{"id":2008,"date":"2021-12-13T10:56:29","date_gmt":"2021-12-13T09:56:29","guid":{"rendered":"https:\/\/stel.asu.cas.cz\/en\/?page_id=2008"},"modified":"2026-03-13T22:00:22","modified_gmt":"2026-03-13T21:00:22","slug":"photometric-camera","status":"publish","type":"page","link":"https:\/\/stel.asu.cas.cz\/en\/telescope\/instrumentation\/photometric-camera\/","title":{"rendered":"Photometric camera"},"content":{"rendered":"\n
\"This
The primary focus with the CCD camera for optical imaging. Credit: Miroslav \u0160lechta.<\/figcaption><\/figure>\n\n\n\n

The photometric camera G2-1000BI (Moravian Instruments) with E2V CCD 47-10<\/a> chip is installed in the primary focus. The focal length of the main mirror is 9 m (focal ratio f\/4.5), but the correcting lens changes the effective focal length in primary focus to 7 m (focal ratio to f\/3.5). The automatic exchange of the instruments between spectroscopic (fibers) and photometric (primary focus camera) configuration can be done within 1\u00a0minute. The camera is equipped with five position rotating filter wheel with different filters and cooled up electronically (down to -40\u00b0 C under ambient) by Peltier cell.<\/p>\n\n\n\n

Camera and chip<\/span><\/h5>\n\n\n\n
\n\n\n\n\n
ADC<\/strong><\/td>\nResolution<\/strong><\/td>\nPixel size<\/strong><\/td>\nRead. noise<\/strong><\/td>\nEfficiency<\/strong><\/td>\nLinearity<\/strong><\/td>\nReading<\/strong><\/td>\n<\/tr>\n
16 bit<\/strong><\/td>\n1056 x 1027 (1024×1024)<\/strong><\/td>\n13 x 13 <\/strong>\u03bcm<\/strong><\/td>\n9 ADU<\/strong><\/td>\n90% <\/strong>(500-700 nm)<\/strong><\/sub><\/td>\n> 95 %<\/strong><\/td>\n10 s<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n\n\n\n
Camera and telescope<\/span><\/h5>\n\n\n
\n\n\n\n\n
Effective focal length<\/strong><\/td>\nField of view<\/strong><\/td>\nAngular resolution<\/strong><\/td>\nTest image<\/a><\/strong><\/td>\n<\/tr>\n
7 000 mm<\/strong><\/td>\n6.3′ x 6.3′<\/strong><\/td>\n0.385 “\/pixel<\/strong><\/td>\n\n
\"\"<\/a><\/figure>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n\n\n
Photometric filters<\/span><\/h5>\n\n\n\n

The camera is equipped with five position rotating filter wheel with different filters. Complete list of available filters: Sloan u’, Sloan g’, Sloan r’, Sloan i’, Sloan z’, H-alpha, [O-III], [S-II], Bessel B, Bessel V, Bessel R, Bessel I. Narrow band filters have bandpass width 3 nm.<\/p>\n\n\n\n

Currently installed filters<\/strong> (see the table).<\/p>\n\n\n\n

<\/p>\n\n\n\n\n
Position<\/strong><\/td>\n0<\/strong><\/td>\n1<\/strong><\/td>\n2<\/strong><\/td>\n3<\/strong><\/td>\n4<\/strong><\/td>\n<\/tr>\n
Filter<\/strong><\/td>\nH-alpha<\/strong><\/td>\ni’ (SSDS)<\/strong><\/td>\nr’ (SSDS)<\/strong><\/td>\ng’ (SSDS)<\/strong><\/td>\nu’ (SSDS)<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n\n\n\n
Camera and telescope performance (in good seeing conditions)<\/span><\/h5>\n\n\n\n
Brightness<\/strong><\/td>Exposure<\/strong><\/td>Filter<\/strong><\/td>Measurement error<\/strong><\/td>\u03a7<\/strong><\/td><\/tr>
~ 12.5 mag<\/td>8 s<\/td>r’<\/td>~ 0.002 mag<\/td>~ 1,05<\/td><\/tr>
~ 15.2 mag<\/td>8 s<\/td>r’<\/td>~ 0.006 mag<\/td>~ 1,10<\/td><\/tr>
~ 16.2 mag<\/td>10 s<\/td>g’<\/td>~ 0.020 mag<\/td>~ 2,20<\/td><\/tr>
~ 18.3 mag<\/td>20 s<\/td>g’<\/td>~ 0.030 mag<\/td>~ 1,10<\/td><\/tr>
~ 23.3 mag<\/td>7 h<\/td>r’<\/td>~ 0.160 mag<\/td>~ 1,40<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

<\/p>\n\n\n

\n
\"\"
Magnitude (Sloan r) limit after 60s exposure in different air mass. <\/figcaption><\/figure><\/div>","protected":false},"excerpt":{"rendered":"

The photometric camera G2-1000BI (Moravian Instruments) with E2V CCD 47-10 chip is installed in the primary focus. The focal length of the main mirror is<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":490,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2008","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/pages\/2008","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/comments?post=2008"}],"version-history":[{"count":66,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/pages\/2008\/revisions"}],"predecessor-version":[{"id":5606,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/pages\/2008\/revisions\/5606"}],"up":[{"embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/pages\/490"}],"wp:attachment":[{"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/media?parent=2008"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}