سديم الزهيرة The Rosette Nebula .
اسم السديم التصنيفي هو NGC 2237. يحتوي السديم في داخله عنقودا نجميا مفتوحا من النجوم اللامعة الفتية. تشكلت هذه النجوم قبل حوالي أربع ملايين سنة من المواد المشكلة للسديم ذاته، بينما تقوم رياحها النجمية بخلق فراغ في مركز السديم، معزول بطبقة من الغبار والغاز الحار. تعمل الأشعة فوق البنفسجية للنجوم الفتية على توهج السديم بألوان مختلفة. يمتد سديم الزهيرة على حوالي 100 سنة ضوئية، ويبعد حوالي 5000 سنة ضوئية، ويمكن رصده باستعمال تلسكوب صغير باتجاه كوكبة وحيد القرن.
LAAS member, Blake Estes, went out to Joshua Tree to watch the meteor shower with his friend @samdschmitt and not only did they see the best meteor shower of the year, but they collaborated on some imaging of deep sky objects. Here is the Rosette Nebula, taken with an Orion Atlas EQ-G and a Orion EON 80ED with a 0.8x reducer. Camera was an self modified Canon 40D. Exposures were 6x10 minute exposures at ISO 800 autoguided.
The Rosette Nebula. Within a giant molecular cloud this beauty exists. And within this swirl matter infant stars are forming from the matter of the Nebula. From the chaos of the universe, order forms. This past year has been that for me. 2018 is gonna be interesting as I’m going to be leading some workshops for night and daytime shooting in the Lake Tahoe Area. Also, I’m now working with a photography gallery The Stevenson Gallery in Lake Tahoe where some of my work is available for purchase. Thanks for following along as I’m working in a new direction.
The Rosette nebula is a large circular emission nebula in the constellation Monoceros. It surrounds a cluster of hot, young stars known as the rosette cluster. This is a bi colour image taken using Ha and Oiii filters. #rosettenebula#space#astrophotography#astronomy
1 1395:22 PM Dec 24, 2017
I reworked rosette nebula with additional broadband data.
5min x 11 L
5min x 15 R
5min x 16 G
5min x15 B
10min x 15 Ha
Except for Ha, I put Orion’s skyglow astrography filter to cut down light pollution.
In this hobby, I always struggle in a dilemma between shooting many different objects and collecting more lights from a specific target. As my main observing location is sub optional in many ways, I have to be patient.
With the big 6" refractor... It never gets used. Dunno why..its less of a pain than the 10" celestron reflector ...anyways...here's the 3rd attempt at the rosette nebula...I absolutely hate the color red...long story ...5.25 total exposure time in rgb and ha...ha time was less than an hour more or less with the canon 40da. #canon40da#rosettenebula#astrophotography#asgtmount#moddedasgt#DSO
Rosette Nebula in SOH. Emission nebula in Monoceros. Appx. 5,000 light years from earth. 36.5 hours integration time. 1800 sec. exposures. FSQ-106EDXIII. Astro Physics 1100GTO AE-L. SBIG STL-11000. Captured with Sequence Generator Pro. Calibrated, aligned and stacked in Deep Sky Stacker. Processed in PS CC 2018. #rosettenebula#astrophotography#sbig#fsq106#astronomy#okcastronomyclub
2 2811:18 PM Dec 16, 2017
Went out to Joshua Tree to watch the meteor shower with my friend @samdschmitt and we not only saw the best meteor shower of the year, but we collaborated on some imaging of deep sky objects. We got some amazing shots! Here is The Rosette Nebula, taken with an Orion Atlas EQ-G and a Orion EON 80ED with a 0.8x reducer. Camera was an self modified Canon 40D. Exposures were 6x10 minute exposures at ISO 800 autoguided.
The Rosette Nebula’s striking #red color can’t be seen by the naked eye & must be captured photographically. #Follow@outerplaces for space, science, & a little bit of science fiction. #outerplaces
4 5910:27 PM Dec 12, 2017
Orion Molecular Cloud Complex
Tis the season for photographing Orion! This time of year we get a good view of Orion, and with the dry winter air the skies are crystal clear. This is a photo of the Orion Molecular Cloud Complex, which is a large group of bright nebulae, dark clouds, and young stars visible around the Orion constellation. Some of the most noticeable objects in this image include the Angelfish Nebula, Barnard’s Loop, Orion Nebula, Flame Nebula, Horsehead Nebula, Rosette Nebula, and the bright colorful stars Betelgeuse, Rigel, Bellatrix, and Saiph, to name a few.
This was shot with the Nikon D810A, Sigma 50mm f1.4 Art lens, and some new gear on loan from SLIK. This image is a composite of 20 images shot at 60 seconds each, f/2.8, and ISO 800. I used f/2.8 to sharpen up the stars and reduce distortion that was present at wider f-stops. I also took 20 dark frames, each at the same settings as the “light frames” (the regular exposures) but with the lens cap on. I then loaded all the images in Starry Landscape Stacker (Mac only but you can do the same thing in many other programs including Photoshop). The goal of shooting many frames is to align, stack, and average them to produce a shot with pinpoint stars and low noise. The star tracker was able to track the sky so that I could do 60 second (and probably much longer) exposures at 50mm. The dark frames are used by Starry Landscape Stacker (and many other programs such as Deep Sky Stacker) to find and remove sensor pattern noise and hot pixels.
I then used the LRGB processing technique that is commonly used for space images, and the technique is presented in a great tutorial by Lonely Speck. Other than the Orion nebula and the stars, the other nebulae are very dim and bringing them out in processing requires a bit of work and the LRGB technique lets you bring out the details and the colors separately and with a lot of fine tuned control.