January 2018

Sun and Moon

We have two Full Moons, this month.  The first Full Moon occurs on the 2nd of January at 04h24. Last Quarter falls on the 9th of January at 00h25 and the New Moon occurs 17th of January 04h17. The First Quarter falls on the 25th of January at 00h20. The second Full Moon (usually called a Blue Moon, a second Full Moon on the same calendar month) falls on the 31st of January at 15h24.

On the 1st of January at 23h48, the Moon will be at perigee (closest approach to Earth) at a distance of 356 565 km. The Moon will be at apogee (furthest from Earth) at a distance of 406 464 km on the 15 of January at 04h09. The moon will be also be at perigee on the 30th of January at 11h56 at a distance of 358 973 km.

Planetary and Other Events – Morning and Evening

Mercury will be visible before sunrise all month and can be seen near the constellation of Ophiuchus and later moving towards Sagittarius. Venus reaches superior conjunction on the 9th of January and will not be visible this month. Mars makes its grand entrance on the 1st of January and can be seen near the constellation of Libra. Jupiter parallels Mars as the month begins, catch the conjunction of Mars and Jupiter on the 6th and 7th of January. Saturn can be seen in the morning skies before sunrise from mid month. Catch the conjunction of Saturn and Mercury on the 12th and 13th of January before sunrise. Uranus near the constellation of Pisces and Neptune near the constellation of Aquarius can be seen as faint planetary disks with an aid of a telescope in the early morning sky.  .

Several meteor showers are active in January. The Puppid-Velids are active from December 5th 2016 to January 7th 2017, peaking on the 29th of December 2016. The alpha Crucids, in the constellation of the Southern Cross (Crux) are active from the 6th January – 28th January, peaking on the 19th. The alpha Centaurids, in the constellation of Centaurus are active from the 28th January to the 21st February, peaking on the 7th of February. They are best viewed between 00:00 AM and 03:30 AM looking towards the constellation of Crux.  Hourly rates are expected to be around 5 meteors per hour at the maximum.

The Evening Sky Stars

Low in the north in the evening are stars variously known as the Seven Sisters, the Pleiades, or Isilimela. There are six stars in this cluster which are fairly easily visible to the naked eye, and hundreds that can be seen through a telescope. Located about 420 light years away, this is a group of stars which formed from a cloud of interstellar dust and gas about 120 million years ago. The Pleaides stars easily visible to the naked eye are all more than a 100 times as bright as our Sun – our own Sun only looks brighter because it is 27 million times closer to us! Above and to the right of the Pleiades is another cluster of stars called the Hyades, making up the muzzle of Taurus the Bull. The Hyades are about 150 light years away, and about 600 million years old. Bright orange Aldebaran looks as though it ought to be part of this loose group, but is only located in the same direction and, at only 64 light years away, is less than half as distant. It is, however, the most luminous star within a hundred light years of us.

Low on the northern horizon glitters Capella, brightest star in Auriga the Charioteer. As with other bright stars, the effects of atmospheric refraction can cause it to twinkle vigorously when near the horizon, appearing to flash in multiple colours. In July 1951, a pilot in northern Michigan chased Capella for half an hour under the impression that it was a UFO. Given that Capella is 42 light years away, it is not surprising he did not catch it.

High in the NNE are the brilliant stars of Orion, with the twins (Castor and Pollux), lower in the NE. below Orion in the ENE (below Orion and to the right of the twins) is Procyon, brightest star in Orion’s smaller hunting dog. At only 11 light years away, Procyon is one of our nearest neighbours. Sirius is even nearer, high in the East in January evenings, at only 9 light years distant, and both have dim companions called “white dwarfs”, which are no larger than planets. The diameter of Procyon’s companion is only about 30% larger than the diameter of our Earth, while Procyon’s diameter is millions of kilometres. A white dwarf is a star that has used up its nuclear fuel, and is slowly cooling down until it crystallises, which typically takes billions of years. It still glows, but only with stored energy. Procyon’s companion, for example, is only 0.06% as bright as the Sun.

Canopus, the second brightest star in the Earth’s skies, is a bit SE of the zenith (the point overhead). South of the zenith is Achernar at the Southern end of the Celestial River, while Fomalhaut is the brightest star in the SW. In the southern half of the sky in January there is a curious blend of birds and water creatures (including the Southern Fish, the Crane, The Toucan, The Phoenix, The Peacock, the Bird of Paradise, the Flying Fish, the Swordfish and the Water Snake), mixed with mechanical and scientific constellations such as the Octant, the Pendulum Clock, the Chemical Furnace, the Microscope, the Engraving Tool and the Eyepiece Reticle. The Southern Cross and Pointers are very low in the SW even from the Cape and invisible from northern South Africa.

The Morning Sky Stars

Bright stars in the northern half of the sky include Regulus and Procyon in the northwest, orange Arcturus in the northeast. Blue-white Spica is much higher in the northeast. Spica is the brightest of the stars in Virgo, which represents a goddess of ancient mythology. Which goddess is a bit more mysterious, as some claim she was a goddess of the harvest, others a goddess of justice.

The Cross and the Pointers (the two brightest stars in Centaurus) are high in the south in the predawn January sky, with the three stars of the imaginatively named Southern Triangle directly below the Pointers. The Keel, the Sails, the Poop Deck (constellations seen to the right of the Southern Cross while facing south) were once part of the single giant constellation of Argo Navis, the Argonaut’s Ship that sailed to find the Golden Fleece. Just above the Southern Cross and the Housefly are the stars of the great ship Argo as it sails along the Milky Way, accompanied by the dim stars of the Flying Fish. The Milky Way stretches across the morning sky from east to west, a bit south of the zenith, with the bright stars of the Scorpion now rising in the east before dawn.  Look out for the brightest star in Scorpio, Antares (‘rival of Mars’).

Still very high in the January predawn sky is Hydra the Water Monster, with the Cup mounted on its back and the Crow flying nearby. The brightest star in Hydra is Alphard, high in the NW in the January predawn sky. At a distance of 175 light years away, Alphard is a giant star 40 times the diameter of our Sun, and would stretch halfway to the orbit of Mercury if placed where the Sun is. Since Alphard is also 400 times as bright as the sun, we would be crispy is a jiffy!


  Sivuyile Manxoyi (Sivuyile@saao.ac.za)

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