Star Charts

Check our website each month to download free star charts for night sky exploring. These simple star charts will help beginners recognise the major landmarks of the night sky and follow the motions of the bright planets. Click the month to download the pair of star charts – one looking east, the other west.web_general_800x400_star-charts

How to use the star charts

SKY SPOTTER – OCTOBER 2021

Dazzling Venus steals October’s western sky. Within a week it enters Scorpius, and on the 10th forms a triangle with orange Antares (the Scorpion’s heart) and the Moon. A week later, just 1.5° apart, Venus and Antares sit together in a lovely conjunction. To the left of the Scorpion’s tail, constellation Ara (the altar) is easily identified. Fainter Corona Australis (the southern crown) sits above the tail with the recognisable ‘teapot’ of Sagittarius on its right.

Around 9pm towards the north, Altair of Aquila (the eagle), sits midway up the sky. Easily identified, with two fainter stars above and below, Altair is the apex of the ‘summer triangle’. The stars forming the baseline, Vega of Lyra (the lyre) and Deneb of Cygnus (the swan), lie very low, just west of north.

Below Altair, a little right, is delicate Sagitta (the arrow). To Altair’s right is Delphinus (the dolphin), and a little further right and higher is Equuleus (the little horse). High above these little constellations magnificent Saturn and Jupiter dominate Capricornus (the sea goat). They are superb telescope targets for the October evenings.

Meanwhile, lower in the sky, the great square of Pegasus (the winged horse) drifts northwards from northeast. High above is bright Fomalhaut of Piscis Austrinus (the southern fish). From left to right, Fomalhaut, Al Nair of Grus (the crane), and Peacock of Pavo, form a long crooked line very high in the sky. By month’s end this line roughly parallels the south-eastern horizon.

Below central Alnair, bright Achernar marks the southern end of Eridanus (the river). To its right is the Small Magellanic Cloud with its larger sibling below. Canopus twinkles east of south while Crux (the southern cross), nearly inverted, approaches from the west. The southern pointers, Alpha and Beta Centauri, are above and to the right of Crux.

SKY GUIDE

SEPTEMBER 2021 I  OCTOBER 2021 I  NOVEMBER 2021

The spring night sky shows the clear transition from winter into summer, as the major winter constellations slip below the western horizon and Orion, the famous summer constellation rises in the east.

Our spring sky features the setting of the important winter constellations of Libra, Scorpius and Sagittarius. Scorpius will be seen plunging into the western horizon and as it does so Orion, the major constellation of the summer night sky, rises in the east. Following Sagittarius along the ecliptic line are the spring constellations of Capricornus, Aquarius, Pisces and Aries. None are as striking as the winter ones setting in the west.

The prominent planets in the evenings are Venus, Saturn, and Jupiter. Venus is impossible to miss, appearing in the west at twilight, and setting some three hours later. In September the gas giants appear high in the sky, east of northeast, at dusk. Both planets lie in the faint constellation Capricornus, substantially changing its look. As spring progresses, they drift westward and in November are lined up above Venus. Also putting in an appearance is nimble little Mercury, quite easily identified in September, low in the darkening western sky.

Looking due north, in early September you will see two bright stars. Vega is low down (and harder to spot in the south of the country) but Altair is higher up and easy to identify because it is flanked by two fainter stars. To the east of Aquila, with its bright star Altair, is the small but quite distinctive constellation of Delphinus (the Dolphin).

Around the end of November, as soon as the sky is dark, you will easily identify the constellation of Pegasus. Its notable feature is its large square shape, commonly called the ‘Great Square of Pegasus’. The constellation Andromeda runs off the lower right-hand corner of the Great Square and if you trace that line with binoculars, you may pick out the famous Andromeda Galaxy (M31). In truly dark sites with no Moon, most people can see this galaxy with their naked eye, even though it is some 2.5 million light-years away. Unfortunately, it never rises high in the New Zealand sky and it’s a challenge to see from Southland.

Looking now to the south, from early September soon after dark you should see Crux (the Southern Cross) on its side in the south-western sky. It is well marked by the two bright ‘Pointers’ above it. As the night goes on, as with the passing of days, Crux will be found lower and lower in our southern sky. Crux never actually sets in Aotearoa — it just skims the southern horizon when viewed from Cape Reinga but in Invercargill it is noticeably higher. Remember though that when Crux is near its lowest point in the sky, it may be hidden behind trees, buildings or hills, depending on your location.

The two bright stars of the southern sky to learn are Canopus and Achernar. To find Achernar it is easiest to imagine a line extending through the long axis of the Southern Cross. Because they are on opposite sides of the southern circumpolar sky, when one is low near the horizon, the other is at its highest point.

As the second brightest star in the sky after Sirius, Canopus is also easy to spot. The catch with Canopus is that for a brief period it dips below the southern horizon, at least in the North Island. Apart from that, during early evenings in spring, Canopus will be found low in the south-east. During these times when it’s close to the horizon, the motion of Earth’s atmosphere can cause Canopus to flash different colours and possibly even appear to jiggle about. While this is a common meteorological phenomenon called ‘scintillation’, it frequently causes Canopus to be reported as a UFO. Scintillation is commonly seen for any bright star close to the horizon, but it is more obvious on bright white stars like Canopus.

MERCURY

Mercury is well placed for viewing in the western sky after sunset over the first few weeks of September. Brighter than any surrounding stars it should be easily identified below and slightly to the left of Venus. From about 20 September it accompanies Spica in close conjunction as together they sink sharply towards the horizon over the following days. Mercury is lost to the Sun’s glare early in October. It returns to the dawn twilight from late October for a few weeks, very low in the east, but very hard to see.

VENUS

Brilliant Venus dominates the western sky throughout the entire season. In early spring the ecliptic line rises steeply away from the horizon in the southern hemisphere’s early evenings, and this combined with the planet’s position relative to Earth, keeps it high above the Sun from our perspective. For this reason, we get to enjoy its brilliance against a dark sky for up to three hours each evening. Venus forms a spectacular conjunction with the Moon on 08 November.

MARS

Mars is all but lost to the setting Sun’s glare in early September. It passes solar conjunction on 08 October and returns to the dawn twilight in late November. Very low, south of east, Mars is difficult to see.

JUPITER

Early in the season Jupiter, along with Saturn, which is dimmer, begin the evenings prominent in the eastern sky. Drifting westward they are high overhead in the early evenings in October. In November they’re firmly in the west and lining up above dazzling Venus. Following a close Moon/Venus conjunction on 08 November the Moon delights as it aligns with and passes by Saturn and Jupiter.

SATURN

Saturn is pale yellow in colour and much fainter than glowing Jupiter. However, it is easily identified, being much brighter than the surrounding stars of Capricornus. In early spring both planets are beautifully placed for telescope viewing but continue to be worth chasing right through until early summer.