{"id":6,"date":"2024-04-04T06:59:58","date_gmt":"2024-04-04T03:59:58","guid":{"rendered":"https:\/\/sisu.ut.ee\/aret\/15-meter-telescope-tartu-observatory\/"},"modified":"2024-12-05T18:35:49","modified_gmt":"2024-12-05T16:35:49","slug":"15-meter-telescope-tartu-observatory","status":"publish","type":"page","link":"https:\/\/sisu.ut.ee\/aret\/15-meter-telescope-tartu-observatory\/","title":{"rendered":"1.5-meter telescope of Tartu observatory"},"content":{"rendered":"\n\n\n
* 58\u00b015\u201956.7\u2033 North * 26\u00b027\u201934.9\u2033 East *<\/span>
\n\"1.5-m<\/td>\n		\"Telescope
\nSee larger scheme<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The 1.5-meter reflector AZT-12<\/strong> is the largest optical telescope in Northern Europe. It was manufactured in Leningrad (now Saint Petersburg) by LOMO (Russian: \u041b\u0435\u043d\u0438\u043d\u0433\u0440\u0430\u0434\u0441\u043a\u043e\u0435 O\u043f\u0442\u0438\u043a\u043e-M\u0435\u0445\u0430\u043d\u0438\u0447\u0435\u0441\u043a\u043e\u0435 O\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, lit. \u2018Leningrad Optical Mechanical Association\u2019) and installed at Tartu Observatory in 1974-1975. The telescope was officially opened for astronomical observations on October 21, 1976. Telescope control system was automated in 2011.<\/p>\n\n\n\n\n
Parameters of the telescope<\/strong><\/td>\n<\/tr>\n
\n\n\n\n\n\n\n\n\n\n
Main mirror<\/strong><\/td>\n<\/tr>\n
\n
Diameter\nRadius of curvature\nWeight\n<\/pre>\n<\/td>\n
\n
1.5 m \n-10554.69 mm\n850 kg\n<\/pre>\n<\/td>\n<\/tr>\n
\n
Primary-to-secondary distance<\/pre>\n<\/td>\n
\n
4144.31 mm<\/pre>\n<\/td>\n<\/tr>\n
Secondary mirror<\/strong><\/td>\n<\/tr>\n
\n
Diameter\nRadius of curvature\nConic value e2<\/sup>\n<\/pre>\n<\/td>\n
\n
0.36 m \n-2904.57 mm\n2.444605   \n<\/pre>\n<\/td>\n<\/tr>\n
<\/td>\n<\/tr>\n
\n
Height of the telescope\nLength of the tube\nDiameter of the dome<\/pre>\n<\/td>\n
\n
7.26 m\n6.5 m\n15 m<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n
\n\n\n\n\n\n\n\n\n
Primary focus<\/strong><\/td>\n<\/tr>\n
\n
Focal length\nFocal ratio\nField of view\n<\/pre>\n<\/td>\n
\n
5.28 m\n1\/3.51  \n0.07\u00b0 \n<\/pre>\n<\/td>\n<\/tr>\n
Cassegrain focus<\/strong><\/td>\n<\/tr>\n
\n
Focal length\nFocal ratio\nField of view\nPlate scale\n<\/pre>\n<\/td>\n
\n
24 m\n1\/16  \n0.34\u00b0 \n116 \u03bcm\/''\n<\/pre>\n<\/td>\n<\/tr>\n
Coud\u00e9 focus<\/strong><\/td>\n<\/tr>\n
\n
Focal length\nFocal ratio\nField of view\n<\/pre>\n<\/td>\n
\n
52.8 m\n1\/35.2  \n0.083\u00b0 \n<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n
\n\n\n\n\n\n\n
Guide<\/strong><\/td>\n<\/tr>\n
\n
Diameter of objective\nFocal length\nMagnification   max\n                min\nField of view\n<\/pre>\n<\/td>\n
\n
0.3 m\n4 m\nx<\/span>400  \nx<\/span>71  \n0.1\u00b0- 0.6\u00b0 \n<\/pre>\n<\/td>\n<\/tr>\n
Finder<\/strong><\/td>\n<\/tr>\n
\n
Diameter of objective\nFocal length\nMagnification   max\nField of view\n<\/pre>\n<\/td>\n
\n
0.1 m\n1 m\nx<\/span>18 \n2.5\u00b0 \n<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Since mid-80s the main instrument has been the longslit spectrograph ASP-32<\/strong> (also manufactured by LOMO), which has 10 exchangeable diffraction gratings for 300 \u2013 1100 nm<\/strong> wavelenth range.<\/p>\n\n\n\n\n\n\n\n\n
Grating
\n(lines\/mm)<\/td>\n		Single exposure
\ncoverage (\u00c5)<\/td>\n		Dispersion
\n(\u00c5\/mm)<\/td>\n<\/tr>\n
2400<\/td>\n247<\/td>\n10<\/td>\n<\/tr>\n
1800<\/td>\n270<\/td>\n10.6<\/td>\n<\/tr>\n
1200<\/td>\n750<\/td>\n29.3<\/td>\n<\/tr>\n
600<\/td>\n2060<\/td>\n80.6<\/td>\n<\/tr>\n
300<\/td>\n4500<\/td>\n175<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Camera Andor Newton DU970<\/strong>
\n\u2013 1600\u00d7200 pix, 16 \u03bcm\/pix
\n\u2013 Cooled thermoelectrically to -90 C<\/p>\n
\n
In 2024-25 the spectrograph ASP-32 will be replaced by fiber-fed Echelle spectrograph Whoppshel<\/a> <\/strong>with spectral resolution R = 30000<\/span>
\n<\/p>\n","protected":false},"excerpt":{"rendered":"
* 58\u00b015\u201956.7\u2033 North * 26\u00b027\u201934.9\u2033 East * See larger scheme The 1.5-meter reflector AZT-12 is the largest optical telescope in Northern Europe. It was manufactured in Leningrad (now Saint Petersburg) by LOMO (Russian: \u041b\u0435\u043d\u0438\u043d\u0433\u0440\u0430\u0434\u0441\u043a\u043e\u0435 O\u043f\u0442\u0438\u043a\u043e-M\u0435\u0445\u0430\u043d\u0438\u0447\u0435\u0441\u043a\u043e\u0435 O\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, lit. \u2018Leningrad Optical Mechanical …<\/p>\n","protected":false},"author":244,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"class_list":["post-6","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/sisu.ut.ee\/aret\/wp-json\/wp\/v2\/pages\/6","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sisu.ut.ee\/aret\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sisu.ut.ee\/aret\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sisu.ut.ee\/aret\/wp-json\/wp\/v2\/users\/244"}],"replies":[{"embeddable":true,"href":"https:\/\/sisu.ut.ee\/aret\/wp-json\/wp\/v2\/comments?post=6"}],"version-history":[{"count":5,"href":"https:\/\/sisu.ut.ee\/aret\/wp-json\/wp\/v2\/pages\/6\/revisions"}],"predecessor-version":[{"id":87,"href":"https:\/\/sisu.ut.ee\/aret\/wp-json\/wp\/v2\/pages\/6\/revisions\/87"}],"wp:attachment":[{"href":"https:\/\/sisu.ut.ee\/aret\/wp-json\/wp\/v2\/media?parent=6"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}