{"id":1108,"date":"2024-01-18T15:28:26","date_gmt":"2024-01-18T15:28:26","guid":{"rendered":"https:\/\/starscape-experiences.space\/?p=1108"},"modified":"2024-01-18T15:28:27","modified_gmt":"2024-01-18T15:28:27","slug":"installing-astroimagej-on-astroberry-pi4","status":"publish","type":"post","link":"https:\/\/starscape-experiences.space\/index.php\/2024\/01\/18\/installing-astroimagej-on-astroberry-pi4\/","title":{"rendered":"Installing AstroImageJ on Astroberry Pi4"},"content":{"rendered":"\n

I was looking to find a suitable plate solver for my fits files. I want such software because I would like to image NEA, minor planets and comets and report them to the Minor Planet Center<\/a>. Eventually, I am hoping to get an observatory code from them. I also want to measure separation angles between double and multiple stars. Astrometrica <\/a>is a great tool but it is paid software. Thus I switched to AstroImageJ <\/a>an extension to ImageJ <\/a>designed for astronomical images. <\/p>\n\n\n\n

AstroImageJ uses the nova.astrometry.net with stars from the Gaia-DR2 according to this post<\/a> (5200-series) and uses magnitudes in G<\/a> (the broadest of the Gaia photometric bandpasses). The issue is that KStars uses the Tycho-2 catalog (for offline plate solving) and I am unsure whether or not the positions match. I found only that proper motions and parallaxes in Gaia DR2 are independent of Tycho2<\/a> but nothing on positions. But if using the online solver with Kstars this should not be an issue as they both are going the nova.astrometry.net.<\/p>\n\n\n\n

Installing AstroImageJ on Linux machines is not an issue however the Pi4 Astroberry does not natively <\/strong>support JAVA versions higher than 11 and AstroImageJ 5.0.0 requires Java 17<\/strong>. And if you are looking for older versions to install that work on 11 you will not find any easily.<\/p>\n\n\n

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A bit of caution, the JRE that comes with the AstroImageJ archive does not work for the Pi4 as it is compiled for a different architecture.<\/p>\n\n\n\n

So, to make it work we must first download an OpenJDK 17 version for the arm architecture<\/a> and run the following commands that will create a folder containing all we need in Downloads <\/em>on our Pi4.<\/p>\n\n\n\n

cd ~\/Downloads\/\n\nwget https:\/\/github.com\/adoptium\/temurin17-binaries\/releases\/download\/jdk-17.0.1%2B12\/OpenJDK17U-jdk_arm_linux_hotspot_17.0.1_12.tar.gz\n\ntar xzfv OpenJDK17U-jdk_arm_linux_hotspot_17.0.1_12.tar.gz<\/code><\/pre>\n\n\n\n
This will create a jdk-17.0.1+12\/<\/em> folder in Downloads. In its bin <\/em>subfolder we will find the java executable that we need to run AstrometryJ.<\/p>\n\n\n\n
Now we need to download the AstrometryJ<\/a> 5.0.0 and follow the instructions here<\/a>.<\/p>\n\n\n\n
Before being able to run our AstroImageJ we must update the AstroImageJ.sh<\/em> script found in \/usr\/local\/AstroImageJ<\/em>. Two updates are required. First, the JAVA variable needs to point to our OpenJDK 17, and second, the JVM arguments specified in the AstroImageJ.l4j.ini<\/em> do not work for the new Java (script raises an error) so we have to comment them out.<\/p>\n\n\n
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We are done, but to make things nice and tidy and runnable from the GUI, we need to create a menu entry for our new AstrometryJ. For this, from Preferences -> Main Menu Editor<\/em>, we can add a new menu item under Education<\/em>.<\/p>\n\n\n
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The command line I entered in the image above is \/usr\/local\/AstroImageJ\/AstroImageJ<\/em>.<\/p>\n\n\n\n
Below you can see AstroImageJ running and displaying one of my fits files showing M42.<\/p>\n\n\n
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If you enjoyed this post consider following <\/strong>us on Facebook<\/a>, Youtube<\/a>, and Twitter <\/a>or donating <\/strong>on Patreon<\/a>. Also, stay tuned for public events<\/strong> Marc hosts regularly on Eventbrite<\/a>.<\/p>\n
Continue readingInstalling AstroImageJ on Astroberry Pi4<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":1114,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[9],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/starscape-experiences.space\/index.php\/wp-json\/wp\/v2\/posts\/1108"}],"collection":[{"href":"https:\/\/starscape-experiences.space\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/starscape-experiences.space\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/starscape-experiences.space\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/starscape-experiences.space\/index.php\/wp-json\/wp\/v2\/comments?post=1108"}],"version-history":[{"count":2,"href":"https:\/\/starscape-experiences.space\/index.php\/wp-json\/wp\/v2\/posts\/1108\/revisions"}],"predecessor-version":[{"id":1116,"href":"https:\/\/starscape-experiences.space\/index.php\/wp-json\/wp\/v2\/posts\/1108\/revisions\/1116"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/starscape-experiences.space\/index.php\/wp-json\/wp\/v2\/media\/1114"}],"wp:attachment":[{"href":"https:\/\/starscape-experiences.space\/index.php\/wp-json\/wp\/v2\/media?parent=1108"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starscape-experiences.space\/index.php\/wp-json\/wp\/v2\/categories?post=1108"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starscape-experiences.space\/index.php\/wp-json\/wp\/v2\/tags?post=1108"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}