The Milky Way rises high in the south this month, with Sagittarius and Scorpius sitting in the east – a clue that winter is on its way. Sitting high in the southern sky during May is the prominent constellation Crux, the Southern Cross. If you have a small telescope, be sure to point it at Crux’s brightest star Acrux, which is actually a double star made of two blue-white stars.

The large constellation Centaurus, the Centaur, sits within the stunning star fields of the Milky Way. It is home to arguably the finest globular cluster in the whole night sky: the magnificent Omega Centauri, or NGC 5139. The constellation’s two brightest stars are Alpha and Beta Centauri, known more familiarly to astronomers as Rigil Kentaurus and Hader. The constellation is fully visible between the latitudes of 25°N and 90°S. For reference, the Mornington Peninsula Astronomical Society observatory at Mount Martha is located at 38°S.

This month’s conjunctions, which is when two astronomical objects appear close to each other, include the moon and Saturn on May 14, the moon and Mars on May 15, the moon and Venus on May 19, and the moon and Jupiter on May 20. A blue moon – the second full moon in a single calendar month – is expected on May 31. This relatively rare event occurs every two or three years and usually results in 13 full moons in a year rather than 12. This year the annual Eta Aquariid meteor shower peaks on the night of May 6-7 and is caused by the dust left over from Halley’s Comet entering our atmosphere and vaporising. You can expect to see roughly 30 meteors an hour if you are very lucky. The meteors appear to be coming from a point near the star Eta Aquarii in Aquarius, and tend to be quite fast-moving. The further south you are, the better view of the shower you will get.

By Nerida Langcake
This article appeared in the May 2026 issue of the Mornington Peninsula Magazine.