Adrian Dening's
Stars Over Somerset

 

 

My weekly articles about what can be seen in the night sky over Somerset are broadcast every Thursday to Sunday at various times, on Yeovil's local community radio station Radio Ninesprings.
 
BBC Somerset also transmit the articles on Luke Knight's Friday evening show.
 
Please click on the link below to hear the interview that I gave BBC Somerset:
 
Adrian Dening & Luke Knight Interview MP3
 
 
Update January 2022..........I'm delighted to announce that Apple FM in Taunton are now also carrying the broadcasts :-)
 

 

Monday 31st January to Sunday 6th February 2022
 
Tuesday 1st is a New Moon, so you could go outside the following evening and try to spot what will be a thin 3%-lit crescent.  At the same time, planet Jupiter will be just above it.  Look towards the south west around 5.30pm and you will be able to catch them just before they set below the horizon.
 
 

The Moon and larger planets appear bright because they are reflecting light from our Sun and in astronomical terms, the distances involved are very small.  Stars are always fainter because they are generating their own light and it is having to travel a long way to reach us.  You can easily see Jupiter and the Moon, but as it won't be properly dark at that time, you won't see anything else!

 
As the Moon orbits around us, it has a slight rocking motion; or if you like, it wobbles a bit.  The technical term for this is "libration".  It means that sometimes you can see a little further around the sides of the Moon that are normally facing away from us.
 
 
Animation courtesy of Wikipedia
 
On Sunday 6th, there is an opportunity to observe what are known as the "libration Seas" on the eastern edge of the lunar surface - Mare Smythii and Mare Marginis.  Just after dark, the Moon will be located towards the south and it will still be appearing as a crescent shape as we had the New Moon only a few days before.  The easiest way to spot them is to first locate the Mare Crisium that is slightly further around the nearside.
 
 
 

While you are looking at the Moon that evening, the Pleiades open cluster of stars will be above it and slightly to the left, with the constellation of Orion further left.

 

 

Monday 24th to Sunday 30th January 2022
 

If you look due south around 10.30pm on Thursday 27th you can see the brightest star in the night sky, Sirius - the name being derived from the Greek word for "glowing".  It is the alpha star in the constellation of Canis Major.  Stars in a constellation are allocated letters of the Greek alphabet to identify them.  Particularly significant stars are also given names. 

 

Sirius is one of our closest neighbours outside the Solar System and is only 8.6 light years away from us.  The star is gradually moving closer to us and its brightness is expected to increase slightly over the next 60,000 years.

 

A little below Sirius is the open cluster of stars, identified by Charles Messier and given the designation M41.  The cluster contains around 100 stars including several red giants.  It has a magnitude of around +6.3 so cannot be seen with the naked eye, but a pair of binoculars will do fine.  M41 is 2300 light years away from us and is estimated to be around 190 million years old.  Further estimates give it a life expectancy of about 500 million years before it disintegrates, so there is plenty of time to observe it!

 
 
 

Alternatively, if you are up early around 6am on Friday 28th and look towards the south east, there will be a 21%-lit crescent Moon, with Venus to the left of it.  The Sun terminator, the border between light and dark on the Lunar surface, will be illuminating the crater Aristarchus which is the brightest feature on the nearside face of the Moon.

 
 

 

 

Monday 17th to Sunday 23rd January 2022
 
During the early evening, look high up towards the north east and find the constellations of Cassiopeia (the familiar "W" shape) and Perseus.  Between the two constellations is an object known as the Double Cluster.
 
 

This pair of open clusters was first catalogued as a "patch of light" back in 130BC.  They are relatively young, only about 12 million years old and are gradually moving towards us at a speed of approximately 30km/s.

 

With a magnitude of around +3.8, it will be best to use binoculars or a small telescope.  On Monday 17th there is a full Moon, so that will create some light pollution.

 

While you are looking in that direction, take a moment to identify the star Algol in Perseus.  Algol, also known as the "Demon Star", is actually a three-star system and as the stars pass in front of each other, they cause eclipses.  This means that the overall magnitude of +2.2 drops to +3.4 every few days when viewed from Earth.

 
Moving to the evening of Saturday 22nd, there will be an 83%-lit Gibbous Moon and an opportunity to make out the dark lava patches of the Mare Orientale.  It is situated right on the western edge of the Moon's nearside, so can be quite difficult to spot.  If you imagine the moon as a clock face, Mare Orientale is located at about 8.30, just below the crater Grimaldi.
 
 
The mare has been likened to a bull's-eye in appearance and below is an image of Mare Orientale that was taken by NASA's Lunar Orbiter 4 probe in 1967.
 

 

 

Monday 10th to Sunday 16th January 2022
 

We'll start next week with an opportunity to observe another of the lunar "clair-obscur" visual effects.  This time it's the turn of the "Jewelled Handle" which is caused by the lunar dawn illuminating the peaks of the Jura Mountains.  It occurs during the evening of Wednesday 12th and is best viewed with binoculars or a small telescope. 

 
Not to be confused with the Jura Mountains in the French Alps, the lunar Montes Jura (to give them their correct name) are located towards the north west nearside face of the Moon.  To make it easier to locate them, below is a diagram of the different "clair-obscur" effects, courtesy of Sky at Night Magazine.
 
 

If you fancy a bit of a challenge, on Thursday 13th you could have a go a spotting the minor planet 7 Iris which will be at magnitude +7.7.  You will need those binoculars or a telescope again because it is a bit too faint to be seen with the naked eye.

 

7 Iris will be located roughly halfway between the stars Pollux in the constellation of Gemini and Procyon in Canis Minor.  Around 7pm on 13th, these constellations will be towards the east, to the left of Orion.

 
 

7 Iris is one of the larger objects in the main asteroid belt located between Mars and Jupiter.  It is the 4th brightest object in the asteroid belt due to its shiny surface and was first discovered by astronomer J R Hind in 1847.   Hind discovered and named several asteroids, including one called 12 Victoria which caused quite a controversy as at the time, asteroids were not supposed to be named after living persons, but Queen Victoria was still on the throne!

 

 

Monday 3rd to Sunday 9th January 2022
 

The evening of Monday 3rd into the morning of Tuesday 4th sees the peak of the Quadrantids meteor shower, so named because the radiant point where the meteors appear to originate from is near the constellation of Quadrans Muralis. 

 

Hang on......there is no constellation called that!  Well there used to be!  The constellation was named by the French astronomer Jerome Lalande back in 1795.  Over the years, the number of stars was reduced so that it didn't clash and cause confusion with the constellations of Bootes and Draco.  Then in 1922 the International Astronomical Union deleted Quadrans from its list of 88 officially recognised constellations.

 

So let's start again........the radiant point is located to the left of the constellation Bootes, slightly down and  left from the tail of Ursa Major. 

At midnight, you will need to be looking towards the north east.

 
 

The Quadrantids is famous for producing a high number of bright meteors and this year it coincides with an almost New Moon, so there will be minimal light pollution.

 

I should mention a very exciting piece of space news that took place over the Christmas holidays - the successful launch of the James Webb Space Telescope that is intended to be the replacement for Hubble.  It left Earth on Christmas Day and is currently heading towards its destination a million miles away from us - no cloud up there!

 
https://www.jwst.nasa.gov/

 

 

Archived Articles
 
December 2021
 
November 2021
 
October 2021
 
September 2021
 
August 2021
 
July 2021

 

 

Screenshots courtesy of Stellarium

 

Copyright Adrian Dening and Radio Ninesprings 2022

 

To enquire about local astronomy talks and star parties
please contact Adrian Dening
 
07545 641068
info@starsoversomerset.com

 

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