude parameters of those periodic comets with multiple returns is discussed. Additional information on the comets discussed here and on other comets seen or at perihelion during the year may be found on the Section visual observations web pages.
Jonathan Shanklin