This month brings the excitement of a comet hunt, as Wirtanen 46P reaches closest approach on December 16th. This is a relatively small comet (1.5km across) with a period of just over 5 years. However Wirtanen is known to produce a relatively large tail for its stature, so it’s definitely one to look out for. In mid December it’ll be positioned between the Pleiades star cluster and red giant star Aldebaran in Taurus, so will be relatively easy to locate in the night sky.
Reports of naked eye sightings and some photographs are already emerging online despite the current low altitude of the comet at high norther latitudes. However its vantage will steadily improve as we head into mid December, although Moon conditions will become less favourable then, so time your hunt well.
Wirtanen should be observable in a wide-field telescope or binocular view, and possibly naked eye under very dark conditions. You could also try locating it by taking a 10-30 second exposure in your DSLR camera.
I’ve put together a short video to help you locate it over December. Clear skies!
In 1054AD Chinese astronomers recorded a bright new star suddenly appear in the constellation Taurus the bull. It brilliantly out shone all other stars and was visible in broad daylight. After a year or so its light faded and it vanished.
The event was a supernova explosion – the dramatic explosion of a massive star. Today we can see the remnants left behind from this violent event – the Crab Nebula. An expanding shockwave of recycled stellar material. The above amazing image is from the Hubble space telescope.
You can see the Crab Nebula in a modestly sized amateur telescope, and as always the darker the skies the more detail you’ll see. With a 150mm scope or larger you should be able to trace out the overall mottled shape of the nebula. Use averted vision and see if you can pick out extra detail and structure.
Finding the Crab is relatively straightforward as it sits just beside the lowest horn of the constellation Taurus the bull, which sits above and right of Orion during evening skies at the moment.
You can see three excellent examples of open star clusters within the Orion and Taurus constellations, all in one convenient direction during winter skies (looking south or south east) and in a rough line drawn out by Orion’s belt.
Start with the Orion nebula (M42), below the three belt stars in Orion. This star forming region contains a very young open cluster called the Trapezium which is surrounded by glowing clouds of ionised hydrogen gas. You can see this nebula in binoculars but it looks best in a low or medium power telescope eyepiece.
Moving up into the eye of Taurus to the red giant star Aldebaran, we find the Hyades cluster. Aldebaran is like a premonition of the fate that awaits out own sun. A red giant around 7 billion years old, bloated and shuddering in its final gasps before it collapses down to a white dwarf. Shining brightly all around Aldebaran are the members of the Hyades open cluster (although they are much further away) – quite a mature cluster at around 500 millions years old. Best viewed in binoculars.
And finally moving higher and to the right we find the Pleiades, a lovely jewel box of middle age hot stars (and many less bright members) slowly drifting apart to join the general distribution of stars. When the dinosaurs roamed the earth this cluster would have resembled the Orion nebula – bright and nebulous, its hot infant stars lighting up the surrounding hydrogen gas clouds.