{"id":5926,"date":"2015-08-31T00:00:00","date_gmt":"2015-08-30T22:00:00","guid":{"rendered":"https:\/\/www.ieec.cat\/la-missi%c3%b3-gaia-celebra-el-seu-primer-any-dobservacions-cient%c3%adfiques-not-translated\/"},"modified":"2022-12-22T23:25:16","modified_gmt":"2022-12-22T22:25:16","slug":"la-missi%c3%b3-gaia-celebra-el-seu-primer-any-dobservacions-cient%c3%adfiques-not-translated","status":"publish","type":"post","link":"https:\/\/www.ieec.cat\/en\/la-missi%c3%b3-gaia-celebra-el-seu-primer-any-dobservacions-cient%c3%adfiques-not-translated\/","title":{"rendered":"La missi\u00f3 Gaia celebra el seu primer any d\u2019observacions cient\u00edfiques [NOT TRANSLATED]"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; fullwidth=&#8221;on&#8221; theme_builder_area=&#8221;post_content&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; height=&#8221;114px&#8221; background_color=&#8221;&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243; title_text=&#8221;&#8221; background_image=&#8221;\/wp-content\/uploads\/2022\/04\/slider-corpo2.jpg&#8221;][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; theme_builder_area=&#8221;post_content&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;||0px||false|false&#8221; custom_margin=&#8221;||0px||false|false&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243;][et_pb_row _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; type=&#8221;4_4&#8243; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221; _dynamic_attributes=&#8221;content&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243; custom_margin=&#8221;0px||0px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221;]@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF90aXRsZSIsInNldHRpbmdzIjp7ImJlZm9yZSI6IjxoMSBjbGFzcz1cImVudHJ5X3RpdGxlXCI+IiwiYWZ0ZXIiOiI8L2gxPiJ9fQ==@[\/et_pb_text][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221; _dynamic_attributes=&#8221;content&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; custom_margin=&#8221;0px||0px||false|false&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243;]@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF9kYXRlIiwic2V0dGluZ3MiOnsiYmVmb3JlIjoiIiwiYWZ0ZXIiOiIiLCJkYXRlX2Zvcm1hdCI6ImN1c3RvbSIsImN1c3RvbV9kYXRlX2Zvcm1hdCI6IlktbS1kIEg6aTpzIn19@[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;0px||||false|false&#8221; custom_padding=&#8221;0px||||false|false&#8221; top_divider_color=&#8221;RGBA(255,255,255,0)&#8221; top_divider_height=&#8221;0px&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_row column_structure=&#8221;4_4&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.ieec.cat\/wp-content\/uploads\/2022\/12\/1543421862_960e56e514e7f6e72c90d915e30606df_gaia_cat_eye_nebulae_20141208b_hi_jpg_1196206075.jpg&#8221; alt=&#8221;La missi\u00f3 Gaia celebra el seu primer any d\u2019observacions cient\u00edfiques [NOT TRANSLATED]&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; title_text=&#8221;PR_Image1.png&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243; width=&#8221;600px&#8221; module_alignment=&#8221;center&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]El passat 21 d&rsquo;agost, Gaia, el sat&egrave;l&middot;lit de l&rsquo;Ag&egrave;ncia Espacial Europea (ESA), va completar el seu primer any d&rsquo;observacions cient&iacute;fiques.