Perseus, the hero, is low in the northeast at nightfall. Its brightest star, Alpha Persei, probably is just one percent of the age of the Sun, yet it already is nearing the end of its life because it’s much more massive than the Sun.
Weekly Stargazing Tips
Unless otherwise specified, viewing times are local time regardless of time zone, and are good for the entire Lower 48 states (and, generally, for Alaska and Hawaii). Check out last week's tips if you missed a night.
October 9: Alpha Persei
October 10: Morning Mercury
Venus, the “morning star,” is well up in the east at dawn, with slightly fainter Jupiter to its lower left. The much fainter planet Mercury stands well below them, just above the crescent Moon. Mercury will climb higher and shine brighter over the next few mornings.
October 11: Uranus at Opposition
The planet Uranus is putting in its best showing of the year. It rises at sunset, is in the sky all night, and is brightest for the year. In fact, under dark skies, those with keen vision might just make out the planet with the unaided eye.
October 12: 51 Pegasi
Pegasus, the flying horse, soars high across the sky on October evenings. In 1995, astronomers discovered a planet orbiting one of its stars, 51 Pegasi. It was the first planet discovered in orbit around a “normal” star like the Sun.
October 13: Hot Planet
Cancer, the crab, is high in the east at first light. One of its stars, 55 Cancri, hosts at least five planets, including one that may be covered by giant volcanoes that belch enough ash and gas to sometimes almost block its sun from view.
October 14: Tau Ceti
Tau Ceti, one of the most popular star systems in science-fiction, is in the constellation Cetus, the sea monster. The star climbs into view in the east-southeast by about 10 p.m. It is faint, so you need a starchart to help you pick it out.
October 15: Mars and Jupiter
Mars and Jupiter look like they are going to ram together in the dawn sky over the next few days. Jupiter is the brighter world, with orange Mars standing just below it tomorrow. They will move closer together on Saturday and Sunday.