{"id":79,"date":"2023-06-26T15:23:03","date_gmt":"2023-06-27T00:23:03","guid":{"rendered":"https:\/\/www.perc.it-chiba.ac.jp\/astr\/?page_id=79"},"modified":"2023-07-02T21:19:54","modified_gmt":"2023-07-03T06:19:54","slug":"instrument_spec","status":"publish","type":"page","link":"https:\/\/www.perc.it-chiba.ac.jp\/astr\/ubandinst\/instrument_spec\/","title":{"rendered":"U-band Instrument Specification"},"content":{"rendered":"\n<p><strong>Specification<\/strong><\/p>\n\n\n\n<ul>\n<li>detector: CMOS Gpixel GSENSE 400 BSI-UV: <a href=\"http:\/\/www.tanaka-opt.co.jp\/data\/GS400BSI.pdf\">specification [pdf]<\/a> \n<ul>\n<li>2048 x 2048 pixel (11 um\/pixel)<\/li>\n\n\n\n<li>readout noise: 1.4 e-\/pix<\/li>\n\n\n\n<li>camera module: <a href=\"http:\/\/www.tanaka-opt.co.jp\/fli-kl400bsi.html\">FLI KL400BI <\/a> w\/ G1 shutter, peltier cooler<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>optics: designed for 1.5m Kanata telescope (Hiroshima University)\n<ul>\n<li>@2nd Nasmyth focus (no rotator)<\/li>\n\n\n\n<li>optimized for 300-400nm<\/li>\n\n\n\n<li>F\/10.0<\/li>\n\n\n\n<li>field-of-view: 5.0 x 5.0 arcmin2<\/li>\n\n\n\n<li>pixel scale: 0.146 arcsec \/ pixel<\/li>\n\n\n\n<li>designed by PhotoCross<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>filters\n<ul>\n<li>u, g, r, u-short, u-long<\/li>\n\n\n\n<li>transmission curve (filter only): <a href=\"https:\/\/www.perc.it-chiba.ac.jp\/astr\/wp\/wp-content\/uploads\/2023\/06\/filters_bb_02.pdf\" data-type=\"attachment\" data-id=\"113\">figure<\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>total throughput at airmass=1.2 (<a href=\"https:\/\/www.perc.it-chiba.ac.jp\/astr\/wp\/wp-content\/uploads\/2023\/06\/throughput_v1_01.pdf\" data-type=\"attachment\" data-id=\"128\">figure<\/a>, <a href=\"https:\/\/www.perc.it-chiba.ac.jp\/astr\/wp\/wp-content\/uploads\/2023\/06\/sens_v7_Kanata_u_am1.2_0.0_throughput.txt\" data-type=\"attachment\" data-id=\"174\">ascii file<\/a>)\n<ul>\n<li>w\/o filters\n<ul>\n<li>0.04 at 310nm<\/li>\n\n\n\n<li>0.18 at 350nm<\/li>\n\n\n\n<li>0.30 at 400nm<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>w\/ u-band filter\n<ul>\n<li>0.09 at 330nm<\/li>\n\n\n\n<li>0.13 at 350nm<\/li>\n\n\n\n<li>0.14 at 360nm (peak)<\/li>\n\n\n\n<li>0.04 at 380nm<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>sensitivity by assuming nominal sky brightness (AB mag) \n\n\n\n\n\n\n\n\n\n\n<ul>\n<li>S\/N=5: 18.0-19.0 (t=10 sec), 19.0-20.0 (t=100 sec)<\/li>\n<\/ul>\n\n\n\n<ul>\n<li>S\/N=20: 16.5-17.5 (t=10 sec), 18.0-19.0 (t=100 sec)<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>stellar density in u-band\n<ul>\n<li>statistics from SDSS (i.e., high galactic latitude) u-band data: <a href=\"https:\/\/www.perc.it-chiba.ac.jp\/astr\/wp\/wp-content\/uploads\/2023\/06\/nc_sdss_v2_fig01.pdf\" data-type=\"attachment\" data-id=\"106\">figure<\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>maximum exposure time for a single exposure \/ image motion\n<ul>\n<li>no instrument\/image rotator available at 2nd Nasmyth focus of Kanata telescope<\/li>\n\n\n\n<li>~20-30 sec in most cases (background limit even in nominal sky brightness assumption above)<\/li>\n\n\n\n<li>depending on hour angle and object&#8217;s Declination<\/li>\n\n\n\n<li><a href=\"https:\/\/www.perc.it-chiba.ac.jp\/astr\/wp\/wp-content\/uploads\/2023\/06\/nasrotang2_kanata.pdf\" data-type=\"attachment\" data-id=\"110\">figure<\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>differential atmospheric dispersion\n<ul>\n<li><a href=\"https:\/\/www.perc.it-chiba.ac.jp\/astr\/wp\/wp-content\/uploads\/2023\/06\/diffatmdisp_v1_02.pdf\" data-type=\"attachment\" data-id=\"131\">figure<\/a><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Kanata telescope\n<ul>\n<li>tracking accuracy: 1-2 arcsec \/ 5 minutes<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>Schedule (as of June 23, 2023)<\/strong><\/p>\n\n\n\n<ul>\n<li>first light at Kanata telescope in FY2023 winter<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Specification Schedule (as of June 23, 2023)<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":154,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"_links":{"self":[{"href":"https:\/\/www.perc.it-chiba.ac.jp\/astr\/wp-json\/wp\/v2\/pages\/79"}],"collection":[{"href":"https:\/\/www.perc.it-chiba.ac.jp\/astr\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.perc.it-chiba.ac.jp\/astr\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.perc.it-chiba.ac.jp\/astr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.perc.it-chiba.ac.jp\/astr\/wp-json\/wp\/v2\/comments?post=79"}],"version-history":[{"count":25,"href":"https:\/\/www.perc.it-chiba.ac.jp\/astr\/wp-json\/wp\/v2\/pages\/79\/revisions"}],"predecessor-version":[{"id":177,"href":"https:\/\/www.perc.it-chiba.ac.jp\/astr\/wp-json\/wp\/v2\/pages\/79\/revisions\/177"}],"up":[{"embeddable":true,"href":"https:\/\/www.perc.it-chiba.ac.jp\/astr\/wp-json\/wp\/v2\/pages\/154"}],"wp:attachment":[{"href":"https:\/\/www.perc.it-chiba.ac.jp\/astr\/wp-json\/wp\/v2\/media?parent=79"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}