{"id":927,"date":"2013-09-18T10:43:05","date_gmt":"2013-09-18T10:43:05","guid":{"rendered":"http:\/\/gaia.ub.edu\/?page_id=927"},"modified":"2021-01-14T12:56:31","modified_gmt":"2021-01-14T11:56:31","slug":"phases-of-the-mission","status":"publish","type":"page","link":"https:\/\/gaia.ub.edu\/?page_id=927","title":{"rendered":"What is Gaia?"},"content":{"rendered":"<ul>\n<li>\n<h3><a href=\"#whatis\">General view<\/a><\/h3>\n<\/li>\n<li>\n<h3><a href=\"#phases\">Phases of the mission<\/a><\/h3>\n<\/li>\n<\/ul>\n<hr \/>\n<p><a name=\"whatis\"><\/a><\/p>\n<h1 style=\"text-align: justify;\"><span style=\"color: #0078bd;\">General view<br \/>\n<\/span><\/h1>\n<p id=\"docs-internal-guid--cc061eb-359b-1fca-2b8b-5fca788df2b6\" dir=\"ltr\" style=\"text-align: justify;\"><span style=\"color: #0078bd;\"><a href=\"http:\/\/www.rssd.esa.int\/index.php?project=GAIA&amp;page=index\" target=\"new\" rel=\"noopener noreferrer\"><span style=\"color: #0078bd;\">Gaia<\/span><\/a><\/span> is a satellite by the European Space Agency (<span style=\"color: #0078bd;\"><a href=\"http:\/\/www.esa.int\" target=\"new\" rel=\"noopener noreferrer\"><span style=\"color: #0078bd;\">ESA<\/span><\/a><\/span>),which main goal is to make the largest, most precise three-dimensional map of our Galaxy by surveying a billion stars (about one per cent of its population) with an unprecedented precision in position (of the order of microarcsecond, equivalent to distinguish a coin located on the surface of the Moon from Earth) and motion. The astrophysical parameters of the stars (temperature, size, composition, \u2026) will also be obtained thanks to photometric measurements. With all these data, Gaia will be able to clarify the structure, formation and evolution of our Galaxy.<\/p>\n<p><center><iframe loading=\"lazy\" src=\"\/\/www.youtube.com\/embed\/mopawvZhri4\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/center><\/p>\n<h1 style=\"text-align: justify;\"><\/h1>\n<p style=\"text-align: justify;\"><a name=\"phases\"><\/a><\/p>\n<h1 style=\"text-align: justify;\"><span style=\"color: #0078bd;\">Phases of the mission<\/span><\/h1>\n<h2 style=\"text-align: justify;\"><strong><span style=\"color: #0078bd;\">Design phase<\/span><\/strong><\/h2>\n<p style=\"text-align: justify;\">Due to the successful (Hipparcos mission, 1993), the idea of the Gaia mission was beginning to take shape (1993) in order to get the maximum return from the concept just tested with Hipparcos. In 1999, the Concept &amp; Technology Study was presented and the mission <strong><span style=\"color: #0078bd;\"> was accepted in 2000<\/span><\/strong> by the ESA Science Programme Committee.<\/p>\n<p style=\"text-align: justify;\">Gaia was originally foreseen to be launched by Ariane 5, but a further industrial study was carried out in early 2002 to assess accommodation within the smaller (and cheaper) Soyuz launcher.<\/p>\n<p style=\"text-align: justify;\">From 2002 and 2005, industrial technology studies (Phase B1) were done in collaboration with scientists in order to ensure the feasibility of reaching the scientific goals with existing technology.<br \/>\n<a name=\"building\"><\/a><\/p>\n<h2 style=\"text-align: justify;\"><strong><span style=\"color: #0078bd;\">Building the satellite<\/span><\/strong><\/h2>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #0078bd;\">In 2006<\/span><\/strong>, the primary contract to build the satellite was assigned to EADS Astrium SAS. Some parts of the satellite were constructed by other companies all around Europe. Also in 2006, DPAC consortium was created to be prepared for data handling during the operational phase of the mission.<\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #0078bd;\">In 2009<\/span><\/strong>, the Gaia torus is completed and the deployable sun-shield assembly and the unit responsible for the real-time processing and commanding of star data transmitted (VPU) were tested.<\/p>\n<div style=\"width: 482px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.rssd.esa.int\/SA\/GAIA\/images\/image_gallery\/20111216_orig.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\" \" src=\"http:\/\/www.rssd.esa.int\/SA\/GAIA\/images\/image_gallery\/20111216_orig.jpg\" alt=\"\" width=\"472\" height=\"315\" \/><\/a><p class=\"wp-caption-text\">Gaia sun-shield during deployment test<\/p><\/div>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #0078bd;\">In 2010<\/span><\/strong>, all Gaia CCD were delivered, the first mirrors were completed and the Soyuz launch facilities at the European space port in Kourou, French Guiana, were near completion.