Highlights of the Month
January - a superb month to view Jupiter.
Jupiter imaged by Damian Peach
With Jupiter at opposition on January 5th, this is a great month to observe Jupiter. It now lies Gemini and so is high in the ecliptic and hence, when due south, at an elevation of ~60 degrees and is high in the sky for most of the night. Jupiter's angular size remains at about 46 arc seconds throughout the month so a small telescope can see lots of details - surely one should be on your shopping list if you do not have one! It is looking somewhat different than in the last few years as the north equatorial belt has become quite broad. The Great Red Spot has recently become more prominent and can be easily seen as a large feature in the South Equatorial Belt.
The features seen in the Jovian atmosphere have been changing quite significantly over the last few years - for a while the South Equatorial Belt vanished completely (as seen in Damian's image) but has now returned to its normal wide state. The diagram on right shows the main Jovian features as imaged by the author at the beginning of December 2012. The highlight below gives the times when the GRS is facing us.
The image by Damian Peach was taken with a 14 inch telescope in Barbados where the seeing can be particularly good. This image won the "Astronomy Photographer of the Year" competition in 2011.
See more of Damian Peach's images: Damian Peaches Website"
Features in Jupiter's atmosphere - December 2013.
January: Look for the Great Red Spot on Jupiter
Observe the Great Red Spot
This list gives some of the best evening times during January to observe the Great Red Spot which should then lie on the central meridian of the planet.
1st 18:21 20th 18:58
3rd 19:58 22nd 20:36
5th 21:36 25th 18:05
8th 19:06 27th 19:43
13th 18:13 29th 21:22
15th 19:51 31st 23:00
January 2nd - after sunset: Venus with a thin crescent Moon
Venus with a thin crescent Moon
About 45 minutes after sunset on the 2nd and given a low horizon in the southwest one should be able to observe Venus just below a very thin crescent Moon. It is rare that one could see two very thin crescents at the same time! Try to observe the earthshine on the Moon - the "dark side" illuminated by the light reflected by clouds on Earth.
Earthshine : Ian Morison
Around the 1st and 30th January - Find M31, The Andromeda Galaxy - and perhaps M33 in Triangulum - with no Moon in the sky.
How to find M31
In the evening, the galaxy M31 in Andromeda is visible in the south-west. The chart provides two ways of finding it:
1) Find the square of Pegasus. Start at the top left star of the square - Alpha Andromedae - and move two stars to the left and up a bit. Then turn 90 degrees to the right, move up to one reasonably bright star and continue a similar distance in the same direction. You should easily spot M31 with binoculars and, if there is a dark sky, you can even see it with your unaided eye. The photons that are falling on your retina left Andromeda well over two million years ago!
2) You can also find M31 by following the "arrow" made by the three rightmost bright stars of Cassiopeia down to the lower right as shown on the chart.
Around new Moon (1st and 30th January) you may also be able to spot M33, the third largest galaxy after M31 and our own galaxy in our Local Group of galaxies. It is a face on spiral and its surface brightness is pretty low so a dark, transparent sky will be needed to spot it using binoculars (8x40 or, preferably, 10x50). Follow the two stars back from M31 and continue in the same direction sweeping slowly as you go. It looks like a piece of tissue paper stuck on the sky just a bit brighter than the sky background. Good Hunting!
January 14th - evening: Jupiter and the full Moon
Jupiter with a full Moon
During the evening of the 14th, Jupiter will lie six degrees above and a little to the left of a 98.4% full Moon. The image was taken by the author when Jupiter came even closer to the Moon in 2012. However, to keep the image size reasonable, Jupiter has been "moved" a little closer to the Moon than it actually was. This image is a composite of many "web-cam" images to first cover the Moon and then give suitable exposures both for Jupiter and (requiring longer exposures) its moons. The techniques used to obtain this image are described in a book by the author: "An Amateurs Guide to Observing and Imaging the Heavens" which will be published by Cambridge University Press in April. It can be obtained at least cost from the "Book Depository".
January 25th - before dawn: Saturn close to a waning near third-quarter Moon
Saturn with a waning Moon
Before dawn on the 25th, a waning Moon will be seen just to the right of Saturn.
January 29th - before dawn: Venus with a thin crescent Moon
Venus with a thin crescent Moon
Looking southeast before dawn on the morning of the 28th, Venus should be seen just four degrees above a very slender waning crescent Moon.
January 11th: Two Great Lunar Craters
Tycho and Copernicus: Image Ian Morison.
