November 2018

Sun and Moon
The New Moon is on the 7th of November 2018 at 18h02. The First Quarter falls on the 15th of November at 16h54 and the Full Moon occurs on the 23rd of November at 07h39. The Last Quarter falls on the 30th of November at 02h19.

The Moon will be at perigee (closest approach to the Earth) at a distance of 366 622 km on the 26th of November at 14h11. On the 14th of November at 17h58, the Moon will be at apogee (furthest from Earth) at a distance of 404 340 km.

Planetary and Other Events – Morning and Evening
Mercury, the smallest and innermost planet, can be located near the stars of the constellations Scorpius. Catch Mercury on the 9th of November as it will be near the red star of Scorpius called Antares. For the first three weeks of this month, Mercury can be seen during evening twilight. Venus dazzles the sky as the bright Morning Star and can be seen near the stars of the constellation Virgo. Venus progressively shines brighter over the month and will reach highest levels of brightness by the last of this month. Venus is known as Ikwezi in IsiXhosa and IsiZulu and Mphatlalatsana in SeSotho and Setswana when seen in the morning. Mars can be located near the stars of the constellation Capricornus at the beginning of this month, but from the 7th it is near the stars of Aquarius. Mars is only visible for the first half of the night. Jupiter can be located near the stars of the constellation Libra and can be observed just after sunset only for the first part of the month. Saturn can also be seen just after sunset and is near the stars of the constellation Sagittarius. Saturn sets during the course of the evening. Catch Saturn near the Moon on the 11th of November. Uranus can be located near the stars of the constellation Pisces and it sets early in the morning. Neptune can be seen near the stars of the constellation Aquarius, Neptune will be near the Moon on the 17th, and on the 30th of November Mars can be used to locate Neptune as they will be close to each other.

Several meteor showers are visible in November: the Orionids, the Southern and Northern Taurids, the Leonids and the alpha Monocerotids. The Orionids, which peaked in October, are active until the 7th of November. The Northern and Southern Taurids are active from the 1st of October until the 25th of November, with peak rates on the 12th (N) and 5th (S) of November respectively. The Leonids are active from the 12th – 21st of November, peaking on the 17th of November. The alpha Monocerotids are active from the 15th – 25th of November peaking on the 21st.

To observe the alpha Monocerotids, look north-east near the constellation of Monoceros for the alpha Monocerotids radiant (the area on the sky from which the meteors seem to originate from). The best time to view the alpha Monocerotids is from around 23:00 PM to dawn. They are very fast with some quite bright meteors. You should be able to see around 5-50 streaks an hour during the peak on the night of the 21st/22nd. To view the Taurids, look towards the constellation Taurus for the radiant. The best time to view the showers is from 21:30 PM to 03:30 AM on the nights of the 5th/6th (Southern) and 12th/13th (Northern) November. They are slow moving meteor showers and at their peaks, around 7 meteors per hour are predicted. To view the Leonids, look North-East towards the constellation Leo for the Leonids radiant. The best time to view the Leonids shower is from around 03:00 AM to 04:15 AM. Around 5-10 streaks per hour are expected at the peak of the shower on the night of the 17/18th of November.

The Evening Sky Stars
The stars of the Scorpion can still be glimpsed at the beginning of the month, low in the west after sunset, but only the tail is left by the end of November. Low in the northwest, the bright stars Vega and Deneb are likewise still visible on the 1st, but gone by the 30th. November is a good month to look for the Great Square of Pegasus, visible moderately low in the northern evening sky all month. Below and to the right of the lower right hand corner of the square is a double row of stars representing Andromeda (chained to a rock to appease a sea monster), and a dim fuzzy glow visible only on dark nights away from city lights. This is the Andromeda Galaxy, 2.5 million light years away and the most distant object easily visible to the unaided eye. Like our own Milky Way Galaxy, it’s a huge pinwheel of hundreds of thousands of millions of suns, more than a hundred thousand light years across. As galaxies go, it’s one of our near neighbours, and the largest in our local cluster. (Our Milky Way galaxy is the second largest.) The most distant galaxies we can see are more than 12 thousand million light years away.

The bright star Altair still shines brightly among the stars of the Eagle in the northwest, and the bright stars of the Crane and the Southern Fish are almost overhead in early evening. The foggy glow of the Large and Small Magellanic Clouds can easily be seen in the south (on dark nights away from city lights), with bright Achernar quite near the Small Cloud. Canopus (second brightest star in the sky) is rising in the southeast in early evening, while the Southern Cross and the Pointers are sinking lower in the southwest. The Milky Way is less well placed in November evenings than earlier in the year, low in the western and southern sky.
Rising in the east on November evenings are the stars of summer, with the bright stars of Taurus the Bull, Orion the Hunter and his dogs glowing brightly in the east. The brightest star in our sky is Sirius, the ‘eye’ of the Large Dog, and it often twinkles spectacularly near the horizon, sometimes appearing to flash red and green and producing UFO reports from members of the public who don’t watch the sky often.

The Morning Sky Stars
Regulus can be spotted at the end of Leo the Lion in the NE before dawn, while low in the north are the stars of the Twins, with brilliant Capella just above the horizon in the NNW. A bit higher in the north (above the twins) is Procyon, the brightest star in Orion’s smaller hunting dog. Orion himself is to the west of Procyon (left if you are facing north), holding up his club and lion skin while the Bull charges him from the west. Since Orion, like the other constellations invented in the northern hemisphere, is upside down in our skies, the Large Dog naturally runs above his feet. The stars of the Large Dog include Sirius, which appears brighter to the eye than any other star in our sky. Only 4 stellar systems are closer to the Sun than Sirius (8.6 light years), and it is by far the brightest of the stars in our neighbourhood, giving off more than 20 times as much light as our own Sun. The overwhelming majority of the stars nearest to our Sun are so dim that a telescope is needed to see them despite their closeness. Most of the stars we see in the sky with the naked eye are the rare extremely bright stars that can be seen at great distances.

High in the south are the bright stars of the great ship Argo. Brightest of these is Canopus, second brightest star in Earth’s sky and nearly overhead. Canopus is 15000 times as bright as our own sun, a rare supergiant which is the brightest star within 700 light years of us. If Canopus was at the same distance as Sirius it would rival the first quarter moon in brightness, and the southern hemisphere sky would seldom be fully dark! If this supergiant star was in the sun’s place at the centre of our solar system, its surface would lie three quarters of the way out to Mercury’s orbit, and a planet with an earth like temperature would have to be three times as far out as Pluto.

Achernar and the Small Magellanic Cloud are sinking into the southwest in the sky before sunrise, while the Cross and the Pointers (the two brightest stars in Centaurus) are rising in the southeast. 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 sky from the southeast to the northwest, passing almost overhead, but the northern portion is fairly dim and rather smooth looking, while the southern part is much brighter with obvious dark patches. When we look toward the Keel of Argo, we look directly along our own spiral arm in our galaxy, and the greater abundance of stars in that direction makes this a bright patch in the Milky Way. To the south and east of the Keel we look inward toward the richer star fields of the inner galaxy; to the north and west we look through the less impressive outer regions of the galaxy, where there are fewer stars.

Sivuyile Manxoyi (Sivuyile @saao.ac.za)
01 November 2018

What's Up

PDF version (two pages, including the full text)
Comments are closed.