The sky of August 2019: guide to observation

Falling stars, visible planets, constellations… This and more on the August 2019 summer nights

stars man skyWhile waiting for the famous “Tears of San Lorenzo” to express our desires, there are many opportunities to admire the starry sky. Whether with the naked eye, or with telescopes or binoculars. From the junctions to the objects of the deep sky, we present the main astronomical phenomena of the August sky.


Moon – Spica

conjunction moon spica
Conjunction between Moon and Spica (Alfa Virginis)

The Moon will be in conjunction with Spica, the main star of the constellation of the Virgin (Alfa Virginis) in the evening between 5 and 6 August. Our satellite will be close to the First Quarter, in a growing phase so we can observe a crescent moon on the West horizon together with the blue-white Spica.

Moon – Saturn

The Moon, in the night between 11 and 12 August, will be almost full and in conjunction with Saturn. The planet of the rings is found for all month in the constellation of Sagittarius and will approach the star Nunki (Omicron Sagittarii) with retrograde motion on the same night of 11 August.

Jupiter – Antares

Beautiful conjunction between Jupiter, which still moves with retrograde motion in the constellation of Ofiuco, and the red Antares (Alfa Scorpii) on the evening of 12 August.

Venus – Sun

It is impossible to admire this conjunction: on August 14th the planet Venus will be in superior conjunction with the Sun so it will be undetectable from the surface of the Earth.

summer triangle sky
The Summer Triangle.
Credit: Wikipedia

Constellations in the sky of August

The Summer Triangle is still the king of summer skies allowing us to recognize other asterisms and constellations.

The constellation of the Swan, or Northern Cross, is very beautiful, the northern part of which will be at the zenith. We can find it in the portion of the sky called “Slit of the Swan”. Towards the south we can admire the constellation of Sagittarius, while the Scorpion with its Antares is near sunset.

On the eastern ecliptic we can admire Capricorn, Aquarius and Pisces. While the Eagle, the Lira and the Swan with its “tail” (Deneb) at the zenith accompany us on summer nights. To the east we see the square of Pegasus rise, together with Andromeda and Cassipoea. The bright star Arcturus in the constellation of the Boote is found instead to West. To the north, as always, the Ursa Minor indicates the north, surrounded by other circumpolar constellations (Ursa Major, Drago, Cepheus, Giraffe and Lince).

The Moon

It will be full on the 15th of the month. On August 1st there will be the phase of New Moon; the First Quarter is scheduled for August 7th. On the 15th there will be the Full Moon while on August 23rd the Last Quarter is scheduled. The New Moon will be on August 30th.

Visible planets


The 10th of the month reaches the maximum western elongation. Visible from the 5th of the month in the best conditions. We can find it at the beginning of the month in Gemini, before moving to Cancer, then to Leo.


Undetectable throughout the month. It will be in conjunction with the Sun on August 14th.


It will be undetectable throughout the month due to its angular proximity to the sun.


Visible to the north-east of Antares for the first part of the month, it is located in the constellation of Ofiuco.


Visible in the constellation of Sagittarius for most of the night. It will be in conjunction with Omicron Sagittarii on the 8th of the month.


It will be possible to see it, with the help of telescopes, for most of the night.


With the help of a telescope or binoculars it will be possible to observe it from sunset until the first light of dawn.

The Perseids

Daughters of the Comet 109P / Swift-Tuttle, the Perseids are probably the most awaited show by amateur astronomers and enthusiasts. The peak will be in the night between 12 and 13 August. Unfortunately in those days for this August 2019 the Moon will be almost completely full, so it will decrease the possibility of admiring the famous “shooting stars”. However the meteors can also be concentrated in other evenings such as that between 11 and 12 and 13 and 14. Essentially in the last hours of the night there is more possibility of observing light trails: from midnight to dawn, that is when the radiant is close to the zenith.

m39 open cluster
M39, open cluster in Cygnus.
Credit: Heidi Schweiker, WIYN, NOAO, AURA, NSF

Deep sky objects

The best time for observing objects in the deep sky, this August coincides with the last part of the month. The Moon will be in a waning phase and the night becomes longer, so it will be easier to distinguish clusters, nebulae and galaxies.

Among these M13, a globular cluster in the constellation of Hercules, visible also to the naked eye and M39, an open cluster in the Swan, also observable with binoculars. In Sagittarius, on the southern horizon we have instead a real “constellation” of interesting objects, including M8 or Nebula Laguna, that we can also see to the naked eye. M20 is another famous nebula, flanked by M21 which is instead an open cluster.

If the Moon will therefore not allow in part to capture in the August sky a conspicuous number of shooting stars, we can wait for the end of the month to observe objects of the deep sky. As well as the beautiful conjunctions visible from the beginning of the month. The still warm summer nights allow us, albeit with the right attire, to explore the wonders of our Universe.


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