{"id":2044,"date":"2026-07-01T21:18:54","date_gmt":"2026-07-01T12:18:54","guid":{"rendered":"https:\/\/www.nro.nao.ac.jp\/?page_id=2044"},"modified":"2026-07-02T00:38:32","modified_gmt":"2026-07-01T15:38:32","slug":"datasheets","status":"publish","type":"page","link":"https:\/\/www.nro.nao.ac.jp\/en\/projects\/45m\/datasheets\/","title":{"rendered":"Datasheets of the 45m telescope"},"content":{"rendered":"\n<ul class=\"wp-block-list\">\n<li><a href=\"\/en\/projects\/45m\/datasheets#System-Overview\">System Overview<\/a><\/li>\n\n\n\n<li><a href=\"\/en\/projects\/45m\/datasheets#Antenna\" data-type=\"internal\" data-id=\"#Antenna\">Antenna<\/a><\/li>\n\n\n\n<li><a href=\"\/en\/projects\/45m\/datasheets#Frontends\" data-type=\"internal\" data-id=\"#Frontends\">Frontends<\/a><\/li>\n\n\n\n<li><a href=\"\/en\/projects\/45m\/datasheets#Backends\" data-type=\"internal\" data-id=\"#Backends\">Backends<\/a><\/li>\n\n\n\n<li><a href=\"\/en\/projects\/sam45#Distribution-of-IFs-to-Backend\">Distribution of IFs to Backends<\/a><\/li>\n\n\n\n<li><a href=\"\/en\/projects\/sam45#observing-modes\">Observing Modes<\/a><\/li>\n\n\n\n<li><a href=\"\/en\/projects\/45m\/observations\/calibrations\/\">Absolute Intensity Calibration<\/a><\/li>\n\n\n\n<li><a href=\"\/en\/projects\/45m\/datasheets#Observations-and-Monitors\">Observations and Monitors<\/a><\/li>\n\n\n\n<li><a href=\"\/en\/projects\/45m\/data\/\">Data Downloads and Reduction<\/a><\/li>\n\n\n\n<li><a href=\"\/en\/projects\/45m\/datasheets#Appendix\" data-type=\"internal\" data-id=\"#Appendix\">Appendix<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This status report summarises the instrumental status of the Nobeyema 45-m radio telescope such as an antenna, receivers, and backends.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-0\">Important Notice<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The continuum mode for science target observation is not offered in open use. The continuum mode is only available for pointing observations.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"System-Overview\" class=\"wp-block-heading\">System Overview<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Nobeyama 45-m Telescope is one of the largest millimetre radio telescopes in the world. <\/li>\n\n\n\n<li>The 45-m Telescope covers a frequency range of 20 \u2013 116 GHz with several receivers. <\/li>\n\n\n\n<li>Mirrors in optics part are used for the receiver selection. <\/li>\n\n\n\n<li>Output signals from a receiver (IF signals) are processed in the IF chains, and fed to backends. <\/li>\n\n\n\n<li>There are two backends, one is \u201cSAM45\u201d for spectroscopic observations, and the other is \u201cContinuum BE\u201d for continuum observations.<\/li>\n<\/ul>\n\n\n\n<h3 id=\"capability\" class=\"wp-block-heading\">A capability of the Nobeyama 45-m Telescope for this season<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>(*1) Beam squint of H22 respect to H40 is \u223c4 arcsec., which is small enough compared to the beam size of H22 (\u223c72 arcsec.) for most of the observations. <\/li>\n\n\n\n<li>(*2) Beam squint of H22 respect to Z40 is \u223c2 arcsec. (see <a href=\"\/wp-content\/uploads\/2026\/06\/acceptancereview.H22Z45-1.pdf\" data-type=\"link\" data-id=\"acceptancereview.H22+Z45.pdf\">acceptance report material<\/a><span class=\"keiko_blue\"> <\/span>for detail), which is small enough compared to the beam size of H22 (\u223c72 arcsec.) for most of the observations.<\/li>\n\n\n\n<li>(*3) For observatiosn of 72 GHz band, FOREST can be used, but the optimal tuning parameters are not searched completely. Typical Tsys are (72 GHz) 300 K, (80 \u2013 110 GHz) 150 K, and (115 GHz) 300 K. <\/li>\n\n\n\n<li>(*4) From the limitation of the number of backend (16), two IFs of four have to be choiced.