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It specifies keyword meanings, units, formats, allowed values, and default settings for telescope guiding (e.g., code type, guide star coordinates, magnitude, proper motion, epoch and equinox), as well as sequencing options affecting fringe track exposures and whether specific calibration data products such as the dark and kappa matrix are acquired.",{"@graph":63,"@context":118},[64,80,101],{"@type":65,"itemListElement":66},"BreadcrumbList",[67,71,74,77],{"item":68,"name":69,"@type":70,"position":9},"https://docshare.wps.com","Home","ListItem",{"item":72,"name":10,"@type":70,"position":73},"https://docshare.wps.com/template/",2,{"item":75,"name":51,"@type":70,"position":76},"https://docshare.wps.com/template/general/",3,{"item":78,"name":59,"@type":70,"position":79},"https://docshare.wps.com/template/vlt-man-eso-270590-parameter-reference/195421/",4,{"url":78,"name":59,"@type":81,"image":82,"author":87,"headline":59,"publisher":90,"fileFormat":93,"inLanguage":57,"description":61,"dateModified":94,"datePublished":95,"encodingFormat":93,"isAccessibleForFree":96,"interactionStatistic":97},"DigitalDocument",{"url":83,"@type":84,"width":85,"height":86},"https://docshare.wps.com/thumbnails/vlt-man-eso-270590-parameter-reference/195421.png","ImageObject",442,249,{"name":88,"@type":89},"Aria Callaghan","Person",{"url":68,"name":91,"@type":92},"DocShare","Organization","application/pdf","2026-09-26","2026-09-03",true,{"@type":98,"interactionType":99,"userInteractionCount":79},"InteractionCounter",{"@type":100},"ViewAction",{"@type":102,"mainEntity":103},"FAQPage",[104,110,114],{"name":105,"@type":106,"acceptedAnswer":107},"What does TEL.COU.GSSOURCE control?","Question",{"text":108,"@type":109},"It determines the type of cloud/guide strategy: for SCIENCE it performs no off-target guiding, while for SETUPFILE it uses the guide star for off-target guiding.","Answer",{"name":111,"@type":106,"acceptedAnswer":112},"How are TEL.COU.ALPHA and TEL.COU.DELTA formatted?",{"text":113,"@type":109},"TEL.COU.ALPHA uses HH:MM:SS.SS and TEL.COU.DELTA uses DD:MM:SS.SS, representing right ascension and declination of the guide star.",{"name":115,"@type":106,"acceptedAnswer":116},"What do SEQ.DOIT and SEQ.NEXPO set?",{"text":117,"@type":109},"SEQ.NEXPO sets the number of fringe track exposures (integer 1 to 100). SEQ.DOIT determines whether specific calibration products are taken, such as the dark or the kappa matrix.","https://schema.org",{"og:url":78,"og:type":120,"og:title":59,"og:site_name":91,"og:description":61},"article",{"robots":122,"canonical":78},"index,follow",{"doc_id":124,"site_id":56},195421,1788448351,{"code":4,"msg":5,"data":127},{"doc_id":124,"user_id":128,"nickname":88,"user_avatar":129,"doc_module":9,"category_id":50,"category_name":51,"doc_title":59,"doc_description":61,"doc_content":130,"file_id":131,"file_url":132,"file_type":133,"file_size":134,"view_count":79,"is_deleted":4,"is_public":9,"is_downloadable":9,"audit_status":9,"page_count":15,"language":135,"language_code":57,"site_id":56,"html_lang":57,"table_of_contents":136,"faqs":137,"seo_title":138,"seo_description":61,"update_tm":125,"read_time":79},962084926284,"https://ap-avatar.wpscdn.com/davatar_29158cc5080c5b710cf443261637dec0","| Issue | Date | Section/Parag. a􀀋ected | Reason/Initiation/Documents/Remarks |\n| --- | --- | --- | --- |\n| 96 | 9 Apr, 2015 | All | Document creation |\n| 98 | 24 May, 2016 | 2.1 | Template sequence now consistent w/ p2pp Magnitude requirements for calibrators,\u003Cbr>cross-calibration between gains |\n| 102 | Jul 4, 2018 | All | Replaced P2PP speci􀀌c text with generic Phase-2 rules |\n| Editor: Thomas Rivinius, ESO Paranal Science Operations ; [triviniu@eso. org](triviniu@eso. org) |  |  |  |\n\n\n| Keyword name | Description | Unit, format, possible values | Default value |\n| --- | --- | --- | --- |\n\n\n| TEL. COU. GSSOURCE | Type of coud􀀓e guiding | SCIENCE: no o􀀋-target guiding, other COU . . keywords ignored SETUPFILE: o􀀋-target guiding, guide star used | SCIENCE |\n| --- | --- | --- | --- |\n| TEL. COU. ALPHA | Right ascension ofcoud􀀓e guide star | HH:MM:SS.SS\u003Cbr>(e.g.: 22:54:30.53 for 22 h 54 m 30.53 s) | 0 |\n| TEL. COU. DELTA | Declination of coud􀀓e\u003Cbr>guide star | DD:MM:SS.SS\u003Cbr>(e.g.: -16:22:45.91 for -16􀀎 22' 45.91\") | 0 |\n| TEL. COU. MAG | Visual magnitude of either the target or its coud􀀓e guide star (if the target is too faint for coud􀀓e guiding) | mV | 0 |\n| TEL. COU. PMA | Right ascension\u003Cbr>proper motion ofcoud􀀓e guide star | arcsec/year | 0 |\n| TEL. COU. PMD | Declination proper motion of coud􀀓e guide star | arcsec/year | 0 |\n| TEL. COU. EPOCH | Epoch of coordinates and proper motion ofcoud􀀓e guide star | year | 2000 |\n| TEL. COU. EQUINOX | Equinox of coordinate system in which coud􀀓e guide star coordinates are given | year | 2000 |\n| ISS . IAS . HMAG | Magnitude in H-band (1.6 􀀖m) of the target | mH | 0 |\n| INS . DISP . NAME | Dispersive element | FREE or GRISM | GRISM |\n\n\n| Keyword name | Description | Unit, format, possible values | Default value |\n| --- | --- | --- | --- |\n\n\n| SEQ . NEXPO | Number of fringe track exposures | integer value, 1 to 100 | 5 |\n| --- | --- | --- | --- |\n\n\n| Keyword name | Description | Unit, format, possible values | Default value |\n| --- | --- | --- | --- |\n\n\n| SEQ . DOIT | Determines whether the dark is taken | T/F | T |\n| --- | --- | --- | --- |\n\n\n| Keyword name | Description | Unit, format, possible values | Default value |\n| --- | --- | --- | --- |\n\n\n| SEQ . DOIT | Determines whether the kappa matrix is taken | T/F | T |\n| --- | --- | --- | --- |","cbCaia412qg045UT","https://ap.wps.com/l/cbCaia412qg045UT","pdf",167639,"English","# Keyword reference\n## Telescope guiding keywords\n## Sequence and calibration flags","[{\"question\":\"What does TEL.COU.GSSOURCE control?\",\"answer\":\"It determines the type of cloud/guide strategy: for SCIENCE it performs no off-target guiding, while for SETUPFILE it uses the guide star for off-target guiding.\"},{\"question\":\"How are TEL.COU.ALPHA and TEL.COU.DELTA formatted?\",\"answer\":\"TEL.COU.ALPHA uses HH:MM:SS.SS and TEL.COU.DELTA uses DD:MM:SS.SS, representing right ascension and declination of the guide star.\"},{\"question\":\"What do SEQ.DOIT and SEQ.NEXPO set?\",\"answer\":\"SEQ.NEXPO sets the number of fringe track exposures (integer 1 to 100). SEQ.DOIT determines whether specific calibration products are taken, such as the dark or the kappa matrix.\"}]","VLT-MAN-ESO-270590 - 说明性参数字典 | PDF"]