After Sunset
In the early summer, the Big Dipper is easy to find, high in the northwest after sunset. Connect the dots to imagine a big spoon or ladle high above.
The Big Dipper is not officially a constellation; it’s what astronomers sometimes call an asterism. It’s a familiar name for this pattern of stars, especially used by observers in the United States, but it’s not one of the 88 constellations recognized by astronomers worldwide. Ursa Major the Great Bear is the official constellation here, but you’ll need dark skies to see its fainter stars.
Use the two stars at the end of the Dipper’s bowl to lead you to estrella polar, also known as the North Star. Polaris is not a particularly bright star, but it does remain fixed in the sky throughout the night and throughout the year. When you face the North Star, you’re facing due north. Polaris is at the end of the handle of the Little Dipper. This group of stars is also officially known as Ursa Minor the Little Bear.
Follow the curved handle of the Big Dipper to trace an ‘arc’ to Arcturus, the orange colored star in Boötes the Herdsman. Then speed on to Spica, the single bright star in Virgo the Maiden. Neither of these constellations has any other bright stars. Even under dark skies away from city lights, it’s hard to imagine these mythological figures just by connecting the dots.
Look to the east for the three bright stars that make up the Summer Triangle. Viewers with darker skies might find the fainter stars that make up the three constellations of the Triangle: Cygnus the Swan, Aquila the Eagle, and Lyra the Harp.
Look closely for the fairly unremarkable white colored star Albireo that marks the head of Cygnus. A small telescope reveals that there are really two stars there, appearing very close to each other. Not only that, but the two stars are different colors, one blue and one yellow! Recent analysis of the two stars’ motion suggests that unlike many double stars, these two stars are not in orbit around each other. They just happen to appear extremely close to each other from our vantage point on Earth.
Low in the south is the hook-shaped constellation Scorpius the Scorpion. The red star Antares marks the heart of the scorpion.
Just to the east of Scorpius is Sagittarius the Archer. To ancient civilizations it may have looked like a mythical centaur holding a bow and arrow, but to modern stargazers it looks a lot more like a teapot.
You can catch the red planet Mars low in the west just after sunset. It remains just barely visible in the evening twilight through early November, but it may be a challenge to spot.
Stay out late for Saturn. Early in the month the ringed planet rises just in the east before midnight. By the end of the month it will rise around 10pm and will continue to rise earlier over the next several months. Find the Moon near Saturn on July 15.
If you have a telescope, keep a close eye on Saturn's rings. About every fifteen years, Earth and Saturn line up for a series of ring plane crossings, when we will see Saturn's rings practically edge-on. During this time they seem to disappear from our perspective on Earth. The last time it happened was this past March, but nobody could see it — Saturn was already hidden in the daytime sky. The next time will be in November. Then it will be more than a decade when it will happen again.
From Dark Skies
La iluminación exterior brillante puede hacer que sea difícil ver todas las estrellas excepto las más brillantes. En una noche despejada, busque un lugar oscuro lejos de las luces de la ciudad, dé tiempo a sus ojos para adaptarse a la oscuridad y busque aún más vistas celestiales.
Evenings in the early summer are great for spotting the Milky Way coursing from Sagittarius and Scorpius, through the Summer Triangle and on towards Cassiopeia the Queen in the northeast. This hazy band of light is the bulk of our disc-shaped galaxy, as we see it from within.
As you look towards Scorpius and Sagittarius, you are looking in the direction of the dense center of the Milky Way Galaxy. Scan with binoculars or a telescope in this area to find many faint star clusters and nebulae throughout this part of the sky.
Look high overhead for the constellation Hercules. Four stars in Hercules form a trapezoid shape called the Keystone, after the top stone in an arch. This time of year the Keystone can appear directly overhead, from our part of the world. Imagine the Keystone holding up the arch of the sky!
Look near the Keystone for the globular cluster known as the Hercules Cluster, o M-13. Using binoculars, you may be able to spot a round-shaped glow. If that blurry glow doesn’t seem impressive, just remember that it’s a collection of around 300,000 stars, at a distance of over 22,000 light years, at an age of over 11 billion years old.
Some challenging constellations become much easier to spot under truly dark skies. Can you find Corona Borealis the Northern Crown o Ophiuchus the Serpent Bearer?
Early Morning
As the Earth orbits the Sun throughout the year, the constellations rise and set just a little bit earlier every day. You won’t see much difference from night to night, but you will over the course of weeks or months. What we see in today’s pre-dawn sky is a preview of the early evening sky in later months. Go out before dawn this month for a look ahead at the late autumn night sky.
In the hours before dawn, the Summer Triangle is high in the west. Sagittarius has already set. Autumn constellations such as Pegasus the Flying Horse y Andromeda the Princess are high overhead.
Brilliant Venus rises prominently in the east before dawn. Jupiter will join the morning sky late in July, passing close by Venus the mornings of August 11 and 12.
Look for a thin crescent Moon between Venus and Jupiter on the morning of July 22.
Before you set your alarm for the wee hours of the morning, consider planning out your observing. Desktop planetarium software like the free, open-source Stellarium can show you more precisely where night sky objects can be found on any date and time, and help you plan ahead.