National Centre of Competence in Research PlanetS
Sidlerstrasse 5 | CH-3012 Bern | Switzerland
  Tel. +41 (0)31 631 32 39
Fax. +41 (0)31 631 44 05

Glancing into the skies

Each month the night sky holds many beautiful and interesting objects that we can observe if the weather gods allow. The focus of this article is on the second half of August and on objects that can be seen by the unaided eye. Instead of hunting exoplanets, we will look out for the brighter planets in our own solar system, stars,  galaxies, and famous constellations.

Visible planets:

Especially beautiful will be Saturn’s meet-up with the Moon on the 22nd around 21:30 CEST: Deep down in the southwest, the waxing Moon and Saturn will be in very close conjunction. You can see Libra on the left, and Antares will shine in its bright reddish hue from the left in Scorpius.

Saturn and Moon on August 22nd around 9:30p.m. CEST

Saturn and Moon on August 22nd around 9:30pm CEST (T.R., Software: Stellarium)

 

Meteor showers:
No other month lets us spot more shooting stars racing across the nightly skies than August. The main reason is the Perseid meteor shower that just peaked last week around the 13th. As many as 100 shootings stars per hour could be observed and some of them were several seconds long and looked like fireballs. The quite spectacular phenomenon is produced by small particles with typical sizes between a needle tip and a fingernail.  They enter the Earth’s atmosphere at very high speeds, heat up, and start to glow before most of them eventually burn up. The air around them is glowing as well, that’s why we can see them so well despite their small size. The Perseids are a regular meteor shower that occurs whenever Earth enters the dust tail of comet Swift-Tuttle around August 12th each year. This comet crosses Earth’s orbit and leaves small particles behind in its path. It is still possible to see Perseids towards the end of August, but the frequency is much lower. Two more meteor showers will add shooting stars to the night sky near the end of the month: On the 27th, the Pi Eridanides and on the 30th the Gamma Doradides will have their maxima. At any given dark time, you should be able to spot at least one shooting star within 15 minutes. Have your wishes ready!

Stars and constellations:
The summer constellations are dominating the night sky and are high up towards zenith. As soon as the twilight starts, we can see Vega in the constellation of Lyra, Deneb in Cygnus, and Altair in Aquila. Together, these three bright stars are also called the summer triangle. In the west, a reddish star sparkles close to the horizon: Antares, the brightest star in Scorpius is about to set soon. Close to Beta Scorpii, the second brightest star in this constellation, you can see the sand-brown steady light of Saturn. Not far off due West is another red giant star: Arcturus in the constellation of Bootes. On its left side is a half circle of stars that catches the eye: The northern crown or Corona Borealis. In the East, the famous large square of Pegasus is rising. Attached to its left is the constellation of Andromeda. If you have good eyes and a dark location available, you might even spot the fuzzy light of our neighbour galaxy, M31 or the Andromeda galaxy.

Night sky on August 15th at 22:00 CEST (21:00 on August 30th). (T.R.; Software: Skychart)

Night sky on August 15th at 22:00 CEST (21:00 on August 30th). (T.R.; Software: Skychart)

CHEOPS made with a 3D printer
A life elsewhere for children
Categories: External Newsletter

Comments are closed.