Armagh is a partner in two telescope projects whose key goal is to detect the optical counterpart of colliding massive dead stars. Albert Einstein predicted that when two massive objects spiral around each other, eventually merging to become one more massive object, gravitational waves would be emitted. Scientists spent a Read more…
Article by: Mark Grimley To make things a little easier for us to stargaze it will be helpful to head out of town for a bit, somewhere with less light pollution will allow us to see more stars. For those who live in the countryside, this should be easier. Read more…
World renowned astronomical research centre, Armagh Observatory and Planetarium, has co-authored a research paper that announces the discovery of eight new and very hot stars with effective temperatures exceeding 100,000K. Published by the Royal Astronomical Society, the paper* is based on data gathered using the Southern African Large Telescope Read more…
So, party season is over and we’re looking towards a long, cold January before the weather starts to heat up again. However, January is a great time to go stargazing as the nights are long and we can start our lookout in the late afternoon. Not to mention that the Read more…
The story of Jocelyn Bell Burnell’s discovery of pulsars is one of the best known in astronomy. The story of how, as a graduate student at the University of Cambridge, she detected “a bit of scruff” on the chart recorder of the radio telescope designed by her supervisor Anthony Hewish. Read more…
At least one out of four white dwarfs will end its life as a magnetic star! At the end of their life, most of the stars shrink in size to the dimension of a small planet, a stage of the stellar evolution which is called “white dwarf”. In a new Read more…
In a new paper, Simon Jeffery reports the discovery of standing waves on two small hot stars similar to the pattern of jet streams seen in the Earth’s atmosphere.
How astronomy can help us understand the spread of a pandemic Article by Michael Burton, Director of the Armagh Observatory and Planetarium The Hill of Infinity of Armagh, in the Astropark of the Observatory and Planetarium, contains a scale model of the universe, illustrating the place of planet Earth in Read more…
By Simon Jeffery, AOP Research Astronomer In 1930, Dorrit Hoffleit reported that star number #4749 in the Harvard List of variables had faded four times between 1897 and 1929, and identified it as an R Coronae Borealis (RCB) variable. RCB stars are luminous low-mass stars (red giants) with surfaces around Read more…
By Christopher Duffy Studies of the sun, our closest star, have shown that sun spot activity and solar eruptions, also known as solar flares, are strongly correlated – regions of the sun with many sun spots are found to be the typical point of origin for most solar flares. This Read more…
Moving on to our February Night Sky article (already) featuring htings to look out for while the sun still sets nice and early. Watch out for the cold, though!
Lying somewhere between young main-sequence stars and old white dwarfs, hot subdwarfs are blue stars with about half the mass, a tenth the diameter and ten times the brightness of the Sun.
Continuing our weekly instalments outlining astronomy’s impact on your everyday life, we have an article by Jan Mathijs van der Hulst. Thijs is an astronomer, Professor of Radio Astronomy at the University of Groningen, and member of the IAU’s Division B steering committee. Below he outlines how time keeping owes Read more…
There’s lots to look forward to in the Month of May: the evenings are brighter, there’s the promise of good weather and most importantly – not one, but two bank holiday weekends! There’s also lots to look forward to and look out for in May’s night sky. There’s the chance Read more…
While you may be familiar with black holes from sci-fi and many artists’ renditions of the phenomenon, our first actual view of the event horizon of the supermassive black hole which is at the centre of a neighbouring galaxy, Messier 87, was released 4 weeks ago to the day. What Read more…
Looking up at the wonders of the night sky is an amazing pastime, and whether you use a telescope or binoculars all you really need is the naked eye, but remember to give your eyes at least 20 minutes to adapt to the dark to ensure that you can see Read more…
Article by: Gavin Ramsay Unlike our Sun, around half of all stars have another stellar companion. The closest stars to the Sun are two bright southern stars, alpha Centauri A and B, which orbit each other every 80 years and Proxima Centauri which orbits A and B every few tens Read more…
Before addressing Black Hole sizes, we should first go back to see what astronomers mean when they use the term “Black Hole”. This may be easiest to understand when considering the end products of stars.
