{"id":16917,"date":"2018-10-25T10:39:57","date_gmt":"2018-10-25T14:39:57","guid":{"rendered":"http:\/\/hobbyspace.com\/Blog\/?p=16917"},"modified":"2018-10-25T10:39:57","modified_gmt":"2018-10-25T14:39:57","slug":"hubble-the-ghost-of-cassiopeia","status":"publish","type":"post","link":"https:\/\/hobbyspace.com\/Blog\/?p=16917","title":{"rendered":"Hubble: &#8220;The ghost of Cassiopeia&#8221;"},"content":{"rendered":"<p>The <a title=\"The ghost of Cassiopeia | ESA\/Hubble\" href=\"https:\/\/www.spacetelescope.org\/news\/heic1818\/?lang\">Hubble space telescope<\/a> offers a great view of the Ghost Nebula:<\/p>\n<p style=\"text-align: center;\"><strong><a title=\"The ghost of Cassiopeia | ESA\/Hubble\" href=\"https:\/\/www.spacetelescope.org\/news\/heic1818\/?lang\">The ghost of Cassiopeia<\/a><\/strong><\/p>\n<p><figure id=\"attachment_16918\" aria-describedby=\"caption-attachment-16918\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.spacetelescope.org\/images\/heic1818a\/\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"16918\" data-permalink=\"https:\/\/hobbyspace.com\/Blog\/?attachment_id=16918\" data-orig-file=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/10\/heic1818a1.jpg\" data-orig-size=\"700,710\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;ESA\/Hubble, NASA&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;IC 63 \\u2014 nicknamed the Ghost Nebula \\u2014 is about 550 light-years from Earth. The nebula is classified as both a reflection nebula \\u2014 as it is reflecting the light of a nearby star \\u2014 and as an emission nebula \\u2014 as it releases hydrogen-alpha radiation. Both effects are caused by the gigantic star Gamma Cassiopeiae. The radiation of this star is also slowly causing the nebula to dissipate.&quot;,&quot;created_timestamp&quot;:&quot;1540483200&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;The Ghost Nebula&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"The Ghost Nebula\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;IC 63 \u2014 nicknamed the Ghost Nebula \u2014 is about 550 light-years from Earth. The nebula is classified as both a reflection nebula \u2014 as it is reflecting the light of a nearby star \u2014 and as an emission nebula \u2014 as it releases hydrogen-alpha radiation. Both effects are caused by the gigantic star Gamma Cassiopeiae. The radiation of this star is also slowly causing the nebula to dissipate.&lt;\/p&gt;\n\" data-large-file=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/10\/heic1818a1.jpg\" class=\"wp-image-16918\" src=\"http:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/10\/heic1818a1.jpg\" alt=\"\" width=\"500\" height=\"507\" srcset=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/10\/heic1818a1.jpg 700w, https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/10\/heic1818a1-296x300.jpg 296w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><figcaption id=\"caption-attachment-16918\" class=\"wp-caption-text\"><em>IC 63 \u2014 nicknamed the Ghost Nebula \u2014 is about 550 light-years from Earth. The nebula is classified as both a reflection nebula \u2014 as it is reflecting the light of a nearby star \u2014 and as an emission nebula \u2014 as it releases hydrogen-alpha radiation. Both effects are caused by the gigantic star Gamma Cassiopeiae. The radiation of this star is also slowly causing the nebula to dissipate. [<a href=\"https:\/\/www.spacetelescope.org\/images\/heic1818a\/\" target=\"_blank\" rel=\"noopener\">Higher-res images<\/a>]<br \/><\/em><\/figcaption><\/figure>About 550 light-years away in the constellation of Cassiopeia lies IC 63, a stunning and slightly eerie nebula. Also known as the ghost of Cassiopeia, IC 63 is being shaped by radiation from a nearby unpredictably variable star, Gamma Cassiopeiae, which is slowly eroding away the ghostly cloud of dust and gas. This celestial ghost makes the perfect backdrop for the upcoming feast of All Hallow&#8217;s Eve \u2014 better known as Halloween.<\/p>\n<p>The constellation of <a href=\"https:\/\/en.wikipedia.org\/wiki\/Cassiopeia_(constellation)\">Cassiopeia<\/a>, named after a <a href=\"https:\/\/en.wikipedia.org\/wiki\/Cassiopeia_(Queen_of_Ethiopia)\">vain queen<\/a> in Greek mythology, forms the easily recognisable \u201cW\u201d shape in the night sky. The central point of the W is marked by a dramatic star named <a href=\"https:\/\/en.wikipedia.org\/wiki\/Gamma_Cassiopeiae\">Gamma Cassiopeiae<\/a>.<\/p>\n<p><span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"1600\" height=\"900\" src=\"https:\/\/www.youtube.com\/embed\/ovTtdrT_LoY?