Two great Lunar Craters: Tycho and Copernicus
This is a great night to observe two of the greatest craters on the Moon, Tycho and Copernicus, as the terminator is nearby. Tycho is towards the bottom of Moon in a densely cratered area called the Southern Lunar Highlands. It is a relatively young crater which is about 108 million years old. It is interesting in that it is thought to have been formed by the impact of one of the remnents of an asteroid that gave rise to the asteroid Baptistina. Another asteroid originating from the same breakup may well have caused the Chicxulub crater 65 million years ago. It has a diameter of 85 km and is nearly 5 km deep. At full Moon - seen in the image below - the rays of material that were ejected when it was formed can be see arcing across the surface. Copernicus is about 800 million years old and lies in the eastern Oceanus Procellarum beyond the end of the Apennine Mountains. It is 93 km wide and nearly 4 km deep and is a clasic "terraced" crater. Both can be seen with binoculars.
Full Moon showing Tycho's rays: IM
A Messier Object imaged with the Faulkes Telescope: Messier 1 - The Crab Nebula
The Crab Nebula, M1
Faulkes Telescope North.
The Crab Nebula, M16, imaged by Nik Szymanek.
This image was taken using the Faulkes Telescope North by Nik Szymanek - one of the UK's leading astro-photograpers. The Crab nebula - the first entry in Charles Messier's catalogue - is the remnant of a supernovae that was seen to explode in the year 1054. It is visible as the lower right of the pair of stars at the centre of the nebula and is a "neutron star" just 30km across but weighing more than our Sun! Under the intense pressure of gravity, the protons and electrons fused to form neutrons and the compact object became stable as gravity was opposed by "neutron degeneracy pressure" - a quantum mechanical force. It is now spinning just under 30 times a second and emitting two opposed beams of light and radio waves which pass across our location in space. We thus detect very regular pulses and so objects like this are called pulsars. At 8.4 magnitudes it is easily seen in a small telescopes under dark transparent skies appearing as a smudge of light which is a little underwhelming to see!
Learn more about the Faulkes Telescopes and how schools can use them: Faulkes Telescope"
Observe the International Space Station
The International Space Station and Jules Verne passing behind the Lovell Telescope on April 1st 2008.
Image by Andrew Greenwood
Use the link below to find when the space station will be visible in the next few days. In general, the space station can be seen either in the hour or so before dawn or the hour or so after sunset - this is because it is dark and yet the Sun is not too far below the horizon so that it can light up the space station. As the orbit only just gets up the the latitude of the UK it will usually be seen to the south, and is only visible for a minute or so at each sighting. Note that as it is in low-earth orbit the sighting details vary quite considerably across the UK. The NASA website linked to below gives details for several cities in the UK. (Across the world too for foreign visitors to this web page.)
Note: I observed the ISS three times recently and was amazed as to how bright it has become.
Find details of sighting possibilities from your location from: Location Index
See where the space station is now: Current Position
The Moon at 3rd Quarter. Image, by Ian Morison, taken with a 150mm Maksutov-Newtonian and Canon G7.
Just below the crator Plato seen near the top of the image is the mountain "Mons Piton". It casts a long shadow across the maria from which one can calculate its height - about 6800ft or 2250m.
|January 1st and 30th
Some Lunar Images by Ian Morison, Jodrell Bank Observatory: Lunar Images
A World Record Lunar Image
The 9 day old Moon.
To mark International Year of Astronomy, a team of British astronomers have made the largest lunar image in history and gained a place in the Guinness Book of Records! The whole image comprises 87.4 megapixels with a Moon diameter of 9550 pixels. This allows details as small as 1km across to be discerned! The superb quality of the image is shown by the detail below of Plato and the Alpine Valley. Craterlets are seen on the floor of Plato and the rille along the centre of the Alpine valley is clearly visible. The image quality is staggering! The team of Damian Peach, Pete lawrence, Dave Tyler, Bruce Kingsley, Nick Smith, Nick Howes, Trevor Little, David Mason, Mark and Lee Irvine with technical support from Ninian Boyle captured the video sequences from which 288 individual mozaic panes were produced. These were then stitched together to form the lunar image.
Plato and the Alpine Valley.
Please follow the link to the Lunar World Record website and it would be really great if you could donate to Sir Patrick Moore's chosen charity to either download a full resolution image or purchase a print.
A montage of the Solar System. JPL / Nasa
Jupiter is now well placed in the late evening sky in the middle of an excellent apparition.
A Cassini image of Jupiter . Nasa
Jupiter. This month Jupiter is visible all night long and dominates the south-eastern sky in the evening. At opposition on the 5th January, it will then be due south around midnight when it will be ~62 degrees above the horizon (in the UK) shining at magnitude -2.7 with a disk ~47 arc seconds across. Jupiter is lying in the constellation Geminimoving westwards in retrograde motion away from the star Wasat - Delta Geminorum. With a small telescope you can observe the 4 Gallilean moons as they weave there way around it and, at times, be also able to pick out the Great Red Spot visible as an indentation of the South Equatorial belt.