<\/p>\n<div style=\"width: 483px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.rssd.esa.int\/SA\/GAIA\/images\/image_gallery\/20110810b_orig.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\" \" src=\"http:\/\/www.rssd.esa.int\/SA\/GAIA\/images\/image_gallery\/20110810b_orig.jpg\" alt=\"\" width=\"473\" height=\"315\" \/><\/a><p class=\"wp-caption-text\">Integration of the M1 primary mirror on the torus<\/p><\/div>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #0078bd;\">In 2011<\/span><\/strong>, the sun-shield deployment tests were successfully completed. 10 mirrors were already built. All CCDs mounted in the focal plane structure. The payload vibration tests were successfully passed. The first Soyuz launch from Kourou with the same configuration to be used by Gaia was successfully done.<\/p>\n<div style=\"width: 484px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.rssd.esa.int\/SA\/GAIA\/images\/image_gallery\/20110706a_orig.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\" \" src=\"http:\/\/www.rssd.esa.int\/SA\/GAIA\/images\/image_gallery\/20110706a_orig.jpg\" alt=\"\" width=\"474\" height=\"315\" \/><\/a><p class=\"wp-caption-text\">Assembly of the Gaia CCD array<\/p><\/div>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #0078bd;\">In 2012<\/span><\/strong>, a new tracking station from ground was assigned to Gaia (Malarg\u00fce in Argentina) to be added to the other two already available (New Norcia in Australia and Cebreros in Spain). Launcher separation, payload module vibration tests and service module thermal testing were completed. Basic Angle Monitor and Gaia Phased Array Antenna were delivered and integrated into the Service Module.<\/p>\n<div style=\"width: 484px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.rssd.esa.int\/SA\/GAIA\/images\/image_gallery\/cebrerosAntenna.JPG\"><img loading=\"lazy\" decoding=\"async\" class=\" \" src=\"http:\/\/www.rssd.esa.int\/SA\/GAIA\/images\/image_gallery\/cebrerosAntenna.JPG\" alt=\"\" width=\"474\" height=\"315\" \/><\/a><p class=\"wp-caption-text\">Deep space radio antenna in Cebreros (Spain)<\/p><\/div>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #0078bd;\">In 2013<\/span><\/strong>, the Flight Model Payload Module thermal testing and Data Handling Unit were completed. On August 23rd, Gaia arrived to Kourou (French Guiana) where It will finally be launched. Everything is ready for the launch of Gaia.<\/p>\n<div style=\"width: 233px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/blogs.esa.int\/gaia\/files\/2013\/09\/7736741.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\" \" src=\"http:\/\/blogs.esa.int\/gaia\/files\/2013\/09\/7736741.jpg\" alt=\"\" width=\"223\" height=\"315\" \/><\/a><p class=\"wp-caption-text\">Gaia is packaged to be sent to Kourou<\/p><\/div>\n<p style=\"text-align: justify;\"><a name=\"launch\"><\/a><\/p>\n<h2 style=\"text-align: justify;\"><strong><span style=\"color: #0078bd;\">Launch into space<\/span><\/strong><\/h2>\n<p style=\"text-align: justify;\">Gaia was launched from Europe&#8217;s Spaceport in French Guiana by a Soyuz-Fregat launch vehicle on<strong> 19 December 2013<\/strong> (09:12:19 UTC). After a 30 days voyage, Gaia reached an orbit around the <span style=\"color: #0078bd;\"><a title=\"What is L2?\" href=\"http:\/\/blogs.esa.int\/gaia\/2013\/09\/06\/gaia-goes-to-l2-whats-an-ell-two\/?utm_source=rss&amp;utm_medium=rss&amp;utm_campaign=gaia-goes-to-l2-whats-an-ell-two\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"color: #0078bd;\">L2 point<\/span><\/a><\/span> of Sun-Earth system (at 1.5 million km distance from Earth in the opposite direction of the Sun) where It is obtaining its data for a period of 5-6 years.<\/p>\n<p><center><iframe loading=\"lazy\" src=\"\/\/www.youtube.com\/embed\/rrCxVTh3HCM\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/center><\/p>\n<p style=\"text-align: justify;\"><a name=\"releases\"><\/a><\/p>\n<h2 style=\"text-align: justify;\"><strong><span style=\"color: #0078bd;\">Data releases<\/span><\/strong><\/h2>\n<p style=\"text-align: justify;\">Gaia data is released as soon as all the processing and verification is done. CU9 is the DPAC Unit responsible to deliver Gaia data.<\/p>\n<div id=\"attachment_1431\" style=\"width: 325px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/gaia.ub.edu\/wp-content\/uploads\/2013\/09\/CU9_logo1.