On the evening of June 24, 1881, Sir William Huggins directed his reflector, equipped with spectroscopic and photographic tools and located in his private observatory in London, to the head of Comet 1881 III. He captured the first photographic spectrum of a comet, and later analysis of the imagery revealed cyanogen emissions at certain wavelengths.Continue reading "June 24, 1881: First photographic spectrum of a comet"

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Looking for a sky event this week? Check out our full Sky This Week column.  June 23: Try out the Turtle Nebula Now shining at magnitude 10.6, main-belt asteroid 21 Lutetia is sliding just south of a 9th-magnitude field star in Scorpius. The best time to observe is late in the evening in the hour or twoContinue reading "The Sky Today on Wednesday, June 24: Look for Lutetia’s light"

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Chris Schur, taken from Payson, Arizona In 1983, NASA’s pioneering Infrared Astronomical Satellite (IRAS) imaged the sky and found dust trails littered throughout the solar system. The cause turned out to be comets, which leave trails of dust that build up in their orbit. The dust trail of 10P/Tempel (also known as Comet Tempel 2)Continue reading "Comet Tempel 2’s dust trail"

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After 30 years of observing, I’ve compiled a list of some of my favorite deep-sky objects. These look best with a large telescope, so are great for more experienced observers. The Bug Nebula (NGC 6302) One of the strangest nebulae known makes a good target for large scopes. The Bug Nebula, also known as NGCContinue reading "Summer observing targets for large telescopes"

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NASA’s Mars Odyssey spacecraft completed its 60,000th orbit of the Red Planet on June 23, 2015. When Odyssey launched in April 2001 with a goal of better understanding Mars’ environment, the Red Planet was generally thought to be dry, barren world; the mission transformed our understanding, discovering widespread subsurface water ice. Its continuous observations haveContinue reading "June 23, 2015: 60,000 orbits for Mars Odyssey"

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Looking for a sky event this week? Check out our full Sky This Week column.  June 22: Visit the North America Nebula Mercury passes 7° due south of Pollux in Gemini at 3 P.M. EDT. By evening, Mercury, Jupiter, and Pollux create a skinny, tall triangle with the two planets forming the base and the star atContinue reading "The Sky Today on Tuesday, June 23: Try out the Turtle Nebula"

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Rocket launches this week Tonight, Monday, June 22, according to tracking from Next Spaceflight, The China Aerospace Science and Technology Corporation (CASC) plans to launch a Long March 7A rocket from the Wenchang Space Launch Site located in the South China Sea on the island of Hainan at 10:10 p.m. EDT. The payload has notContinue reading "SpaceX tests new vehicle, Swift gets a lift"

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On my way to Tash Rabat from Son-Kul, both in Kyrgyzstan, sitting on the comfortable seats of a minibus, I had to pinch myself just to realize that it wasn’t a dream. I could see green valleys on one side of the road and the rugged brown Pamir Plateau on the other. As someone whoContinue reading "Capturing the night sky in Kyrgyzstan"

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The Royal Observatory Greenwich celebrates its 351st anniversary today. Founded by King Charles II on June 22, 1675, the observatory was tasked with solving “the longitude problem,” the lack of accurate east-west positioning at sea because of the difficulty of precise timekeeping during long voyages. John Flamsteed, the first astronomer royal, led meticulous observations ofContinue reading "June 22, 1675: The Royal Observatory Greenwich is founded"

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Looking for a sky event this week? Check out our full Sky This Week column.  June 21: A summertime lineup If you’re up late after midnight, you’ll have the chance to check in on a summertime favorite: NGC 7000, the North America Nebula in Cygnus. Reaching nearly 70° high in the east by 2 A.M. local daylightContinue reading "The Sky Today on Monday, June 22: Visit the North America Nebula"

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Looking for a sky event this week? Check out our full Sky This Week column.  June 20: Libra’s Ghost Cluster The summer solstice occurs at 4:25 A.M. EDT. This is the time the Sun reaches its northernmost point in the Northern Hemisphere sky, which also means our star takes its longest path across this hemisphere’s sky onContinue reading "The Sky Today on Sunday, June 21: A summertime lineup"

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On June 20, 1943, Pingualuit Crater (formerly known as Chubb Crater and as the New Quebec Crater) was first photographed by a U.S. Army Air Force crew during a meterological flight over northern Quebec. Formed approximately 1.4 million years ago by a meteorite impact, the 2.1-mile-wide (3.4 kilometers) crater has an unusually circular shape resultingContinue reading "June 20, 1955: Pingualuit Crater is discovered"

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Looking for a sky event this week? Check out our full Sky This Week column.  June 19: Dione crosses due north of Saturn Highest in the south around 10:30 P.M. local daylight time is the constellation Libra, whose brightest star is Beta (β) Librae, also called Zubeneschamali. Nearly 12° below (south) of this star at that timeContinue reading "The Sky Today on Saturday, June 20: Libra’s Ghost Cluster"

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On June 19, 2004, at the Kitt Peak National Observatory in Tucson, Arizona, astronomers Roy Tucker, David Tholen, and Fabrizio Bernardi discovered Asteroid Apophis. This Near-Earth Object (NEO), approximately 1,099 to 1,230 feet (335 to 375 meters) wide, reached the highest ever rating of level 4 out of 10 on the Torino Impact Hazard Scale,Continue reading "June 19, 2004: Astroid Apophis is discovered"

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Looking for a sky event this week? Check out our full Sky This Week column.  June 18: The Moon and the Sickle Saturn rules the early-morning sky, shining at 1st magnitude in otherwise dim Pisces the Fish. One of the ringed planet’s many moons, Dione, passes due north of Saturn the morning of June 19. The 10th-magnitudeContinue reading "The Sky Today on Friday, June 19: Dione crosses due north of Saturn"

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Friday, June 19The Moon passes 0.3°  south of Regulus at 11 A.M. EDT. By evening, our satellite has moved farther east to lie to the bright star’s upper left as they slowly set in the west after sunset.  Bright Venus is now located in central Cancer and is just 45’ north of M44, the BeehiveContinue reading "The Sky This Week from June June 19 to 26: The summer solstice"

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We’re used to a lot of different natural things falling out of the sky. These can include snow, rain, and sometimes even frogs (yes, really). All of these relate to weather phenomena. Far more exotic things fall from the sky that are not related to weather. Earth is pelted by about 14 tons of micrometeoritesContinue reading "A meteorite impact may have once rained gold on Western Australia – new study"

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Sally Ride made history aboard the Space Shuttle Challenger on June 18, 1983, becoming the first American woman in space 20 years nearly to the day after Soviet Valentina Tereshkova’s flight. In 1977, as she was finishing her Ph.D. in physics, Ride saw a newspaper ad placed by NASA to recruit astronauts. For the firstContinue reading "June 18, 1983: Sally Ride is the first American woman in space"

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Looking for a sky event this week? Check out our full Sky This Week column.  June 17: The Moon covers Venus Now it’s Venus’ turn to close in on the Beehive Cluster (M44), which sparkles in central Cancer. Tonight after sunset, blazing Venus is just 1.3° from the center of this loose open cluster, which is visibleContinue reading "The Sky Today on Thursday, June 18: The Moon and the Sickle"

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John Vermette, taken from Starfront Observatory, Texas The famous galaxy group Markarian’s Chain in the heart of the Virgo cluster of galaxies dominates this wide-field vista as a line of eight galaxies stretching from upper left. But there are many more galaxies in this image: Every dot of light is a galaxy, as the photographerContinue reading "Virgo vertigo"

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