See the highlights above.
The planet Saturn. Cassini - Nasa
Saturn is now visible in the pre-dawn sky, rising at about 3 am on New Years day and at about 1:30 am at its end. Lying in Libra, it is shining with a magnitude of +0.6 and its disk has a diameter of ~16 arc seconds. The really good news is that the rings have now opened to around 22 degrees from the line of sight so presenting a magnificant view. Sadly for those of us in the northern hemisphere, Saturn is now lying in the more southerly part of the ecliptic so, even at opposition, its elevation does not get that high. Even worse, this will not improve for many years to come.
A Hubble Space Telescope image of Mars.
Jim Bell et al. AURA / STScI / Nasa
Mars, lying in Virgo, rises around midnight at the start of the month and about one hour earlier at month's end. Its magnitude increases from +0.9 to +0.3 during the month with its angular size increasing from 6.9 to 8.8 arc seconds. So, given good seeing, it is possible to see markings on its salmon-pink surface such as the polar caps and Syrtis Major. So, we can say that Mar's apparition is really on its way. Mars is moving down across Virgo. At the beginning of the month is just below to Porrima, Gamma Virginis whilst, at its end, it is just ~4.5 degrees to the upper left of Spica, Alpha Virginis.
Messenger image of Mercury Nasa
Mercury passed behind the Sun (superior conjunction) on December 29th and so will not be visible low in the west southwest until mid to late January. It reaches its greatest elongation (that is, furthest in angular separation) of 18 degrees on January 31st when it will lies about 10 degrees above the horizon 45 minutes after sunset lying near a slender crescent Moon. It magnitude will then be -0.6 and it will have an angular size of seven arc seconds.
Venus showing some cloud structure
Venus will pass between the Earth and the Sun on the 11th of January so will only be seen either at the very beginning of the month low in the south-western sky after sunset or, at month's end, low above the eastern horizon before dawn. On New Years Day, just 3% of its disk is illuminated but the slim crescent will span almost one arc minute across!
See the highlight above.
Radar image showing surface features
Find more planetary images and details about the Solar System: The Solar System
The Mid to Late Evening January Sky
The January Sky in the south - mid to late evening.
This map shows the constellations seen in the south around midnight. The brilliant constellation of Orion is seen in the south. Moving up and to the right - following the line of the three stars of Orion's belt - brings one to Taurus; the head of the bull being outlined by the V-shaped cluster called the Hyades with its eye delineated by the orange red star Aldebaran. Further up to the right lies the Pleaides Cluster. Towards the zenith from Taurus lies the constellation Auriga, whose brightest star Capella will be nearly overhead. To the upper left of Orion lie the heavenly twins, or Gemini , their heads indicated by the two bright stars Castor and Pollux. Down to the lower left of Orion lies the brightest star in the northern sky, Sirius, in the consteallation Canis Major. Finally, up and to the left of Sirius is Procyon in Canis Minor. There is also information about the constellation Ursa Major, seen in the north,in the constellation details below.
The constellation Taurus
Taurus is one of the most beautiful constellations and you can almost imagine the Bull charging down to the left towards Orion. His face is delineated by the "V" shaped cluster of stars called the Hyades, his eye is the red giant star Aldebaran and the tips of his horns are shown by the stars beta and zeta Tauri. Although alpha Tauri, Aldebaran, appears to lie amongst the stars of the Hyades cluster it is, in fact, less than half their distance lying 68 light years away from us. It is around 40 times the diameter of our Sun and 100 times as bright.
AAO Image of the Pleiades, M45, by David Malin
To the upper right of Taurus lies the open cluster, M45, the Pleiades. Often called the Seven Sisters, it is one of the brightest and closest open clusters. The Pleiades cluster lies at a distance of 400 light years and contains over 3000 stars. The cluster, which is about 13 light years across, is moving towards the star Betelgeuse in Orion. Surrounding the brightest stars are seen blue reflection nebulae caused by reflected light from many small carbon grains. These relfection nebulae look blue as the dust grains scatter blue light more efficiently than red. The grains form part of a molecular cloud through which the cluster is currently passing. (Or, to be more precise, did 400 years ago!)
VLT image of the Crab Nebula
Close to the tip of the left hand horn lies the Crab Nebula, also called M1 as it is the first entry of Charles Messier's catalogue of nebulous objects. Lying 6500 light years from the Sun, it is the remains of a giant star that was seen to explode as a supernova in the year 1056. It may just be glimpsed with binoculars on a very clear dark night and a telescope will show it as a misty blur of light.