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1431\" class=\" wp-image-1431 \" src=\"http:\/\/gaia.ub.edu\/wp-content\/uploads\/2013\/09\/CU9_logo1.jpg\" alt=\"CU9_logo\" width=\"315\" height=\"315\" srcset=\"https:\/\/gaia.ub.edu\/wp-content\/uploads\/2013\/09\/CU9_logo1.jpg 1240w, https:\/\/gaia.ub.edu\/wp-content\/uploads\/2013\/09\/CU9_logo1-300x300.jpg 300w, https:\/\/gaia.ub.edu\/wp-content\/uploads\/2013\/09\/CU9_logo1-150x150.jpg 150w, https:\/\/gaia.ub.edu\/wp-content\/uploads\/2013\/09\/CU9_logo1-160x160.jpg 160w, https:\/\/gaia.ub.edu\/wp-content\/uploads\/2013\/09\/CU9_logo1-184x184.jpg 184w\" sizes=\"auto, (max-width: 315px) 100vw, 315px\" \/><\/a><p id=\"caption-attachment-1431\" class=\"wp-caption-text\">Gaia CU9 logo<\/p><\/div>\n<p style=\"text-align: justify;\">Due to the complexity of the data processing, the delivery of the data was foreseen in different stages (see ESA webpage for more information):<\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #0078bd;\">First release (Launch + 22 months):<\/span><\/strong> Positions and magnitudes of the 90 percent of the sky with acceptable precisions. In particular the stars observed in common with Hipparcos mission will also be delivered in order to allow the comparison with the data of 1989-1993. <strong>First release: 14 September 2016<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #0078bd;\">Second release (Launch + 28 months):<\/span><\/strong> Integrated BP\/RP photometry, mean radial velocities for those objects with constant radial velocity and astrophysical parameters derived with good accuracy are delivered. <strong>Second release: Q4 2017<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #0078bd;\">Third release (Launch + 40 months):<\/span><\/strong> Orbital solutions of binary systems. BP\/RP\/RVS spectra delivered for those objects with good astrophysical parameters determined.<\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #0078bd;\">Fourth release (Launch + 65 months):<\/span><\/strong> Variable stars classification with epoch photometry, orbital solutions for Solar System objects and non-single objects catalogue.<\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #0078bd;\">Final release (End of mission + 3 years):<\/span><\/strong> The catalogue will be consisting of:<\/p>\n<ul style=\"text-align: justify;\">\n<li>Full astrometric, photometric, and radial-velocity catalogues.<\/li>\n<li>All available variable-star and non-single-star solutions.<\/li>\n<li>Source classifications (probabilities) plus multiple astrophysical parameters (derived from BP\/RP, RVS, and astrometry) for stars, unresolved binaries, galaxies, and quasars. Some parameters may not be available for faint(er) stars.<\/li>\n<li>A list of exoplanets.<\/li>\n<li>All epoch and transit data for all sources.<\/li>\n<li>All ground-based observations made for data-processing purposes.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>General view Phases of the mission General view Gaia is a satellite by the European Space Agency (ESA),which main goal is to make the largest, most precise three-dimensional map of our Galaxy by surveying a billion stars (about one per cent of its population) with an unprecedented precision in position (of the order of microarcsecond, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":332,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-full.php","meta":{"footnotes":""},"class_list":["post-927","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/gaia.ub.edu\/index.php?rest_route=\/wp\/v2\/pages\/927","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gaia.ub.edu\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/gaia.ub.edu\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/gaia.ub.edu\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gaia.ub.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=927"}],"version-history":[{"count":70,"href":"https:\/\/gaia.ub.edu\/index.php?rest_route=\/wp\/v2\/pages\/927\/revisions"}],"predecessor-version":[{"id":10602,"href":"https:\/\/gaia.ub.edu\/index.php?rest_route=\/wp\/v2\/pages\/927\/revisions\/10602"}],"up":[{"embeddable":true,"href":"https:\/\/gaia.ub.edu\/index.php?rest_route=\/wp\/v2\/pages\/332"}],"wp:attachment":[{"href":"https:\/\/gaia.ub.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=927"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}