Summer Triangle – Astronomy Now

Track down the Triangle

15 August 2022 Mark Armstrong

The Summer Triangle is arguably the most popular multi-constellation asterism in the entire sky.

See the International Space Station pass overhead from the UK tonight

5 October 2017 Ade Ashford

Urban dwellers may resign themselves to spotting the Moon, planets and the brightest stars with the unaided eye on a clear night, but every so often a bright satellite will catch your attention as it glides silently across the sky. The brightest is the 400-tonne International Space Station (ISS) whose orbit carries it directly overhead as seen from the British Isles and parts of Western Europe tonight.

See asteroid Florence’s close dolphin encounter on 2—3 September

2 September 2017 Ade Ashford

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.

Seeing double in the summer sky

24 June 2017 Ade Ashford

With astronomical twilight lasting all night around the Northern Hemisphere summer solstice for stargazers in the UK, what does the deep-sky observer do when the sky never gets truly dark? Fortunately, there are many beautiful double and multiple stars to seek out while most nebulae are off limits.

See the International Space Station glide over the UK

2 August 2016 Ade Ashford

If you chance upon a bright ‘star’ crawling across the sky in an arc from west to east, an object that doesn’t flash or possess red and green running lights (which is an aircraft), then you can be fairly certain that you’re looking at the International Space Station (ISS). Find out when and where to see it from the British Isles and Western Europe this week.

Seek out the celestial treasures within the Summer Triangle

24 July 2016 Ade Ashford

At the beginning of August, keen observers in the heart of the UK can celebrate the return of truly dark skies around 1am BST. But the naked-eye stars are out by 11pm, and if you cast your gaze two-thirds of the way from southeast horizon to overhead at this time you can see the so-called Summer Triangle in all its glory. Here’s our guide to some of the celestial highlights therein.