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=en&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span><\/p>\n<p style=\"padding-left: 30px;\"><em>This video zooms in on the emission and reflection nebula IC 63 \u2014 nicknamed the Ghost Nebula \u2014 about 550 light-years away. It starts with a view of the night sky as seen from the ground. It then zooms through observations from the Digitized Sky Survey 2, and ends with a view of the nebula obtained with the NASA\/ESA Hubble Space Telescope. <\/em><em>Credit: Hubble, Digitized Sky Survey 2, N. Risinger (<a href=\"http:\/\/skysurvey.org\/\" target=\"_blank\" rel=\"noopener\">skysurvey.org<\/a>). Music: Astral Electronic.<\/em><\/p>\n<p>The remarkable Gamma Cassiopeiae is a blue-white <a href=\"https:\/\/en.wikipedia.org\/wiki\/Subgiant\">subgiant<\/a> <a href=\"https:\/\/en.wikipedia.org\/wiki\/Variable_star\">variable<\/a> star that is surrounded by a gaseous disc. This star is 19 times more massive and 65 000 times brighter than our Sun. It also rotates at the incredible speed of 1.6 million kilometres per hour \u2014 more than 200 times faster than our parent star. This frenzied rotation gives it a squashed appearance. The fast rotation causes eruptions of mass from the star into a surrounding disk. This mass loss is related to the observed brightness variations.<\/p>\n<p>The radiation of Gamma Cassiopeiae is so powerful that it even affects IC 63, sometimes nicknamed the Ghost Nebula, that lies several light years away from the star. IC 63 is visible in this image taken by the <a href=\"http:\/\/www.spacetelescope.org\/\">NASA\/ESA Hubble Space Telescope<\/a>.<\/p>\n<p><figure id=\"attachment_16920\" aria-describedby=\"caption-attachment-16920\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"16920\" data-permalink=\"https:\/\/hobbyspace.com\/Blog\/?attachment_id=16920\" data-orig-file=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/10\/heic1818b1.jpg\" data-orig-size=\"700,548\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Ground-based view of the sky around IC 63\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;This image shows the sky around the nebula IC 63, nicknamed the Ghost Nebula. It was created from images forming part of the Digitized Sky Survey 2. The field of view is dominated by the bright star Gamma Cassiopeiae, which is having a profound influence on IC 63.&lt;\/p&gt;\n&lt;p&gt;IC 63 is only one of several nebulous structures surrounding Gamma Cassiopeiae \u2014 all of which are affected by the radiation emitted by the blue-white subgiant star.&lt;\/p&gt;\n&lt;p&gt;Credit:&lt;\/p&gt;\n&lt;p&gt;ESA\/Hubble, NASA, Digitized Sky Survey 2&lt;br \/&gt;\nAcknowledgement: Davide de Martin&lt;\/p&gt;\n\" data-large-file=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/10\/heic1818b1.jpg\" class=\"wp-image-16920\" src=\"http:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/10\/heic1818b1.jpg\" alt=\"\" width=\"500\" height=\"391\" srcset=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/10\/heic1818b1.jpg 700w, https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/10\/heic1818b1-300x235.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><figcaption id=\"caption-attachment-16920\" class=\"wp-caption-text\"><em>This image shows the sky around the nebula IC 63, nicknamed the Ghost Nebula. It was created from images forming part of the Digitized Sky Survey 2. The field of view is dominated by the bright star Gamma Cassiopeiae, which is having a profound influence on IC 63. IC 63 is only one of several nebulous structures surrounding Gamma Cassiopeiae \u2014 all of which are affected by the radiation emitted by the blue-white subgiant star. Credit: ESA\/Hubble, NASA, Digitized Sky Survey 2. Acknowledgement: Davide de Martin [<a href=\"https:\/\/www.spacetelescope.org\/images\/heic1818b\/\" target=\"_blank\" rel=\"noopener\">Higher-res images<\/a>]<br \/><\/em><\/figcaption><\/figure>The colours in the eerie nebula showcase how the nebula is affected by the powerful radiation from the distant star. The hydrogen within IC 63 is being bombarded with <a href=\"https:\/\/en.wikipedia.org\/wiki\/Ultraviolet\">ultraviolet radiation<\/a> from Gamma Cassiopeiae, causing its electrons to gain energy which they later release as <a href=\"https:\/\/en.wikipedia.org\/wiki\/H-alpha\">hydrogen-alpha<\/a> radiation \u2014 visible in red in this image.<\/p>\n<p>This hydrogen-alpha radiation makes IC 63 an <a href=\"https:\/\/en.wikipedia.org\/wiki\/Emission_nebula\">emission nebula<\/a>, but we also see blue light in this image. This is light from Gamma Cassiopeiae that has been reflected by dust particles in the nebula, meaning that IC 63 is also a <a href=\"https:\/\/en.wikipedia.org\/wiki\/Reflection_nebula\">reflection nebula<\/a>.