Observing

Watch asteroid 2014 JO25 brush by Earth on 19 April

17 April 2017 Ade Ashford

A peanut-shaped asteroid almost a mile long known as 2014 JO25 passes within 5 lunar distances of Earth on 19 April — the closest any known space rock of this size has approached our planet since September 2004. We show you how to find this fast-moving potentially hazardous asteroid in small telescopes during the UK night of 19-20 April.

Observing

Halloween near-Earth asteroid 2003 YT1 has Polaris encounter on 2 November

31 October 2016 Ade Ashford

At 9:24am GMT on 31 October 2016, near-Earth asteroid 164121 (2003 YT1) will safely fly by at a distance of 3.2 million miles (5.2 million kilometres), or 13.5 times the distance of the Moon. Furthermore, this 1.1-mile-(1.7-kilometre)-wide Apollo asteroid also passes very close to Polaris early on 2 November, creating a rare astrophotographic and observing opportunity.

News

Mystery of disappearing asteroids solved

18 February 2016 Astronomy Now

Ever since it was realised that asteroid and comet impacts are a real and present danger to the survival of life on Earth, it was thought that most of those objects end their existence by plunging into the Sun. But a new study finds instead that most of those objects are destroyed in a drawn out, long hot fizzle, much farther from the Sun than previously thought.

News

NASA’s Fermi finds hints of gamma-ray cycle in active galaxy

14 November 2015 Astronomy Now

Astronomers using data from NASA’s Fermi Gamma-ray Space Telescope have detected hints of periodic changes in the brightness of a so-called “active” galaxy, whose emissions are powered by a supersized black hole. If confirmed, the discovery would mark the first years-long cyclic gamma-ray emission ever detected from any galaxy, which could provide new insights into physical processes near the black hole.