Lord Rosse's drawing of M1
Its name "The Crab Nebula" was given to it by the Third Earl of Rosse who observed it with the 72 inch reflector at Birr Castle in County Offaly in central Ireland. As shown in the drawing above, it appeared to him rather lile a spider crab. The 72 inch was the world's largest telelescope for many years. At the heart of the Crab Nebula is a neutron star, the result of the collapse of the original star's core. Although only around 20 km in diameter it weighs more than our Sun and is spinning 30 times a second. Its rotating magnetic field generate beams of light and radio waves which sweep across the sky. As a result, a radio telescope will pick up very regular pulses of radiation and the object is thus also known a Pulsar. Its pulses are monitored each day at Jodrell Bank with a 13m radio telescope.
The constellation Orion
Orion, perhaps the most beautiful of constellations, will be seen in the south at around 11 - 12 pm during January. Orion is the hunter holding up a club and shield against the charge of Taurus, the Bull up and to his right. Alpha Orionis, or Betelgeuse, is a read supergiant star varying in size between three and four hundred times that of our Sun. The result is that its brightness varies somewhat. Beta Orionis, or Rigel, is a blue supergiant which, at around 1000 light years distance is about twice as far away as Betelgeuse. It has a 7th magnitude companion. The three stars of Orion's belt lie at a distance of around 1500 light years. Just below the lower left hand star lies a strip of nebulosity against which can be seen a pillar of dust in the shape of the chess-board knight. It is thus called the Horsehead Nebula. It shows up very well photographically but is exceedingly difficult to see visually - even with relativly large telescope.
The Horsehead Nebula: Anglo Australian Observatory
Beneath the central star of the belt lies Orion's sword containing one of the most beautiful sights in the heavens - The Orion Nebula. It is a region of star formation and the reddish colour seen in photographs comes from Hydrogen excited by ultraviolet emitted from the very hot young stars that make up the Trapesium which is at its heart. The nebula, cradling the trapesium stars, is a beautiful sight in binoculars or, better still, a telescope. To the eye it appears greenish, not red, as the eye is much more sensitive to the green light emitted by ionized oxygen than the reddish glow from the hydrogen atoms.
The Orion Nebula: David Malin
The constellation Ursa Major
The stars of the Plough, shown linked by the thicker lines in the chart above, form one of the most recognised star patterns in the sky. Also called the Big Dipper, after the soup ladles used by farmer's wives in America to serve soup to the farm workers at lunchtime, it forms part of the Great Bear constellation - not quite so easy to make out! The stars Merak and Dubhe form the pointers which will lead you to the Pole Star, and hence find North. The stars Alcor and Mizar form a naked eye double which repays observation in a small telescope as Mizar is then shown to be an easily resolved double star. A fainter reddish star forms a triangle with Alcor and Mizar.
Ursa Major contains many interesting "deep sky" objects. The brightest, listed in Messier's Catalogue, are shown on the chart, but there are many fainter galaxies in the region too. In the upper right of the constellation are a pair of interacting galaxies M81 and M82 shown in the image below. M82 is undergoing a major burst of star formation and hence called a "starburst galaxy". They can be seen together using a low power eyepiece on a small telescope.
M81 and M82
Another, and very beautiful, galaxy is M101 which looks rather like a pinwheel firework, hence its other name the Pinwheel Galaxy. It was discovered in1781 and was a late entry to Messier's calalogue of nebulous objects. It is a type Sc spiral galaxy seen face on which is at a distance of about 24 million light years. Type Sc galaxies have a relativly small nucleus and open spiral arms. With an overall diameter of 170,000 light it is one of the largest spirals known (the Milky Way has a diameter of ~ 130,000 light years).
M101 - The Ursa Major Pinwheel Galaxy
Though just outside the constellation boundary, M51 lies close to Alkaid, the leftmost star of the Plough. Also called the Whirlpool Galaxy it is being deformed by the passage of the smaller galaxy on the left. This is now gravitationally captured by M51 and the two will eventually merge. M51 lies at a distance of about 37 million light years and was the first galaxy in which spiral arms were seen. It was discovered by Charles Messier in 1773 and the spiral structure was observed by Lord Rosse in 1845 using the 72" reflector at Birr Castle in Ireland - for many years the largest telescope in the world.
M51 - The Whirlpool Galaxy
Lying close to Merak is the planetary nebula M97 which is usually called the Owl Nebula due to its resemblance to an owl's face with two large eyes. It was first called this by Lord Rosse who drew it in 1848 - as shown in the image below right. Planetary nebulae ar the remnants of stars similar in size to our Sun. When all possible nuclear fusion processes are complete, the central core collpses down into a "white dwarf" star and the the outer parts of the star are blown off to form the surrounding nebula.
M97 - The Owl Planetary Nebula Lord Rosse's 1848 drawing of the Owl Nebula