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Links to each sub-system for detail\n<ul class=\"wp-block-list\">\n<li><a href=\"\/en\/projects\/45m\/datasheets\/Antenna\" data-type=\"internal\" data-id=\"#Antenna\">Antenna<\/a><\/li>\n\n\n\n<li><a href=\"\/en\/projects\/45m\/datasheets#Frontends\" data-type=\"internal\" data-id=\"#Frontends\">Frontend<\/a>\n<ul class=\"wp-block-list\">\n<li><a href=\"\/projects\/h22\/\" data-type=\"link\" data-id=\"\/projects\/h22\/\">H22<\/a><\/li>\n\n\n\n<li><a href=\"\/projects\/h40\/\" data-type=\"link\" data-id=\"\/projects\/h40\/\">H40<\/a><\/li>\n\n\n\n<li><a href=\"\/projects\/z45\/\" data-type=\"link\" data-id=\"\/projects\/z45\/\">Z45<\/a><\/li>\n\n\n\n<li><a href=\"\/projects\/forest\/\" data-type=\"link\" data-id=\"\/projects\/forest\/\">FOREST<\/a><\/li>\n\n\n\n<li>H22 + H40 simultaneous<\/li>\n\n\n\n<li>H22 + Z45 simultaneous<\/li>\n\n\n\n<li>HINOTORI-TZ (Risk share)<\/li>\n\n\n\n<li>7BEE (Risk share)<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><a href=\"\/projects\/45m\/datasheets#Backends\" data-type=\"internal\" data-id=\"#Backends\">Backend<\/a>\n<ul class=\"wp-block-list\">\n<li><a href=\"\/projects\/sam45\/\" data-type=\"link\" data-id=\"\/sam45\">SAM45<\/a><\/li>\n\n\n\n<li><a href=\"\/projects\/continuum-be\/\" data-type=\"page\" data-id=\"1091\">Continuum BE<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-3\">Location of the Nobeyama 45-m Telescope<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Longitude: E 138<sup>d<\/sup> 28<sup>m<\/sup> 21.2<sup>s<\/sup> <\/li>\n\n\n\n<li>Latitude: N 35<sup>d<\/sup> 56<sup>m<\/sup> 40.9<sup>s<\/sup> <\/li>\n\n\n\n<li>Altitude: 1,350 m<\/li>\n\n\n\n<li><a href=\"https:\/\/www.google.co.jp\/maps\/place\/35%C2%B056'40.3%22N+138%C2%B028'21.1%22E\/@35.9444424,138.4711477,537m\/data=!3m1!1e3!4m14!1m7!3m6!1s0x0:0x0!2zMzXCsDU2JzQwLjkiTiAxMzjCsDI4JzIxLjIiRQ!3b1!8m2!3d35.9446944!4d138.4725556!3m5!1s0x0000000000000000:0x5bd8c129008ed34a!7e2!8m2!3d35.94453!4d138.4725191\" target=\"_blank\" rel=\"noreferrer noopener\">Pinpointing the Nobeyama 45-m Telescope on Google Map<\/a><\/li>\n<\/ul>\n\n\n\n<h2 id=\"Antenna\" class=\"wp-block-heading\">Antenna<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">Beam Size and Efficiency<\/h3>\n\n\n\n<figure class=\"wp-block-image aligncenter\"><img decoding=\"async\" src=\"https:\/\/www.nro.nao.ac.jp\/~nro45mrt\/html\/prop\/status\/images\/Efficiency_StatusReport2021.png\" alt=\"Antenna Efficiency\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Notes: The errors of the efficiencies are mainly due to the uncertainty of brightness temperature of the planets.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">(*) Based on the relative measurements between normal and filter modes.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Users are recommended to avoid to observe targets located within 30 degrees from the Sun because the thermal deformation of the antenna degrades the efficiencies. <\/li>\n\n\n\n<li>Users who would like to observe the Sun or targets near the Sun should take care of them. <\/li>\n\n\n\n<li>Additional information is available <a href=\"\/en\/projects\/45m\/datasheets\/antenna\/efficiency\/\" data-type=\"link\" data-id=\"\/projects\/45m\/datasheets\/antenna\/efficiency\/\">here<\/a>.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">Pointing Accuracy and Strategy<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Typical accuracy of \u223c3 arcsec (rms) will be achieved by\n<ul class=\"wp-block-list\">\n<li>five-point cross observations of a SiO maser (spectroscopy observations) <\/li>\n\n\n\n<li>or<\/li>\n\n\n\n<li>cross scan observations of planets (continuum observations)<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>List of pointing sources:\n<ul class=\"wp-block-list\">\n<li>SiO maser: <a href=\"https:\/\/www2.nro.nao.ac.jp\/~nro45mrt\/html\/obs\/sio-maser.html\">web page<\/a>, <a href=\"https:\/\/www.nro.nao.ac.jp\/wp-content\/uploads\/2026\/06\/SiOmaser-1.csv\" data-type=\"attachment\" data-id=\"1109\">CSV file<\/a><\/li>\n\n\n\n<li>Continuum: <a href=\"https:\/\/www.nro.nao.ac.jp\/wp-content\/uploads\/2026\/06\/source_cont.csv\" data-type=\"attachment\" data-id=\"1110\">CSV file<\/a>; Please check the recent flux of source. (e.g., <a href=\"http:\/\/sma1.sma.hawaii.edu\/callist\/callist.html\" target=\"_blank\" rel=\"noreferrer noopener\">Submillimeter Calibrator List @ SMA<\/a>)<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>It is appropriate to conduct a pointing measurement and correction every 1 \u2013 1.5 hours.\n<ul class=\"wp-block-list\">\n<li>It is appropriate to conduct a pointing measurement and correction every 30 minutes during the sunrise and sunset when the outside temperature changes drastically.