NEW AND IMPROVED: Turn your iPhone or iPod Touch into a field-tested global satellite tracker. The Satellite Flybys app now works in all countries. | | | MYSTERY OF THE MISSING DEBRIS: On June 3rd, amateur astronomers were startled by a bright flash of light on Jupiter. It appeared to be an impact event--a comet or asteroid hitting the planet's cloudtops. Curiously, though, the strike left no obvious debris. Was it really an impact--or something else? Today's story from Science@NASA discusses the possibilities. SOLAR FLARES: Today, June 12th at 0055 UT, new sunspot 1081 unleashed an impulsive M1-class solar flare. NASA's Solar Dynamics Observatory recorded the blast in high-resolution: movie formats: 2 MB mpeg; 0.9 MB iPad; 0.6 MB iPhone The explosion hurled a billion-ton coronal mass ejection (CME) off the sun's western limb; the cloud will probably not hit Earth. The explosion also produced a Type II radio burst. "Although the Sun was setting here in New Mexico, I was able to record the burst at 28 MHz and 24 MHz," says amateur radio astronomer Thomas Ashcraft. "Here is an audio file. The slow swoosh is radio noise from the sun!" The M2-flare was followed at 0917 UT by an even more picturesque C6-flare. SDO recorded that one, too: movie, still frame. More flares seem likely as restless sunspot 1081 continues to grow. Readers with solar telescopes are encouraged to monitor developments. WATCH OUT FOR THAT COMET: One wonders... Did the inhabitants of galaxy NGC 891 duck when Comet McNaught flew past the edge-on spiral on the morning of June 8th? Mike O'Connor and Tristan Dilapo took this picture of the cosmic close encounter from Colden, New York: Update: Time Lapse Video! "The comet was only 10 degrees above the horizon," says O'Connor. "Nevertheless, we got a good picture using a 12-inch telescope and an SBIG ST9-E camera." And, no, the denizens of that distant galaxy did not flinch, flee, duck or take notice in any way. NGC 891 is 30 million light years away, far removed from the willowy tail of Comet McNaught. We Earthlings are having the true close encounter. Comet McNaught (C/2009 R1) is gliding through the inner solar system, due to approach our planet only 100 million miles away on June 15th and 16th. The approaching comet looks great in small telescopes, and may yet become a naked-eye object before the end of the month. Because this is Comet McNaught's first visit, predictions of future brightness are necessarily uncertain; amateur astronomers should be alert for the unexpected. Get the full story and a finder chart from Sky & Telescope. See also: ephemeris, 3D orbit. more images: from Kerry-Ann Lecky Hepburn of Grimsby, Ontario; from Gregg Ruppel of Ellisville, MO; from Michael Jäger of Turmkogel, Austria; from Scott Tucker of Tucson, Arizona; from Jeff Greenwald of Laramie, Wyoming; from Feys Filip at the Public observatory "Sasteria" in Crete; from Gary of Fort Davis, TX; from Baqir of Quetta, Pakistan May 2010 Aurora Gallery [previous Mays: 2008, 2005, 2004, 2003, 2002] [aurora alerts] |