Click on the image to read an extract of the book “A Breathtaking Window on the Universe: A guide to the observatory at the Roque de Los Muchachos” on sale December. The recommended retail price is €15, but books bought through the publisher’s website will cost just 12€ + P&P.
Modern telescopes have mirrors made of a material called vitro ceramic, which keeps its size and shape in spite of changes in temperature, covered with a very thin layer of aluminium. Domestic mirrors have glass in front of the aluminium, to protect it, but that means that the light passes through the glass twice – coming and going – which degrades the image. So telescope mirrors have the aluminium…
Yesterday the maintenance team took the tertiary mirror out of the huge GranTeCan telescope, and I was invited to take photos. (Starlight hits the huge primary mirror first, then bounces up to the smaller secondary mirror at the top of the telescope, then back down into a tube called the baffle to the flat tertiary at 45º, which sends it to the scientific instruments at the sides. The tertiary is elliptical, and…
The HARPS-N spectrograph was inaugurated on April 23rd. Here’s some photos. This write up is better late than never, I hope.
The William Herschel Telescope was for many years the biggest and best optical telescope in Europe (until GranTeCan opened in 2009). The main mirror is 4.2 m across (165″, or 13′ 9″) which astronomers call “a good light bucket”. It’s rather old as world-class telescopes go, since it opened in 1987, but it still produced excellent science. In fact data from the WHT has been used for about 1,500 scientific…
In all my 11 years of working at the Roque as a software engineer, I never visited the Nordic Optical Telescope. We used to joke that it was NOT one of ours. And in two years of tour guiding up there, I never went in either. It was NOT on my programme. But now I’m writing an e-book about the observatory, and it’s NOT a good idea to write about…