[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/all2en\/wiki32\/spica-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/all2en\/wiki32\/spica-wikipedia\/","headline":"SPICA \u2014 Wikipedia","name":"SPICA \u2014 Wikipedia","description":"before-content-x4 A wikipedia article, free l’encyclop\u00e9i. after-content-x4 For homonymous items, see Spica. after-content-x4 Technical characteristics Mass at launch 3 000","datePublished":"2018-06-02","dateModified":"2018-06-02","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/all2en\/wiki32\/author\/lordneo\/#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/all2en\/wiki32\/author\/lordneo\/","image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/44a4cee54c4c053e967fe3e7d054edd4?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/44a4cee54c4c053e967fe3e7d054edd4?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"Enzyklop\u00e4die","logo":{"@type":"ImageObject","@id":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","url":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/a\/ac\/SPICA_ISAS_201610.png\/290px-SPICA_ISAS_201610.png","url":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/a\/ac\/SPICA_ISAS_201610.png\/290px-SPICA_ISAS_201610.png","height":"394","width":"290"},"url":"https:\/\/wiki.edu.vn\/all2en\/wiki32\/spica-wikipedia\/","wordCount":1895,"articleBody":"     (adsbygoogle = window.adsbygoogle || []).push({});before-content-x4A wikipedia article, free l’encyclop\u00e9i.        (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4For homonymous items, see Spica.        (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4 Technical characteristics Mass at launch 3 000 kg Main instruments SMI Average infrared imaging spectrometer (12-36 \u03bcm) SAFARI Far infrared imaging spectrometer (34-210 \u03bcm) modifier  SPICA ( SPace Infrared telescope for Cosmology and Astrophysics ), is an infrared space telescope project offered by the Japanese aerospace exploration agency Jaxa with significant participation from the European Space Agency. The observatory includes a telescope with a diameter of 2.5 meters operating in medium and distant infrared. The sensors cooled at a temperature of 50 milli-kelvin without having to use a cryogenic liquid allow a significantly higher sensitivity to its predecessor Herschel. For Japanese astronomers, Spica takes over from the Akari infrared telescope. Spica is one of the three pre-selected projects in May 2018 For the M5 average mission of the COSMIC Vision scientific program of ESA which must be launched in 2032. The final selection is scheduled in 2021. In October 2020 , ESA and Jaxa decide to abandon the project whose technical complexity is too expensive and to remove it from the competition.   Spica’s ability to observe with great definition and sensitivity in the average and distant infrared is used to study the formation of astronomical objects in dusty spaces of space where practically only this part of the electromagnetic spectrum is visible from space earthly. SPICA must make it possible to study [ first ] :        (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4SPICA is a space machine with a mass of 3.7 tonnes of cylindrical shape 7.5 meters long for a diameter of 4.5 meters. The 3 -meter diameter telescope has an optical field of 5 minutes of arc. Its sensors are cooled to 50 milli-kelvin without having recourse to a reserve of cryogenic liquid which limits either the size of the telescope or its sensitivity (Herschel). It includes 3 instruments [ 2 ] , [ 3 ] : SMI, infrared camera and spectrophotometer function in the infrared means (5-38 \u00b5m). SAFARI, Imaging spectrometer in distant infrared (34-210 \u00b5m) with an optical field of 2 ‘\u00d7 2’. This instrument is developed by the European space agency. He uses a new type of sensor called “your” ( Transition Edge Sensor ), which takes advantage of the superconductive properties of certain materials when their temperature is lowered to 50 millikelvins. B-bop, polarimetric bolometer for the submillimetric (70,200 and 350 \u00b5m) The passive thermal control system consists of a sun visor and three thermal coatings. The active system includes two Stirling mechanical refrigerators with two redundant stages. The telescope generates a data flow of 350 gigabits\/day. Telecommunications are made of X strip and S band thanks to 3 low -gain antennas, 1 medium gain antenna and 1 large gain antenna. Satellite subsystems is fueled by solar panels providing 2.8 kW. It is stabilized on 3 axes by reaction wheels. Four-firing engines of 23 Newtons of Pushing and 8 of 3 Newtons of Pushes are used for trajectory corrections. They can provide a total delta-d of 110  m\/s thanks to 300 kg d’Ergols [ 2 ] . The SPICA Observatory must be put into orbit by a next generation of Japanese launcher H3 from the Tanegashima launch base. From there, he must join the point of Lagrange L 2 around which he describes an orbit of halo for a period of 180 days. The mission is to last three years with a period of five years [ 4 ] . The project has been set up for many years and its launch date initially planned for the early 2010s, is regularly postponed. Spica is one of the 25 projects proposed for the M5 average mission of the Cosmic Vision program of ESA which must be launched in 2032. It is one of the three projects pre-selected in May 2018 . The final selection must take place in 2021 [ 5 ] , [ 6 ] . Finally, the October 15, 2020 , ESA and Jaxa announce that Spica is no longer in competition because constraints and technical complexity are not compatible with the available budget [ 7 ] . \u2191 (in)  ‘ SPICA SCIENTIFIC OBJECTIVES \u00bb , Cnes (consulted the July 12, 2011 )  \u2191 a et b (in)  ‘ SPICA SATELLITE \u00bb , Cnes (consulted the July 12, 2011 )  \u2191 (in)  ‘ Safari instrument \u00bb , Cnes (consulted the July 12, 2011 )  \u2191 (in)  ‘ SPICA Mission \u00bb , Cnes (consulted the July 12, 2011 )  \u2191  Stefan Barensky, ‘ Cosmic Vision: Three candidates for M5 \u00bb , on Aerospatium , May 10, 2018  \u2191 (in) Stefan Barensky, ‘ ESA selects three new mission concepts for study\u00bb , European space agency, May 7, 2018  \u2191 (in) THAT, ‘ Spica no longer candidate for ESA’S M5 mission selection \u00bb , on SCI.ESA.INT , October 15, 2020 (consulted the October 15, 2020 )  Bibliography [ modifier | Modifier and code ] Related articles [ modifier | Modifier and code ] external links [ modifier | Modifier and code ]        (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4"},{"@context":"http:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"https:\/\/wiki.edu.vn\/all2en\/wiki32\/#breadcrumbitem","name":"Enzyklop\u00e4die"}},{"@type":"ListItem","position":2,"item":{"@id":"https:\/\/wiki.edu.vn\/all2en\/wiki32\/spica-wikipedia\/#breadcrumbitem","name":"SPICA \u2014 Wikipedia"}}]}]