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Gamma Cassiopeia

Celestial Objects to Observe

Meet Gamma Cassiopeiae, the Classic Eruptive Variable

Gamma Cassiopeia may lack a proper name, but the middle star of the "W"-shape constellation is worth finding on the sky.

Jupiter and Saturn in Capricornus, early Sept. 2021

Celestial News & Events

This Week's Sky at a Glance, Aug. 27 – Sept. 4

Venus, Jupiter, and Saturn are all getting a little higher in early evening. Vega passes the zenith soon after dark; Deneb does so two hours later. Andromeda is up in the east.

Moon under Saturn and Jupiter, Aug. 20-21, 2021

Celestial News & Events

This Week's Sky at a Glance, August 20 – 28

Jupiter and Saturn are just past opposition, so they dominate the sky all night. They inhabit dim Capricornus, which pushes Sagittarius westward. Venus, even showier, owns the western twilight but sets by full darkness.

Jupiter, Ganymede, Europa and double shadows, March 25, 2019

Celestial News & Events

The 12-Year Cycle of Jupiter Oppositions

Jupiter is at opposition on August 19th. If we take the long view — 12 years long — we can watch Jupiter's oppositions as it passes through the zodiac constellations.


It’s the Blue Moon . . . the “True” Blue Moon!

If skies are clear this weekend, you'll see the full Moon. And not just any old full Moon, but the Blue Moon . . . the "true" Blue Moon!

Jupiter and GRS

Celestial News & Events

Jupiter Dazzles at Its Brightest and Closest This Year

Jupiter comes to opposition on August 20th, when it will shine brighter and closer than at any other time this year. With nights starting earlier and cooler temperatures arriving, there's no better time to make the most of the planet.

The waxing gibbous Moon passing over Scorpius, Aug. 16-17, 2021

This Week's Sky At a Glance

This Week's Sky at a Glance, August 13 – 21

The Moon waxes from first quarter to gibbous in the evening sky, offering some of its most interesting telescopic aspects. Venus grows more insistent in the western twilight. And Jupiter and especially Saturn pose well in the southeast to south by late evening.

Celestial News & Events

Fine Show Expected from the Perseid Meteor Shower

With no interference from the Moon, this year's Perseid meteor shower should be excellent. If you couldn't catch the show last night, try looking up tonight!

Night Sky Sights

Learn to Star-hop in the August Sky

Learn to star-hop your way to celestial treasures in the August sky.

RS Oph animation

Celestial News & Events

Recurrent Nova RS Ophiuchi Just Blew its Top!

The recurrent nova RS Ophiuchi just went into outburst — its first burst in 15 years — and it's bright enough to see with the naked eye

Crescent Moon passing Venus, Aug 9-11, 2021

Celestial News & Events

This Week's Sky at a Glance, August 6 – 14

It's Perseid meteor week! Venus lights the western twilight. Saturn and Jupiter are up in the southeast by mid-twilight and await your telescope later at night. And explore the deep-sky glories of Sagittarius before moonlight returns.

Jupiter-Saturn-Moon in mid-August 2021

Sky Tour Astronomy Podcast

Welcome, Jupiter & Saturn!

The Perseids are upon us — and as you're looking out for shooting stars, look for Jupiter and Saturn low in the southeast as soon as night begins to fall.

Waning Moon crossing Gemini, Aug. 5-6, 2021

This Week's Sky At a Glance

This Week's Sky at a Glance, July 30 – August 7

Saturn is at opposition this week, and Jupiter is soon to follow. Will your scope show the Seeliger effect of Saturn's opposition rings? Venus continues to haunt the low west in twilight. And in the south, Sagittarius starts nudging Scorpius aside.

Doubles map east

Explore the Night with Bob King

Dazzling Double Stars for Compromised Skies

For many, smoke from wildfires has transformed summer nights, blotting out stars and familiar deep-sky sights. But through it all double stars keep on shining.

This Week's Sky At a Glance

This Week's Sky at a Glance, July 23 – 31

Saturn and Jupiter shine in the southeast by late evening. The bright Moon passes them on the 24th through 26th. Venus continues to sit patiently, changelessly, low in the west in twilight. Bootes and the Big Dipper mark the western sky after dark; the Summer Triangle emblazons the east.

Deep Sky

Night at the (Celestial) Museum

Take some time to explore the overlooked masterpiece of Messier 56.

Venus, Regulus, Mars low in twilight, July 21, 2021

This Week's Sky At a Glance

This Week's Sky at a Glance, July 16 – 24

Venus shines in the western twilight as Mars sinks away. Jupiter and Saturn rise in late dusk. And after dark, Scorpius shows off at its very best in the south.

NGC 5453 globular cluster

Celestial Objects to Observe

In Heaven with M7, a Portal Into the Deep

M7 in Scorpius is one of the brightest, most beautiful open clusters in the sky. It's also "home" to a half-dozen other delectable deep-sky sights.

The crescent Moon passes Venus and Mars in conjunction, July 11-12, 2021

Celestial News & Events

This Week's Sky at a Glance, July 9 – 17

Bright Venus and tiny Mars come to conjunction low in the western twilight, as the crescent Moon stands watch. On the other side of the sky, Saturn and Jupiter rise after dark. And before moonlight comes back, delve the deep sky in Scorpius and Sagittarius.

Moon between Pleiades and Aldebaran, dawn July 6, 2021

Celestial News & Events

This Week's Sky at a Glance, July 2 – 10

Bright Venus and faint little Mars close in on each other low in the western twilight. Scorpius, laden with interesting stars and deep-sky targets, is highest in the south right after dark. Sagittarius, even richer, follows behind. Saturn and Jupiter rise in late evening.