{"id":291,"date":"2006-10-19T22:42:01","date_gmt":"2006-10-19T22:42:01","guid":{"rendered":"http:\/\/perezmedia.net\/beltofvenus\/2006\/10\/19\/double_star_ske_6\/"},"modified":"2006-10-19T22:42:01","modified_gmt":"2006-10-19T22:42:01","slug":"double_star_ske_6","status":"publish","type":"post","link":"https:\/\/perezmedia.net\/beltofvenus\/2006\/10\/19\/double_star_ske_6\/","title":{"rendered":"Double Star Sketch Update"},"content":{"rendered":"

I haven’t been able to get out for any observing recently. But I have<\/i> been up to something. In case you hadn’t noticed–and I know you have–I’m working on a double star project right now. In the process, I felt the need to come up with a consistent method for conveying stellar magnitudes. Something that goes a step further than the method I discussed in the double star tutorial<\/a> I put together a couple months ago. Since I’m already coloring the stars digitally I figured I would take care of magnitude differences digitally as well. Some astronomical sketchers may not care for this approach, since it does reduce and can even eliminate the hand-drawn appearance of the sketch. I can definitely appreciate that sentiment. I struggled with it quite a bit as I debated how to handle the magnitudes.
\nIn the end, I decided that there would be a lot of benefit to consistently comparing magnitudes across multiple sketches. Manipulating the sketches in Photoshop (or any other paint program) provides a very simple and reliable way of doing this. I worked out a list of paint brush sizes that I now use to plot the stars over the scanned sketch. I also apply a systematically larger glow around the brighter stars. I also set up a custom paintbrush to draw in diffraction rings for the magnified inset views of the closest doubles.
\nAfter using this process on my latest round of double star sketches, I went back and updated my older sketches. I still have the original sketches posted with each entry, but the double star sketch gallery<\/a> has been updated with all the new images.
\nI still need to figure out the best way to write a tutorial about this part of the process, since it’s pretty pedantic. But until then, here is a reference image of the brush sizes I use based on magnitude. (Note that I generate these sketches at a larger size and reduce them before posting here, so these brush dimensions appear larger in the original file.)
\n<\/p>\n","protected":false},"excerpt":{"rendered":"

Double Star Sketch Update<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[56,39],"tags":[],"class_list":["post-291","post","type-post","status-publish","format-standard","hentry","category-double-star","category-tools-and-techniques"],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":80,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/01\/16\/doublemultiple\/","url_meta":{"origin":291,"position":0},"title":"Lambda Orionis (Struve 738)","author":"jperez1690","date":"January 16, 2005","format":false,"excerpt":"Lambda Orionis","rel":"","context":"In "Double Star"","block_context":{"text":"Double Star","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/double-star\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":267,"url":"https:\/\/perezmedia.net\/beltofvenus\/2006\/08\/20\/ngc_1502_and_st\/","url_meta":{"origin":291,"position":1},"title":"NGC 1502 and Struve 485","author":"jperez1690","date":"August 20, 2006","format":false,"excerpt":"NGC 1502","rel":"","context":"In "Deep Sky"","block_context":{"text":"Deep Sky","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/deep-sky\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":81,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/01\/16\/doublemultiple_1\/","url_meta":{"origin":291,"position":2},"title":"Delta Orionis (Struve 14)","author":"jperez1690","date":"January 16, 2005","format":false,"excerpt":"Delta Orionis","rel":"","context":"In "Double Star"","block_context":{"text":"Double Star","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/double-star\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":88,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/01\/17\/doublemultiple_8\/","url_meta":{"origin":291,"position":3},"title":"Struve 747","author":"jperez1690","date":"January 17, 2005","format":false,"excerpt":"Struve 0747","rel":"","context":"In "Double Star"","block_context":{"text":"Double Star","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/double-star\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":282,"url":"https:\/\/perezmedia.net\/beltofvenus\/2006\/09\/04\/psi1_piscium_st\/","url_meta":{"origin":291,"position":4},"title":"Psi-1 Piscium (Struve 88)","author":"jperez1690","date":"September 4, 2006","format":false,"excerpt":"Psi-1 Piscium","rel":"","context":"In "Double Star"","block_context":{"text":"Double Star","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/double-star\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":151,"url":"https:\/\/perezmedia.net\/beltofvenus\/2005\/08\/14\/struve_331_alds\/","url_meta":{"origin":291,"position":5},"title":"Struve 331","author":"jperez1690","date":"August 14, 2005","format":false,"excerpt":"Struve 0331","rel":"","context":"In "Double Star"","block_context":{"text":"Double Star","link":"https:\/\/perezmedia.net\/beltofvenus\/category\/double-star\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/291","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/comments?post=291"}],"version-history":[{"count":0,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/posts\/291\/revisions"}],"wp:attachment":[{"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/media?parent=291"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/categories?post=291"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perezmedia.net\/beltofvenus\/wp-json\/wp\/v2\/tags?post=291"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}