At this time of year we are starting to get proper dark skies again which are not affected by twilight. A week ago on the 29th July we had some clear skies up until just gone midnight and from then until about 2am (BST) twilight was absent. The moon was also only one day past new.
I was able to make some more observations of the variable stars CH Cygni, AC Herculis, Z and RY Ursae Majoris. Here is a brief summary of my observations using my 7x50 binoculars:-
- CH Cyg. 22:10 UT. Estimated to be fainter than A but brighter than W - A(1)V(3)W, mag. 6.7
- AC Her. 22:42 UT. Estimated to be fainter than C but brighter than D - C(1)V(1)D, mag. 7.2
- Z Uma. 23:14 UT. Estimated to be about the same brightness as L - =L, mag. 8.9
- RY UMa. 23:29 UT. Estimated to be fainter than 2 but brighter than 4 - 2(1)V(1)4, mag. 7.6
A little while after this the sky clouded up which seems to be the story of recent months. There doesn't appear to be any major discrepancies between my observations and those of other observers.
All text and images © Duncan Hale-Sutton 2022
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