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Home Astronomy

December Evening Sky 2023  – Astronotes

December 17, 2023
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December Evening Sky 2023  – Astronotes
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And so we come to the month that accommodates the shortest day of the yr, the winter solstice. Extra thrilling, you would possibly assume, is the truth that this month accommodates Christmas!! 

There are numerous thrilling issues to see within the evening sky earlier than and even throughout that nice occasion although, so buckle up whereas we go on a tour of the evening sky in December. 

The primary occasion that takes place this Month within the celestial sphere is all concerning the planet Mercury. Normally, Mercury is a tough planet to identify, particularly within the Northern Hemisphere. It doesn’t enterprise removed from the solar within the sky in any respect (which you’ll be able to think about, given our relative positions within the Photo voltaic system). Mercury is both outshone by the solar, or barely rises above the horizon throughout sundown. So it’s a must to be dedicated and punctual to identify the smallest planet!

Picture Credit score: NASA

The large occasion that takes place on the 4th of December is Mercury being at its best japanese elongation. Now what that truly means is that it’s at its furthest level away from the solar in our skies, so it’s the best time to view the planet. Should you’re within the maths of it, it can attain 21 levels from the solar, with its most ever being 28 levels. 

Within the subsequent week of December look in the direction of the moon. The moon is a well-known sight to people because it goes by way of its phases over the course of the month (on common, 29.5 days to be exact). Its darkest section, the brand new moon, the place the moon lies between the solar and the earth (however not aligned in the correct method to be a uncommon photo voltaic eclipse) will happen this month on the 12th, and that is the very best time to take a look at the evening sky, unaffected by the brilliant mild of the moon. December can be a very good month to do some stargazing, as we now have a wide selection of constellations seen within the evening sky, so take this opportunity to move out. 

The Geminids Meteor Bathe. Picture Credit score: NASA

The cherry on the cake of this good timing is the meteor bathe that can peak on the 13th and 14th of December, made much more spectacular by the moon being new. This bathe is the Geminids, the very best meteor bathe of the yr. The meteors from this bathe (as you would possibly guess) radiate from the constellation of Gemini, and that is one among solely two main showers within the yr that originate from an asteroid, versus a comet.  

Normally, meteor showers are every related to a comet, which on its lengthy oval path across the solar, leaves an extended path of particles behind it. Yearly at roughly the identical time, the Earth then passes by way of this particles path on its orbit across the solar. This bathe, in contrast to many of the others, is related to not a comet, however an asteroid. The asteroid in query known as 3200 Phaethon, an uncommon asteroid whose orbit is a bit more comet-like than different asteroids. A lot so the truth is, that it’s generally referred to as a rock comet. The guardian physique of the Geminids meteor bathe was a thriller till 1983, when Phaethon was found, because it had been assumed that solely comets may generate meteor showers. 

Look out for the Geminids radiating from the constellation of Gemini within the East of the evening sky all evening, however particularly after midnight.  

We even have a extra minor meteor bathe, brought on by comet Tuttle, a number of days later – on the 21st and 22nd of December the Ursids meteor bathe will peak. It is a rather more sedate bathe although, with round 5-10 meteors per hour at its peak. And naturally the moon has carried on additional by way of its phases by this time, that means a few of the meteors could be drowned out by the sunshine of the waxing gibbous moon. 

Additionally on the 22nd December we in fact have the winter solstice, the shortest day of the yr and the primary official day of winter within the northern hemisphere. After all, if you’re within the southern hemisphere, it’s the first day of summer time, and the longest day of the yr. Anybody wishing they have been within the southern Hemisphere? 

Picture Credit score: Wikimedia

Nevertheless, if you wish to rejoice the solstice, we are able to look again to the previous. It has been marked for the reason that neolithic occasions, as an indication of when to plant crops, and the way finest to watch meals reserves. Authentic celebrations marked the life, dying and rebirth cycle, because the outdated yr died and the brand new yr was reborn. Estimation of time was extremely vital in the course of the ‘famine months’ the place meals was scarce. Cows have been usually slaughtered on the winter solstice to keep away from having to feed them by way of the winter, so why not make a celebration on one of many few occasions of yr that meat is plentiful! 

One of many constellations you could see within the evening sky this December is Orion, who’s spectacular to look out for within the winter sky, however you do have to attend for winter to see it at its finest! Orion is a very well-known constellation recognizable by his belt. The belt is made up of three stars, under which is Orion’s sword, which might level us in the direction of the superb Orion Nebula. Now you do want a telescope to see this in all its glory, however it’s positively price trying simply with the bare eye. You’ll see a diffuse blue cloud increasing out from a central level, which represents the clouds of fuel and dirt that new stars materialise from. The Orion Nebula is the closest giant star-forming area to Earth. 

Picture Credit score: Stellarium/Anna Taylor

Additionally within the constellation of Orion are two stars that exhibit the life cycle of huge stars superbly. These stars are Betelgeuse and Rigel and they’re at reverse ends of their life cycles. The star Rigel is a blue supergiant star, roughly 20 occasions the mass of our solar, and hundreds of occasions as luminous. Blue stars are normally scorching stars, within the early phases of their life cycle, and that is true of Rigel. It’s a star just a few million years outdated – that is nonetheless a star early in its life cycle. Betelgeuse then again is an older star, a pink supergiant. Attributable to the truth that giant stars dwell shorter, extra dramatic lives than stars the dimensions of our solar, Betelgeuse is youthful than our solar (10 million years outdated in comparison with our solar’s 5 billion years) however in a later stage in its life cycle. It’s reaching the purpose the place it might quickly go supernova (our solar is just too small to ever go supernova – it can take an alternate path). In truth, a number of years in the past Betelgeuse dimmed dramatically, and we thought it was about to blow up! Nevertheless it turned out that it was simply obscured by some mud – a really mundane cause for what we thought was going to be an thrilling phenomenon. 

Picture Credit score: freeimages.com

So take an opportunity this winter on clear nights to look out at our universe – you received’t remorse doing so. Ensure you put on thick socks, although! 



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