Observers in the UK and Western Europe should find an observing location offering an unobscured eastern horizon an hour before sunrise on Sunday, 10 September to see innermost planet Mercury just 0.6 degrees from Regulus, the brightest star in Leo. Conspicuous planet Venus is your convenient celestial guide to finding Regulus, Mercury and Mars.
In a typical year, there are around 50 novae, nuclear explosions on the surface of white dwarf stars, in our galaxy. Some of these explosions are so bright and powerful, they exceed the scale of scientific explanation. Employing two powerful telescopes, astronomers at Michigan State University have proven a theory that explains these super-luminous novae and other astronomical explosions.
During the first week of September, observers have an opportunity to see a bright near-Earth asteroid known as 3122 Florence (aka 1981 ET3) as it sails by our planet. On the night of 2—3 September, observers in the UK and Western Europe can see this 4.4 kilometre-wide space rock pass through a prominent asterism in the constellation of Delphinus, the dolphin.