<\/p>\n<p>Despr&eacute;s del seu llan&ccedil;ament el 19 de desembre de 2013 i un per&iacute;ode de sis mesos en &ograve;rbita, el sat&egrave;l&middot;lit va comen&ccedil;ar la seva rutina d&rsquo;operacions cient&iacute;fiques el 25 de juliol de 2014. Ubicat al punt L2 de Lagrange, a 1,5 milions de kil&ograve;metres de la Terra, Gaia observa estrelles i altres molts objectes astron&ograve;mics. Al cap d&#039;un per&iacute;ode de 28 dies que va servir per calibrar els instruments de mesura, el 21 d&#039;agost, Gaia va comen&ccedil;ar la seva labor d&#039;observaci&oacute; seguint uns par&agrave;metres dissenyats per aconseguir observar tot el cel. Des de llavors, el sat&egrave;l&middot;lit ha registrat 272 mil milions de mesures astrom&egrave;triques i de posici&oacute;, 54,4 mil milions de dades fotom&egrave;triques i 5,4 mil milions d&#039;espectres. L&#039;equip Gaia ha realitzat una gran tasca de processament i an&agrave;lisi de les dades amb l&#039;objectiu de desenvolupar un dels principals productes cient&iacute;fics de la missi&oacute; Gaia: un vast cat&agrave;leg de posicions, dist&agrave;ncies, moviments i altres propietats de m&eacute;s de mil milions d&#039;estrelles. Aquest gran volum de dades de naturalesa complexa requereix un enorme esfor&ccedil; per part de cient&iacute;fics i desenvolupadors de programari de tota Europa, que col&middot;laboren amb el Consorci per al Processament i l&rsquo;An&agrave;lisi de Dades de Gaia (DPAC). A aquest consorci pertany el grup d&#039;uns quaranta investigadors i enginyers de la Universitat de Barcelona (UB), el Grup Gaia Gal&iacute;cia i un equip de la Universitat Nacional d&#039;Educaci&oacute; a Dist&agrave;ncia (UNED).<br \/>\nCarme Jordi, investigadora de <a href=\"http:\/\/icc.ub.edu\/\">l&#039;Institut de Ci&egrave;ncies del Cosmos de la UB<\/a> (ICCUB-IEEC), afirma: &laquo;Aquest primer any ha estat clau per comprovar la qualitat cient&iacute;fica de les dades i l&#039;efic&agrave;cia dels algorismes de processament&raquo;. I afegeix: &laquo;En particular, el nostre grup, responsable de la recepci&oacute; de dades i el seu tractament inicial, ha superat les expectatives en la gesti&oacute; d&#039;aquest gran volum d&#039;informaci&oacute;&raquo;.<br \/>\nPer citar un exemple del proc&eacute;s de validaci&oacute; que s&#039;est&agrave; duent a terme, l&#039;equip Gaia ha aconseguit mesurar la paral&middot;laxi d&#039;una mostra inicial de dos milions d&#039;estels. La paral&middot;laxi &eacute;s la desviaci&oacute; de la posici&oacute; d&#039;un estel durant un per&iacute;ode d&#039;un any com a resultat del moviment de la Terra al voltant del Sol. No obstant aix&ograve;, aquest no &eacute;s l&#039;&uacute;nic moviment observat per Gaia: els estels tamb&eacute; es desplacen per l&#039;espai, la qual cosa es coneix com a moviment propi.<br \/>\nNormalment, un any d&#039;observacions no &eacute;s suficient per con&egrave;ixer la paral&middot;laxi i el moviment propi. Per superar aquest obstacle, els cient&iacute;fics han combinat les dades proporcionades per Gaia amb les posicions extretes del cat&agrave;leg Tycho-2, basat en dades obtingudes entre 1989 i 1993 pel predecessor de Gaia, el sat&egrave;l&middot;lit Hipparcos. Aix&ograve; limita la mostra a tan sol dos milions dels m&eacute;s de mil milions de dades proporcionades per Gaia fins al moment, per&ograve; ofereix algunes percepcions primerenques i &uacute;tils de la qualitat d&#039;aquestes dades.<br \/>\nDe moment, Gaia ha detectat centenars de punts transitoris. El primer va ser una supernova, detectada el passat 30 d&#039;agost de 2014. Aquests descobriments es comparteixen amb la comunitat Gaia tan aviat com s&oacute;n comunicats en forma de &laquo;Alerta Cient&iacute;fica&raquo;, la qual cosa permet un r&agrave;pid seguiment des de la Terra amb telescopis que permeten determinar la seva naturalesa.