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>The pointing accuracy above is achievable for wind speed of less than 4 m\/s. It can be degraded if wind velocity exceeds 10 m\/s. <\/li>\n\n\n\n<li>Users are recommended to avoid to observing targets located within 30 degrees from the Sun because the thermal deformation of the antenna degrades the pointing accuracy. <\/li>\n\n\n\n<li>Users who would like to observe the Sun or targets near the Sun should take care of them.<\/li>\n\n\n\n<li>For the simultaneous observations with H22 and H40 receivers:\n<ul class=\"wp-block-list\">\n<li>Pointing measurements should be done with H40 receiver.<\/li>\n\n\n\n<li>Please note that the beam squint of H22 respect to H40 is \u223c4 arcsec., which is small enough compared to the beam size of H22 (\u223c72 arcsec.) for most of the observations.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">misc.<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Definitions of\n<ul class=\"wp-block-list\">\n<li>Az = 0 deg for north, 90 deg for east<\/li>\n\n\n\n<li>El = 90 deg for zenith<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 id=\"Frontends\" class=\"wp-block-heading\">Frontends<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"\/projects\/h22\/\" data-type=\"link\" data-id=\"\/projects\/h22\/\">H22<\/a><\/li>\n\n\n\n<li><a href=\"\/projects\/h40\/\" data-type=\"link\" data-id=\"\/projects\/h40\/\">H40<\/a><\/li>\n\n\n\n<li><a href=\"\/projects\/z45\/\" data-type=\"link\" data-id=\"\/projects\/z45\/\">Z45<\/a><\/li>\n\n\n\n<li><a href=\"\/projects\/forest\/\" data-type=\"link\" data-id=\"\/projects\/forest\/\">FOREST<\/a><\/li>\n\n\n\n<li>H22 + H40 simultaneous<\/li>\n\n\n\n<li>H22 + Z45 simultaneous<\/li>\n\n\n\n<li>HINOTORI-TZ (Risk share)<\/li>\n\n\n\n<li>7BEE (Risk share)<\/li>\n<\/ul>\n\n\n\n<h2 id=\"Backends\" class=\"wp-block-heading\">Backends<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"\/projects\/sam45\/\">SAM45<\/a><\/li>\n\n\n\n<li><a href=\"\/projects\/continuum-be\/\">Continuum BE<\/a><\/li>\n<\/ul>\n\n\n\n<h2 id=\"Observations-and-Monitors\" class=\"wp-block-heading\">Observations and Monitors<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">Remote Observation<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Please see <a href=\"https:\/\/www.nro.nao.ac.jp\/en\/projects\/45m\/observations\/#Institute\" data-type=\"page\" data-id=\"786\">Remote Observation<\/a>\n<ul class=\"wp-block-list\">\n<li>from Mitaka Campus, National Astronomical Observatory of Japan<\/li>\n\n\n\n<li>from Your Home Institute in Japan<\/li>\n\n\n\n<li>from Academia Sinica Institute of Astronomy and Astrophysics (ASIAA) in Taiwan<\/li>\n\n\n\n<li>from Korea Astronomy and Space Science Institute (KASI) in Korea<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">Monitor<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Please see <a href=\"https:\/\/www2.nro.nao.ac.jp\/~nro45mrt\/html\/obs\/monitor-e.html\">Monitors<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This status report summarises the instrumental status of the Nobeyema 45-m radio telescope such as an antenna, &#8230; <\/p>\n","protected":false},"author":3,"featured_media":0,"parent":1928,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-1column.php","meta":{"_locale":"en_GB","_original_post":"https:\/\/www3.nro.nao.ac.jp\/?page_id=738","footnotes":""},"class_list":["post-2044","page","type-page","status-publish","en-GB","entry","nothumb"],"_links":{"self":[{"href":"https:\/\/www.nro.nao.ac.jp\/wp-json\/wp\/v2\/pages\/2044","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nro.nao.ac.jp\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.nro.nao.ac.jp\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.nro.nao.ac.jp\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nro.nao.ac.jp\/wp-json\/wp\/v2\/comments?post=2044"}],"version-history":[{"count":6,"href":"https:\/\/www.nro.nao.ac.jp\/wp-json\/wp\/v2\/pages\/2044\/revisions"}],"predecessor-version":[{"id":2135,"href":"https:\/\/www.nro.nao.ac.jp\/wp-json\/wp\/v2\/pages\/2044\/revisions\/2135"}],"up":[{"embeddable":true,"href":"https:\/\/www.nro.nao.ac.jp\/wp-json\/wp\/v2\/pages\/1928"}],"wp:attachment":[{"href":"https:\/\/www.nro.nao.ac.jp\/wp-json\/wp\/v2\/media?parent=2044"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}