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December 2018, December Night Sky, Night Sky

December 2018 Night Sky Guide

December 2018 Night Sky – December is a fantastic month for stargazing, especially in 2018. The nights are long and dark. With darkness falling late afternoon/ early evening and sunrise later in the mornings. December has cold dark nights heralding fantastically clear night skies. As long as the clouds stay away and the skies are clear!

There are some fantastic sights to see in December 2018’s night sky. So read on and lets see what you can see…


Evening Planets

In the evenings early on in the month, you can just glimpse Ringed Planet Saturn. Saturn will be briefly visible just after sunset low in the west. It will be lost completely in the light of sunset the rest of the month.

Mars is still quite prominent in the south. However, it’s lost a lot of its brightness compared to when it was at its best in the summer. The Red Planet will start December 2018 in the constellation of Aquarius. It will slowly move eastwards into Pisces during December. The planet will continue to lose brightness throughout the month.

Uranus and Neptune are visible in December 2018 to those with good binoculars or a telescope. Uranus can be found in the constellation of Aries and Neptune can be found in Aquarius. Detailed star charts will pinpoint their positions.

On December 7 Mars and Neptune will have a very close encounter. This encounter will only be visible in a telescope or high power binoculars. The two planets will both be visible in the same telescope field of view due to their apparent close proximity to each other.

Artist impression of view in Celestron Skymaster 15 x 70 binoculars left and as seen in large amateur Telescope with 26mm eyepiece right. (Not to scale)


Morning Planets

Venus is at its best in December 2018 before sunrise! At the beginning of the month, Venus will shine at a very impressive mag -4.9. Venus will be the brightest thing in the sky bar the Sun and the Moon. Venus will dim slightly to mag -4.7 toward the end of December- still incredibly bright. The planet is visible from approximately 4am to 8am in the UK during the month. You can find out more about Venus and what to expect to see for the next few months here.

Mercury is visible just before sunrise early in December 2018. The tiny Planet reaches greatest elongation (furthest point to the west of the sun) on December 15. Mercury and Jupiter have a close encounter later in the month – See below.

King of the Planets Jupiter pops out from behind the sun mid month. It travels west in the mornings of December 2018 with a close encounter with Mercury on the mornings of December21/ 22. A good photo opportunity.

Mercury and Jupiter close encounter with Venus top right December 21. Credit Stellarium

The Moon in December 2018

MoonPhases (UK)

New Moon occurs on the 7th at 07:20 GMT.

First Quarter occurs on the 15th at 11:49 GMT.

Full Moon is on November 22nd at 17:48 GMT.

Last Quarter occurs on the 29th at 09:34 GMT

A Full Cold Moon

The name given to December’s Full Moon in folklore is the “Full Cold Moon”. It is also known as the Moon Before Yule if you follow Old English/ Saxon traditions. Unlike some other Moon names, the Full Cold Moon is fairly self explanatory as it occurs in the cold of December night sky. Occasionally you may also hear it referred to as the “Long Night’s Moon”. This is because this Full Moon falls in the month with the most hours of darkness. In December 2018 the Full Moon occurs a day after winter solstice – the longest night of the year.

Lunar Encounters – Events worth getting the camera out for

In the morning of December 3, the 12% illuminated Crescent moon forms a triangle with Venus and bright star Spica.

The Crescent Moon, Venus and Spica in the night sky December 3 before sunrise. Credit Stellarium

Early in the evening on December 8, the thin crescent moon comes roughly within 1° of Saturn before sunset.

December 14, close approach of the 1st quarter moon and Mars – Very close to the peak of the Geminid Meteor Shower. Look out for meteors!

On the evening of the 24th – Christmas Eve, the near Full Moon will pass close to the Beehive Cluster or Praesepe in Cancer. This may be a tricky encounter to resolve due to the near Full Moon washing out the December night sky.


