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RECORD-SETTING ASTEROID FLYBY: On Feb. 15th an asteroid about half the size of a football field will fly past Earth closer than many man-made satellites. Since regular sky surveys began in the 1990s, astronomers have never seen an object so big come so close to our planet. [full story] [video]
MAGNETIC FILAMENT: A bushy filament of magnetism is snaking over the sun's northeastern limb. NASA's Solar Dynamics Observatory took this extreme UV picture of the structure, which stretches more than 150,000 km from end to end, during the early hours of Jan. 30th:
If this filament becomes unstable, as bushy magnetic filaments often do, it could erupt and hurl a portion of itself into space. Amateur astronomers with backyard solar telescopes are advised to monitor developments.
If the filament does erupt, it will likely be the only solar activity today. No sunspots are actively flaring. NOAA forecasters estimate a slim 1% chance of M-class solar flares during the next 24 hours. Solar flare alerts: text, voice.
GREEN COMET LEMMON: 2013 could be the Year of the Comet. Comet Pan-STARRS is set to become a naked eye object in march, followed by possibly-Great Comet ISON in November. Now we must add to that list green Comet Lemmon (C/2012 F6). "Comet Lemmon is putting on a great show for us down in the southern hemisphere," reports John Drummond, who sends this picture from Gisborne, New Zealand:
"I took the picture on Jan. 23rd using a 41 cm (16 in) Meade reflector," says Drummond. "It is a stack of twenty 1 minute exposures." That much time was required for a good view of the comet's approximately 7th-magnitude coma ("coma"=cloud of gas surrounding the comet's nucleus).
Lemmon's green color comes from the gases that make up its coma. Jets spewing from the comet's nucleus contain cyanogen (CN: a poisonous gas found in many comets) and diatomic carbon (C2). Both substances glow green when illuminated by sunlight in the near-vacuum of space.
Discovered on March 23rd 2012 by the Mount Lemmon survey in Arizona, Comet Lemmon is on an elliptical orbit with a period of almost 11,000 years. This is its first visit to the inner solar system in a very long time. The comet is brightening as it approaches the sun; light curves suggest that it will reach 2nd or 3rd magnitude, similar to the stars in the Big Dipper, in late March when it approaches the sun at about the same distance as Venus (0.7 AU). Northern hemisphere observers will get their first good look at the comet in early April; until then it is a target exclusively for astronomers in the southern hemisphere.
Realtime Comet Photo Gallery
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Realtime Space Weather Photo Gallery
Realtime Noctilucent Cloud Photo Gallery
[previous years: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2011]