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</o:shapelayout></xml><![endif]--></head><body lang=PT link=blue vlink=purple><div class=WordSection1><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span lang=EN-US style='font-size:11.5pt;font-family:"Arial","sans-serif";color:red;mso-fareast-language:PT'>BIG COMET PLUNGES TOWARD THE SUN: </span></b><span lang=EN-US style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'>Comet Lovejoy (C/2011 W3) is diving into the sun and furiously vaporizing as it approaches the stellar surface. The Solar and Heliospheric Observatory (SOHO) is recording the kamikaze plunge:<o:p></o:p></span></p><p class=MsoNormal align=center style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-align:center'><a href="http://spaceweather.com/images2011/14dec11/lovejoy_c3_anim.gif?PHPSESSID=ln8eqnurvgtpgpispdoalhg034"><span style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#0066CC;mso-fareast-language:PT;text-decoration:none'><img border=0 width=640 height=423 id="Imagem_x0020_1" src="cid:image001.jpg@01CCBB28.A070BA50" alt="Descrição: http://spaceweather.com/images2011/14dec11/c3_lovejoy_strip2.jpg"></span></a><span lang=EN-US style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'><br>SOHO Coronagraph: </span><span style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'><a href="http://spaceweather.com/images2011/14dec11/lovejoy_c3_anim.gif?PHPSESSID=ln8eqnurvgtpgpispdoalhg034"><span lang=EN-US style='color:#0066CC'>movie</span></a></span><span lang=EN-US style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'>, </span><span style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'><a href="http://sohowww.nascom.nasa.gov/data/realtime/c3/512/"><span lang=EN-US style='color:#0066CC'>latest image</span></a></span><span lang=EN-US style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'>"This is, without any doubt, the brightest sungrazing comet that SOHO has ever seen," says comet researcher Karl Battams of the Naval Research Lab in Washington DC.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'>The comet's nucleus, thought to be twice as wide as a football field, will skim approximately 140,000 km (1.2 solar radii) above the solar surface on Dec. 15/16. At such close range, solar heating will almost certainly destroy the comet's icy core, creating a cloud of vapor and comet dust that will reflect lots of sunlight.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'>"If Comet Lovejoy gets as bright as magnitude -4 or -5, there is a tiny but non-zero chance that it could become visible in the sky next to the sun," says Battams.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'>Indeed, something similar happened to Comet McNaught in January 2007 when it was visible in broad daylight: </span><span style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'><a href="http://spaceweather.com/comets/gallery_mcnaught_page7.php"><span lang=EN-US style='color:#0066CC'>gallery</span></a></span><span lang=EN-US style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'>. Standing in the shadow of a tall building to block the sun allowed the comet to be seen in blue sky nearby. <o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'>"Comet Lovejoy will be reaching perihelion (closest approach to the sun) right around sunset on Dec. 15th for people in the US East, Central, Mountain, and Pacific time zones," continues Battams. "Be alert for the comet to the left of the sun at that time." Caution: Do not look at or near the sun through unfiltered optics; focused sunlight can seriously damage your eyes.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'><a href="http://tech.groups.yahoo.com/group/comets-ml/message/18445"><span lang=EN-US style='color:#0066CC'>Discovered</span></a></span><span lang=EN-US style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'> on Dec. 2nd by amateur astronomer Terry Lovejoy of Australia, the comet is an unusually large member of the Kreutz family. Kreutz sungrazers are fragments of a single giant comet (probably the Great Comet of 1106) that broke apart back in the 12th century. SOHO sees one plunging into the sun every few days, but most are small, no more than 10 meters wide. Comet Lovejoy is at least ten times larger than usual. <o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'>Got pictures of Comet Lovejoy? </span><span style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'><a href="http://spaceweather.com/submissions?PHPSESSID=ln8eqnurvgtpgpispdoalhg034"><span lang=EN-US style='color:#0066CC'>Submit them here</span></a></span><span lang=EN-US style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'>.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span lang=EN-US style='font-size:11.5pt;font-family:"Arial","sans-serif";color:red;mso-fareast-language:PT'>UPDATE: COMET LOVEJOY HAS A COMPANION:</span></b><span lang=EN-US style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'> "Comet Lovejoy has a friend!" reports Karl Battams in </span><span style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'><a href="http://sungrazer.nrl.navy.mil/index.php?p=news/birthday_comet"><span lang=EN-US style='color:#0066CC'>his blog</span></a></span><span lang=EN-US style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'>. "Look for it in the upper-half of </span><span style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'><a href="http://sungrazer.nrl.navy.mil/index.php?p=images/lovejoy/lovejoy_companion.gif"><span lang=EN-US style='color:#0066CC'>this animation</span></a></span><span lang=EN-US style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#333333;mso-fareast-language:PT'> moving perfectly in step with Lovejoy. It's another Kreutz-group comet. This is not surprising. SOHO's Kreutz-group comets are very 'clumpy,' for want of a better word. We frequently see them arrive in pairs or sometimes trios, and the big bright ones in particular will often have a little companion comet."<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Fonte:</span><span lang=EN-US> Space Weather News for Dec. 15, 2011 </span><a href="http://spaceweather.com/" target="_blank"><span lang=EN-US>http://spaceweather.com</span></a><span lang=EN-US><o:p></o:p></span></p></div></body></html>