{"id":248,"date":"2016-02-16T15:19:17","date_gmt":"2016-02-16T21:19:17","guid":{"rendered":"http:\/\/13thstone.com\/blog\/?p=248"},"modified":"2016-02-16T15:24:18","modified_gmt":"2016-02-16T21:24:18","slug":"rosette-in-bicolor","status":"publish","type":"post","link":"https:\/\/13thstone.com\/blog\/?p=248","title":{"rendered":"Rosette in bicolor."},"content":{"rendered":"

Arg… it’s been a long time since I attempted to image, but <\/span><\/span>Dave<\/span><\/span><\/span> and I made it out last night for a few hours. We discussed attempting the Rosette Nebula since neither of us had ever tried to image that target before. It seemed to be up for a reasonable window and bright enough for us to get some data from the yellow-ish\/green zone at Tranquility Base. Dave continues to have camera control issues from his computer and I feel bad that I can’t be of more help due to my ignorance around the Nikon platform. He ended up shooting M81 and M82 unguided using a handheld intervalometer (off-body shutter trigger with an interval timer built in) and it worked quite well. I started out shooting with a hydrogen-alpha filter because the moon was quite bright. I think we are less than a week from it being full at this point. I didn’t think I’d have enough time to get sufficient RGB subs, so I had to make the call to either hoard a bunch more Ha data the rest of the imaging window or attempt a bi-color rendition of the target. I’m pretty new to narrowband integration and haven’t done much of anything using synthetic palettes other than perhaps the North American wide-field last year, so I switched to shooting Oxygen III until the nebula was obscured by Loblolly pine tree tops. I lost a handful of subs due to clouds and another handful of subs due to silly mistakes that I blame on a quarter year hiatus… like not meridian flipping before tracking fell off a cliff. At any rate, this image represents 46 sub-frames at 300s each (28 Ha and 18 OIII). I used a previous master suber-bias and master dark that I had in the library. I don’t know if the master dark temperature compensation was the same, but whatever (FWIW, this was shot at -5C). I wanted to process this in SHO Hubble Palette, but honestly couldn’t remember how to do it, so I just went with a natural synthetic green channel using a 10\/90 PixelMath blend of the Ha and OIII channels. The original Ha stack had far better signal to noise due to the greater number of subs and stronger Ha emission, so I used it for the Luminance rather than extracting Lum from the blended RGB. All of the registration, calibration, and integration was done in PI and then I just used PS CC for re-sizing for the web. This turned out to be a lot more interesting target than I anticipated and would really love to spend some time accumulating more (deeper) frames and try different processing techniques. Cheers!<\/span><\/span><\/span><\/p>\n

\"Rosette<\/a>
<\/span> Rosette Nebula<\/span><\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"

Arg… it’s been a long time since I attempted to image, but Dave and I made it out last night for a few hours. We discussed attempting the Rosette Nebula since neither of us had ever tried to image that target before. It seemed to be up for a reasonable window and bright enough for … Continue reading Rosette in bicolor.<\/span> →<\/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":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[1],"tags":[],"class_list":["post-248","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p4P0Vj-40","_links":{"self":[{"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/248","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=248"}],"version-history":[{"count":2,"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/248\/revisions"}],"predecessor-version":[{"id":251,"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/248\/revisions\/251"}],"wp:attachment":[{"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=248"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=248"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=248"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}