A comet that passes by earth "once every 71 years" is currently visible in the night sky but what is the best way to see it?

Astronomers say 12P/Pons-Brooks is growing brighter and there is a possibility sky gazers will be able to see it with the naked eye in the coming weeks.

It is named after its discoverers Jean-Louis Pons and William Robert Brooks, and spends most of its time in the outer reaches of the Solar System, where it is very cold.

It comes back to the inner Solar System every 71 years and is, hence, known as a periodic comet.

12P/Pons-Brooks has already had several outbursts of activity, raising its brightness periodically, according to Dr Megan Argo, an astrophysicist at the University of Central Lancashire.

She added: “If we’re lucky, it may have another in the next few weeks as it passes through the sky.”

What are comets made of?

Comets are celestial objects mainly made up of dust, rock and ice.

Dr Argo said: “You can think of them as a bit like giant dirty snowballs.”

Dr Argo explained that as the comet gets close to the sun, the heat causes the ice to melt straight to gas – through a process called sublimation – and some of the material is lost from the surface.

She said: “This gas forms both a cloud around the solid nucleus of the comet – known as the coma – and a tail of material that can stretch many millions of miles in space.

“The tail is made of gas and dust that has been pushed away from the comet by the power of the solar wind streaming from the Sun, and this tail is the bit that can become spectacular in the sky as seen from Earth.”

Dr Argo mentioned that while 12P/Pons-Brooks is developing a nice tail, it is “not quite visible without binoculars or a telescope just yet”.

For those looking to spot the comet, it is below and slightly to the left of the Andromeda galaxy.

How to see 12P/Pons-Brooks comet in the sky

Currently, it’s thought star gazers can see 12P/Pons-Brooks using binoculars or small telescopes.

Stuart Atkinson, an amateur astronomer based in Cumbria, has been tracking the object for some time, taking photos on his Canon 700D DSLR camera.

He said that, technically, 12P/Pons-Brooks should be visible to the naked eye now but “in reality, it needs a pair of binoculars or a telescope to be seen because most people live in places with light pollution”.

Echo: Have you ever seen a comet passing by earth?Have you ever seen a comet passing by earth? (Image: Jacob Powers/Getty Images)

Mr Atkinson, who has written 14 books on astronomy, went on to say: “Over the next few weeks or so it will brighten a little more, but the Moon is in the sky now, and its brightness will dim the comet.”

He said the best way to see the comet is to find a place with dark skies and no tall trees, buildings or hills to block the views.

He added: “You’ll need binoculars to see the comet, and even then it will only look like a smudgy star with a hint of a tail behind it.

“Luckily there’s a bright planet quite close to it – Jupiter – so if you pan your binoculars to the right of Jupiter, very slowly, that will help.

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“People think comets whoosh across the sky, like shooting stars, but that’s not true, they only move a small amount each night, so the comet will be in the sky for a while yet.”

For those wanting to take photos, Mr Atkinson advises using a DSLR camera on a tripod or a telescope.

He commented: “The comet is too small and too faint to be picked up by phone cameras, unless you use the special ‘night mode’ or an astrophotography app, and even then it is so small it will be hard to image with a phone camera.”