The mighty winged horse denoted by the asterism of the Square of Pegasus is making its way toward the western horizon and sets around 1:00am.  The zodiacal constellations of Pisces, Aries, Taurus, Gemini and Cancer are prominent mid month. Mighty Perseus stands guard directly overhead.

Taurus in the night sky Credit Stellarium

The most noteworthy and prominent constellation this month is Taurus the bull. Taurus is quite a striking constellation with its V shaped head and burning eye of the bull – The bright orange giant star Aldebaran. There are two of the best open clusters in the December night sky in Taurus. The Hyades which form the head of the bull and above all the Pleiades or Seven Sisters. You can find out more about the strikingly beautiful Pleiades here. The Pleiades are high in the sky and due south in December 2018.

Striking Constellations

The constellation of Orion the Hunter, is probably the most striking and recognisable constellation. Orion rises early in the evening and will be due south in January. Taurus stands in the way of Orion as he pursues the Pleiades through the night sky in Greek mythology. Forever chasing them but forever blocked by Taurus (Zeus) eternally in the night sky.

The second most recognisable constellation is Ursa Major. Also known as the Big Dipper or the Plough. Ursa Major is a northern constellation and is also a circumpolar constellation that never sets. It’s visible all year round.

In December 2018 it can be seen with its handle (Imagine a sauce pan) upended mid evening. Line up the two stars at the opposite of the handle known as the pointers. Then draw an imaginary line in the sky. Continue this imaginary line to a faint boring looking star. You have found the North Star – Polaris! In contrast to what many have been told, it’s not the brightest star in the sky. That title goes to Sirius which we will discuss next month.

Ursa Major and Minor. Use the pointers of the big dipper – Saucepan asterism to draw an imaginary line to the North Star – Polaris in Ursa Majors tail

A Comet

With its brightness expected to peak on December 16. Comet 46P/Wirtanen maybe just visible to the naked eye. The comet will build in brightness early December 2018. It will easily be spotted in binoculars or a telescope.

On December 16 Comet 46P/Wirtanen can be found near the Pleiades cluster in Taurus. Look for the comets bright nucleus and cloudy tail of dust and ice. Scan the area to find it or pinpoint it more using a star chart.

Pleiades and 46P/Wirtanen December 16 2018 Illustration by @VirtualAstro

Geminid Meteor Shower

Credit Meteorwatch @VirtualAstro

There are two meteor showers in December 2018. The Geminids and the Ursids. The Ursid Meteor Shower is a rather minor meteor shower and occurs on a Full Moon. Therefore, it won’t be a shower of note this year.

In contrast, the Geminid Meteor Shower is the most prolific and reliable meteor shower of the year. The grand finale of the annual meteor showers with up to 100 meteors per hour.

The Geminids peak on the evening of the 13/ 14 December 2018. They have a rather broad period of activity and many slow moving bright meteors can be seen a few days before their peak.

Click here for more information on this years Geminid Meteor Shower and how to watch it. 

International Space Station

ISS Pass Credit @Mark_Humpage

The International Space Station – ISS passes over the UK during the first half of December 2018.

The Space Station celebrates its 20th year in Space this year and has been a shining beacon of scientific endeavour, exploration and inspiration to many.

UK Space Station Spotters can find times here

For observers elsewhere, there are a number of apps and sites that will list pass times for your location.

A new website with worldwide times and alerts is coming soon.

Winter Solstice

This year Winter Solstice occurs at 22:23 GMT on 21 December 2018. Winter solstice or Midwinter is for those in the northern hemisphere the day with the longest period of darkness and shortest period of daylight of the year. In contrast, it is the opposite for the southern hemisphere.

Summer Solstice will be exactly 6 months away where the hours of night and day are reversed.

For a more detailed description see this Wikipedia page here.

Sunrise at Stonehenge © Stonehenge Stone Circle/Flickr Creative Commons CC BY 2.0

Tonights Sky by Hubblesite.org

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