<br \/>\nUn punt transitori es va detectar en produir-se un sobtat i dram&agrave;tic esclat que va incrementar la seva lluminositat en un factor de cinc. Va resultar que Gaia havia descobert una variable catacl&iacute;smica, un sistema de dos estrelles en la qual una d&#039;elles, una nana blanca calenta, devora la massa del seu company estel&middot;lar el que produeix esclats de llum quan la mat&egrave;ria &eacute;s absorbida.<br \/>\nGaia ha descobert multitud d&#039;estels la lluminositat dels quals sofreix una s&egrave;rie de canvis regulars en el temps. El sat&egrave;l&middot;lit ha proporcionat corbes detallades de lluminositat per a dotzenes d&#039;estels variables de tipus RR Lyrae en el N&uacute;vol de Magallanes. Aquests detalls van permetre comprovar la gran qualitat de les dades.<br \/>\nUn altre dels curiosos objectes detectats per Gaia durant aquest primer any d&#039;observacions &eacute;s la nebulosa Ull de Gat, una nebulosa planet&agrave;ria tamb&eacute; coneguda com NGC 6543, situada prop del Polo Nord Ecl&iacute;ptic. Les nebuloses planet&agrave;ries es formen quan les capes exteriors d&#039;un estel de baixa massa s&#039;expulsen i interaccionen amb el mitj&agrave; interestel&middot;lar que les envolta, la qual cosa d&oacute;na lloc a una nana blanca compacta. Gaia ha realitzat m&eacute;s de 200 observacions de la nebulosa Ull de Gat i registrat m&eacute;s de 84.000 deteccions que perfilen de manera detallada l&#039;entramat de filaments gasosos pels quals aquests objectes s&oacute;n coneguts. At&egrave;s que les observacions continuen, Gaia podr&agrave; observar l&#039;expansi&oacute; dels nusos nebulars en aquesta i altres nebuloses planet&agrave;ries.<br \/>\nM&eacute;s a prop de nosaltres, Gaia ha detectat un gran nombre d&#039;asteroides, els petits cossos rocosos que poblen el nostre sistema solar, principalment entre les &ograve;rbites de Mart i J&uacute;piter. Els cient&iacute;fics de l&#039;equip Gaia han desenvolupat un programari especial per observar-los i relacionar-los amb les &ograve;rbites d&#039;altres asteroides ja coneguts amb l&#039;objectiu de distingir-los de la resta de dades amb els quals comptem per estudiar els estels. Per&ograve;, al seu torn, aquesta informaci&oacute; s&#039;utilitzar&agrave; per caracteritzar els asteroides ja coneguts i descobrir-ne milers de nous.<br \/>\nFinalment, a m&eacute;s dels mesuraments astron&ograve;mics i fotom&egrave;triques que Gaia realitza, el sat&egrave;l&middot;lit ha recollit els espectres de molts estels. Aquestes dades serviran principalment per determinar els moviments estel&middot;lars al llarg del camp de visi&oacute; en mesurar els canvis de posici&oacute; relatius de les l&iacute;nies d&#039;absorci&oacute; dels espectres com a conseq&uuml;&egrave;ncia de l&#039;efecte Doppler. No obstant aix&ograve;, en l&#039;espectre d&#039;alguns estels calents, Gaia tamb&eacute; ha observat l&iacute;nies d&#039;absorci&oacute; en el material interestel&middot;lar que permetran als cient&iacute;fics mesurar la seva distribuci&oacute;.<br \/>\n&laquo;Tots aquests exemples confirmen la revoluci&oacute; que la missi&oacute; Gaia representa per a l&#039;astrof&iacute;sica. Estem expectants davant la publicaci&oacute; de les primeres dades cient&iacute;fiques l&#039;estiu de 2016&raquo;, subratlla Eduard Masana, investigador de l&rsquo;ICCUB-IEEC.