Article written by: Heather Alexander, Education officer At the Armagh Observatory and Planetarium we have been having a look at all the things that are going to happen throughout the year and trying to select some of the events that we are most looking forward to. Needless to say this Read more…
Here we are, on the count down to Christmas, and we’re having a look at all the Astronotes that have been written for our blog this year. We’ve had input not just from the Education Team this year, but also the Academic Staff of the Armagh Observatory and Planetarium.
The long cold dark nights have well and truly settled in, and now that it’s December it’s officially acceptable to say the C word. Christmas, Christmas is coming! And so is Santa Claus! Decorations are going up, there’s mad panic to buy Christmas presents and families are organising who’s having dinner and where. Ahh I love this time of year.
NASA has announced the retirement of the Kepler spacecraft. After launch in March 2009, it began a continuous observation of a 115 square degree field of view (the diameter of the moon is 1/2 a degree) between the constellations Cygnus and Lyra.
The discovery of planets orbiting around other stars has been one of humankinds greatest achievements. The existance of these ‘exo-planets’ can challenge our perception of our place in the universe. Since the first confirmed detection of a planet around another normal star (51 Peg) in 1995, many thousands of planets have been discovered. Indeed, it is likely that most stars will have their own system of planets. It is important in answering the question – is there intelligent life out there?
Have you ever been worried about the impact of an asteroid wiping out human life? Well, I have some disturbing news for you: there is another possibility involving the explosion of a massive star that gives rise to a gamma-ray burst (called by astronomers simply a GRB), when the star ends its life producing a black hole.
September 2018 will see over 50 astronomers from around the world gather at the Armagh Observatory and Planetarium to discuss the latest news about hydrogen-deficient stars. These stars have lost nearly all the hydrogen from which they were made, to leave only nuclear ash. Astronomers want to learn how these rare and short-lived remnants formed, and what drives their spectacular changes in brightness.
July 4, 2018 saw the 150th birthday of Henrietta Swan Leavitt (1868 – 1921), one of the most important astronomers of the 20th century. Born in Lancaster, Massachusetts, Leavitt graduated from Radfcliffe College, Harvard, in 1892. She then stayed on at the Harvard College Observatory as a volunteer research assistant. Whilst attempting a graduate degree in astronomy and travelling in Europe, she became ill with grave consequences for her hearing. In 1902, then director, Edward Pickering, invited Henrietta to join the permanent staff at Harvard, where she was assigned to study “variable” stars.
This article has been inspired by the many questions we get asked here at the Armagh Observatory and Planetarium. We love being asked questions but we thought it would be funny to have a look at the questions you really should never ask an Astronomer. We hope this gives you a bit of a laugh!
Approximately every other star in the Milky Way galaxy is in a ‘binary’ system. These binaries are made up of two stars orbiting around a common centre of gravity. The time taken for the stars in the binary to make one revolution is called the ‘orbital period’. Binaries have a wide range of orbital period. The closest stellar system to the Sun is alpha Centauri which has two stars not unlike our Sun orbiting around one another every 80 years. A third member of the system, Proxima Centauri, which is much smaller red dwarf star, orbits around these two stars once every 10,000 years.
Article by Jorick Vink , Astronomer at the Armagh Observatory and Planetarium When you are fortunate enough to have a clear view of the night sky, and you start wondering about the properties of all these sources of light, you might be amazed to find out all these stars have Read more…
Article by: Holly Preece, PhD student at the Armagh Observatory and Planetarium NASA’s Hubble space telescope was launched on 24th April 1990. It was the first optical space telescope to be launched into orbit and has been one of the most productive scientific instruments ever built. It orbits the Earth Read more…
Article by Aaron Golden, Visiting Astronomer at the Armagh Observatory and Planetarium Stephen Bourke works at the Department of Space, Earth and Environment, Onsala Space Observatory in Sweden, and Aaron Golden at the School of Maths in NUI Galway, and is a visiting astronomer at the Armagh Observatory and Planetarium. Read more…
Recent observations of the helium star HD144941 have been obtained from space. Armagh astronomers Professor Simon Jeffery and Dr Gavin Ramsay have discovered that they show a light curve best explained by darker and lighter patches on the star’s surface coming into view as the star rotates with a period Read more…