Observing the night sky
Observing the Night Sky
Whether you're stepping outside for the first time or just getting started with a pair of binoculars, the night sky has plenty to offer. These suggestions are for those new to astronomy who are not yet confident in what to look for, or in finding their way around.
Finding Your Way Around
A sky chart is a great starting point — use it like a road atlas for the heavens. There are several good printed charts available, and a range of free and low-cost apps that will show you exactly what's overhead in real time simply by pointing your phone at the sky. Popular choices include Stellarium, SkySafari and Star Walk.
All the stars you can see with the naked eye belong to our galaxy, the Milky Way. On a clear, dark night you may even be able to see the faint band of the Milky Way stretching across the sky.
When to Observe
You'll see much more when the Moon is either out of the way or up to half full. The best nights for observing are around the new moon, when the sky is at its darkest. Allow your eyes at least 20 minutes to fully adjust to the dark — avoid looking at bright screens during this time, or use a red light torch to preserve your night vision.
Five Targets Worth Finding
These targets are ideal starting points — most are visible with the naked eye or a pair of binoculars, and all are rewarding for first-time observers.
(1) The Moon — the perfect first target. Even a basic pair of binoculars reveals craters, mountain ranges and ancient lava plains in remarkable detail. No two nights look quite the same as the shadows shift with the lunar cycle.
(2) The Pleiades (M45) — a beautiful open star cluster in Taurus, easily visible to the naked eye and stunning through binoculars. Look for the tight knot of blue-white stars, sometimes called the Seven Sisters.
(3) The Orion Nebula (M42) — visible to the naked eye as a fuzzy patch in Orion's Sword, just below the three stars of Orion's Belt. Binoculars reveal a glowing cloud of gas where new stars are currently being born.
(4) The Andromeda Galaxy (M31) — the most distant object visible to the naked eye, sitting around 2.5 million light-years away. From a reasonably dark site it appears as an elongated misty patch. What you are seeing is a galaxy containing around one trillion stars.
(5) The Double Cluster in Perseus (NGC 869 & NGC 884) — two neighbouring star clusters sitting side by side, best appreciated through binoculars. A spectacular sight and straightforward to locate using a sky chart or app.
About Globular Clusters
As your confidence grows, globular clusters make a fascinating next step. These ancient, densely packed balls of stars orbit in a halo around our galaxy, held in place by gravity. They are among the oldest structures in the universe — M13 in Hercules, for example, contains around 300,000 stars and is estimated to be nearly 12 billion years old. A small telescope will begin to resolve individual stars around the edges, which is a genuinely impressive sight.
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If you are a Member of RAG go to the Members Corner for further guidance, and more targets.