<br \/>\nParticipaci&oacute; de la UB a la missi&oacute; Gaia<br \/>\nEls integrants de l&rsquo;equip <a href=\"http:\/\/gaia.ub.edu\/\">Gaia-UB<\/a> s&oacute;n membres de l&rsquo;Institut de Ci&egrave;ncies del Cosmos de la UB (ICCUB) i de l&rsquo;Institut d&rsquo;Estudis Espacials de Catalunya (IEEC), aix&iacute; com del Departament d&#039;Astronomia i Meteorologia de la UB. Aquest equip, que participa en la missi&oacute; des dels inicis, ha contribu&iuml;t a definir alguns dels instruments i ha liderat el grup encarregat de les simulacions que han fet possible la posada a punt del programari per processar les dades. A m&eacute;s, &eacute;s l&#039;equip responsable del processament inicial de les dades. Els experts de la UB tamb&eacute; estan elaborant eines per a l&rsquo;explotaci&oacute; cient&iacute;fica de les dades obtingudes des de terra per complementar les de Gaia, i lideren la construcci&oacute; dels cat&agrave;legs de la missi&oacute;, tant els intermedis com el cat&agrave;leg final. El Centre de Processament de Dades de Barcelona &mdash;on s&rsquo;inclouen el CESCA i el Barcelona Supercomputing Center&mdash; proporciona recursos per executar part de les operacions durant tota la missi&oacute;, i ha estat un aliat imprescindible en la simulaci&oacute; de la gal&agrave;xia i les observacions per a totes les tasques preparat&ograve;ries i de verificaci&oacute; de la cadena de processament. M&eacute;s informaci&oacute; en aquest <a href=\"http:\/\/www.esa.int\/Our_Activities\/Space_Science\/Gaia\/Gaia_s_first_year_of_scientific_observations\">enlla&ccedil;<\/a> de la ESA [NOT TRANSLATED][\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; title_text=&#8221;PR_Image1.png&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243; width=&#8221;600px&#8221; module_alignment=&#8221;center&#8221;]El passat 21 d&rsquo;agost, Gaia, el sat&egrave;l&middot;lit de l&rsquo;Ag&egrave;ncia Espacial Europea (ESA), va completar el seu primer any d&rsquo;observacions cient&iacute;fiques. Despr&eacute;s del seu llan&ccedil;ament el 19 de desembre de 2013 i un per&iacute;ode de sis mesos en &ograve;rbita, el sat&egrave;l&middot;lit va comen&ccedil;ar la seva rutina d&rsquo;operacions cient&iacute;fiques el [&hellip;]<\/p>\n","protected":false},"author":0,"featured_media":5922,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"2880","footnotes":""},"categories":[71,76],"tags":[],"class_list":["post-5926","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-announcements","category-other-announcements"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>La missi\u00f3 Gaia celebra el seu primer any d\u2019observacions cient\u00edfiques [NOT TRANSLATED] - IEEC<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ieec.cat\/en\/la-missi%c3%b3-gaia-celebra-el-seu-primer-any-dobservacions-cient%c3%adfiques-not-translated\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La missi\u00f3 Gaia celebra el seu primer any d\u2019observacions cient\u00edfiques [NOT TRANSLATED] - IEEC\" \/>\n<meta property=\"og:description\" content=\"&quot; _builder_version=&quot;4.14.8&quot; _module_preset=&quot;default&quot; title_text=&quot;PR_Image1.png&quot; hover_enabled=&quot;0&quot; sticky_enabled=&quot;0&quot; width=&quot;600px&quot; module_alignment=&quot;center&quot;]El passat 21 d&rsquo;agost, Gaia, el sat&egrave;l&middot;lit de l&rsquo;Ag&egrave;ncia Espacial Europea (ESA), va completar el seu primer any d&rsquo;observacions cient&iacute;fiques. 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