<\/p>\n<p>This colourful and ghostly nebula is slowly dissipating under the influence of <a href=\"https:\/\/en.wikipedia.org\/wiki\/Ultraviolet\">ultraviolet radiation<\/a> from Gamma Cassiopeiae. However, IC 63 is not the only object under the influence of the mighty star. It is part of a much larger nebulous region surrounding Gamma Cassiopeiae that measures approximately two degrees on the sky \u2014 roughly four times as wide as \u00a0the full Moon.<\/p>\n<p><span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"1600\" height=\"900\" src=\"https:\/\/www.youtube.com\/embed\/yoGTgePFSt4?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=en&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span><\/p>\n<p style=\"padding-left: 30px;\"><em>This video pans across the nebula IC 63, often nicknamed the Ghost Nebula. This nebula is classified as both an emission and a reflection nebula. The hydrogen within IC 63 is being bombarded with radiation from the nearby star Gamma Cassiopeiae, causing its electrons to gain energy which they later emit as hydrogen-alpha radiation \u2014 visible in red in this image. The blue parts of IC 63 are created by dust particles in the nebula which reflect the light from Gamma Cassiopeiae. Credit: Hubble. Music: Johan B. Monell (<a href=\"http:\/\/www.johanmonell.com\" target=\"_blank\" rel=\"noopener\">www.johanmonell.com<\/a>).<\/em><\/p>\n<p>This region is best seen from the Northern Hemisphere during autumn and winter. Though it is high in the sky and visible all year round from Europe, it is very dim, so observing it requires a fairly large telescope and dark skies.<\/p>\n<p>From above Earth\u2019s atmosphere, Hubble gives us a view that we cannot hope to see with our eyes. This photo is possibly the most detailed image that has ever been taken of IC 63, and it beautifully showcases Hubble\u2019s capabilities.<\/p>\n<p><strong>More information<\/strong><\/p>\n<p>The Hubble Space Telescope is a project of international cooperation between ESA and NASA.<\/p>\n<p><strong>Links<\/strong><\/p>\n<ul>\n<li><a href=\"http:\/\/www.spacetelescope.org\/images\/archive\/category\/spacecraft\/\">Images of Hubble<\/a><\/li>\n<li><a href=\"http:\/\/hubblesite.org\/news_release\/news\/2018-42\">Hubblesite release<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>The Hubble space telescope offers a great view of the Ghost Nebula: The ghost of Cassiopeia About 550 light-years away in the constellation of Cassiopeia lies IC 63, a stunning and slightly eerie nebula. Also known as the ghost of Cassiopeia, IC 63 is being shaped by radiation from a nearby unpredictably variable star, Gamma &hellip; <a href=\"https:\/\/hobbyspace.com\/Blog\/?p=16917\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Hubble: &#8220;The ghost of Cassiopeia&#8221;<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[12],"tags":[],"class_list":["post-16917","post","type-post","status-publish","format-standard","hentry","category-astronomy"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p34aWK-4oR","jetpack-related-posts":[{"id":12527,"url":"https:\/\/hobbyspace.com\/Blog\/?p=12527","url_meta":{"origin":16917,"position":0},"title":"Hubble captures marvelous view of the Bubble Nebula to celebrate 26 years in orbit","author":"TopSpacer","date":"April 21, 2016","format":false,"excerpt":"ESA\/Hubble\u00a0celebrates 26 years in orbit with a wonderful new image of the\u00a0Bubble Nebula. 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This is the best view of the little-known object ESO 378-1 yet obtained and was captured by ESO\u2019s Very Large Telescope in northern Chile.","src":"https:\/\/i0.wp.com\/hobbyspace.com\/Blog\/wp-content\/uploads\/2015\/08\/eso1532a1-1024x947.jpg?resize=350%2C200","width":350,"height":200},"classes":[]}],"_links":{"self":[{"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=\/wp\/v2\/posts\/16917","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=16917"}],"version-history":[{"count":1,"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=\/wp\/v2\/posts\/16917\/revisions"}],"predecessor-version":[{"id":16921,"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=\/wp\/v2\/posts\/16917\/revisions\/16921"}],"wp:attachment":[{"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=16917"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=16917"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=16917"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}