The Great Orion Nebula (Ani Shastry)

Celestial hemisphere: Southern · Constellation: Orion (Ori) · Contains: 41 Ori A) · 41 Ori C · 41 Ori D · 41 the01 Ori · 42 Ori) · 42 c Ori · 43 Ori) · 43 the02 Ori · 44 Ori) · 44 iot Ori · 45 Ori · Great Orion Nebula · HD294262 · HD294263 · HD36593 · HD36606 · HD36655 · HD36742 · HD36782 · HD36843 · HD36866 · HD36884 · HD36899 · HD36917 · HD36918 · HD36919 · HD36938 · HD36939 · HD36958 · HD36960 · And 45 more.

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The Great Orion Nebula

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The Great Orion Nebula

Like a beautiful Lotus rising from the surface of the cosmic ocean, the Great Orion Nebula is a diffuse nebula situated in Orion’s belt and is one of the most iconic celestial structures across history. It is estimated to be approximately 1344 light years away from the Earth, and around 24 light years across. At the heart of the nebula lies the Trapezium Cluster, which are young but very massive and radiant stars that illuminate much of the surrounding nebula. I also managed to captured the Running Man Nebula in the same shot.

Capturing the Great Orion Nebula is both easy and difficult. Most of the outer structures are easy to capture as they are relatively bright. However it is extremely difficult to not wash out the core of the nebula. Instead of using singular timed exposures and hoping HDR MultiScale Transform would somehow bring back detail, I chose to expose at 30s, 60s, 120s and 300s for R, G and B, along with 600s for H-alpha with just over 11 hours in total. Stacking, processing and compositing all of this was quite painful, but I think the end result speaks for itself — being able to see the all of the detail across the entire nebula. The subs themselves were captured using a Dreamscope 16” Newtonian Astropgraph at f/3.75 and an FLI PL16803 camera.

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Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	8863977
PixInsight job	K5XEMHBBX4SEFXENTJDD644NSNCN93TE
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h35m01s.64
RA (top/left)	05h32m34s.95
RA (top/right)	05h37m54s.15
RA (bottom/right)	05h37m29s.40
RA (bottom/left)	05h32m09s.82

Dec (center)	-05°18′57″.7
Dec (top/left)	-06°03′12″.9
Dec (top/right)	-05°57′04″.10
Dec (bottom/right)	-04°34′48″.6
Dec (bottom/left)	-04°40′45″.2

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