{"id":1984,"date":"2021-03-06T20:22:00","date_gmt":"2021-03-06T19:22:00","guid":{"rendered":"https:\/\/kosmos-os.de\/?p=1984"},"modified":"2023-10-26T12:14:13","modified_gmt":"2023-10-26T10:14:13","slug":"der-zwillingsquasar-qso-0957561ab","status":"publish","type":"post","link":"https:\/\/kosmos-os.de\/en\/der-zwillingsquasar-qso-0957561ab\/","title":{"rendered":"The Twin Quasar QSO 0957+561AB"},"content":{"rendered":"<p><br><\/p>\n\n\n\n<p>Dr. Gerold Holtkamp, 2021.03.06<\/p>\n\n\n\n<p><br><\/p>\n\n\n\n<p class=\"translation-block\">The moon had already risen at 22:30 MEZ on March 2, 2021, but was still low on the horizon. With 83% disk lit, it would soon become a fairly bright \"lantern\". However, the author was not deterred by this and nevertheless directed the telescope of the observatory of the Natural Science Association Osnabr\u00fcck to the so-called twin quasar QSO 0957+561AB. What we see on earth are two images of the same quasar produced by a so-called gravitational lens (-more information here-). With a brightness of just 16.7 or 16.5 mag of the two components and a distance of approx. 6'', a telescope with a mirror diameter of 60 cm is the right choice. The observation object was high - almost at the zenith - so that the telescope and dome slit had to \"dislocate\" quite a bit.<\/p>\n\n\n\n<p><br><em>(at mouseover marking)<\/em><\/p>\n\n\n\n<div class=\"wp-block-group has-global-padding is-content-justification-left is-layout-constrained wp-container-core-group-is-layout-8068945a wp-block-group-is-layout-constrained\">            <div class=\"oxi-addons-container noLightbox oxi-image-hover-wrapper-8\" id=\"oxi-image-hover-wrapper-8\">\n                <div class=\"oxi-addons-row\">\n                    \n            <div class=\"oxi-image-hover-style oxi-bt-col-lg-12 oxi-bt-col-md-12 oxi-bt-col-sm-12\" sa-data-animation=\"zoomIn\" sa-data-animation-offset=\"100%\" sa-data-animation-delay=\"0ms\" sa-data-animation-duration=\"1000ms\">\n                <div class=\"oxi-image-hover-style-general\">\n                    <div class=\"oxi-image-hover oxi-image-general-hover oxi-image-general-hover-style-1 oxi-image-general-hover-8-10\">\n                                                    <div class=\"oxi-image-hover-figure\">\n                                <div class=\"oxi-image-hover-image\">\n                                    <img decoding=\"async\" src=\"https:\/\/kosmos-os.de\/wp-content\/uploads\/2023\/07\/DSS-Auswertung1-fitswork_3-ausschnitt.jpg\" >\n                                <\/div>\n                                <div class=\"oxi-image-hover-figure-caption\">\n                                    <div class=\"oxi-image-hover-caption-tab   image-hover-align-center-center\">\n                                                                                    <div class=\"oxi-image-hover-figure-heading iheu-fade-up\"><h3 class=\"oxi-image-hover-heading\">\u00a0\u00a0 <\/h3><\/div>\n                                                                                    <\/div>\n                                <\/div>\n                            <\/div>\n                                                <\/div>\n                <\/div> \n                            <\/div> \n                            <\/div>\n            <\/div>\n\t\t\t\n<\/div>\n\n\n\n<p><em>Twin quasar QSO 0957+561AB<\/em><strong><br><\/strong><\/p>\n\n\n\n<p><br><\/p>\n\n\n\n<p>The visual separation of the two components has been successful. If these components can be separated, then perhaps the so-called Einstein cross \u2013 four pictures oft he same quasar separated  1.6''' should also be separable. A nice challenge ....<\/p>\n\n\n\n<p><br><\/p>\n\n\n\n<p>Technical data: <\/p>\n\n\n\n<p>Telescope: Cassegrain 60 cm mirror diameter, 745 cm focal length<\/p>\n\n\n\n<p>Filter: Hutech IDAS LPD2<\/p>\n\n\n\n<p>Camera: Canon 6D, ISO 3200 <\/p>\n\n\n\n<p>Shots: 13\u00d7300 s, dark, flats, flat darks<\/p>\n\n\n\n<p>Processing: DSS, fitswork<\/p>\n\n\n\n<p><br><\/p>","protected":false},"excerpt":{"rendered":"<p>The moon had already risen at night at 10:30 p.m. CET on March 2, 2021, but was still low on the horizon. With 83% illuminated pane, it would soon become a fairly bright \"lantern\". But the author was not deterred by this.<\/p>","protected":false},"author":2,"featured_media":1993,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[183],"tags":[],"class_list":["post-1984","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-quasare"],"_links":{"self":[{"href":"https:\/\/kosmos-os.de\/en\/wp-json\/wp\/v2\/posts\/1984","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kosmos-os.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kosmos-os.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kosmos-os.de\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/kosmos-os.de\/en\/wp-json\/wp\/v2\/comments?post=1984"}],"version-history":[{"count":11,"href":"https:\/\/kosmos-os.de\/en\/wp-json\/wp\/v2\/posts\/1984\/revisions"}],"predecessor-version":[{"id":2819,"href":"https:\/\/kosmos-os.de\/en\/wp-json\/wp\/v2\/posts\/1984\/revisions\/2819"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kosmos-os.de\/en\/wp-json\/wp\/v2\/media\/1993"}],"wp:attachment":[{"href":"https:\/\/kosmos-os.de\/en\/wp-json\/wp\/v2\/media?parent=1984"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kosmos-os.de\/en\/wp-json\/wp\/v2\/categories?post=1984"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kosmos-os.de\/en\/wp-json\/wp\/v2\/tags?post=1984"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}