The Great Orion Nebula (Pierre D.)

Celestial hemisphere: Southern · Constellation: Orion (Ori) · Contains: 41 Ori A) · 41 Ori C · 41 Ori D · 42 Ori) · 43 Ori) · 44 Ori) · Great Orion Nebula · Lower Sword · M 42 · M 43 · Mairan's Nebula · NGC 1973 · NGC 1975 · NGC 1976 · NGC 1977 · NGC 1980 · NGC 1982 · Orion Nebula · The star 45 Ori · The star Hatysa (ι Ori · The star Mizan Batil I (c Ori · The star Mizan Batil II (θ2 Ori · The star Trapezium (θ1 Ori A · The star θ1 Ori C · The star θ1 Ori D · the Running Man Nebula

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The Great Orion Nebula

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The Great Orion Nebula

Back to astrophotography after a long hiatus.

Acquisition details :

A remake of the Orion nebula using new equipment : a modified DSLR, dual narrowband filter (OIII, Ha), Bahtinov mask and most importantly... an auto-guiding module for longer exposures (phd2 on a raspberry pi 4, connected to a Bresser camera mounted on a 32/128mm mini scope).
To my knowledge the Bresser Deep-sky camera is the cheapest auto-guiding solution on the market, but it comes with a huge headache if you want to install the drivers and run the camera on a Unix distribution.

Auto-guiding with PHD2, in combination with manual dithering worked out really well (although it was not required to go beyond 40s due to the brightness of M42's core).

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Class 3 on Bortle scale. Location: Saizy, France.
Image taken during the exceptional 3 hours window of clear weather during the first week of January.
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Image description (see revision):

The Orion Bar is an impressive sight in the heart of the Great Orion Nebula. Studied by more than 70 peer-reviewed publications in the last 30 years only, it is recognized as the archetypal photodissociation region ("PDR"), i.e. a stratified region where cold, dense molecular gas transitions into irradiated, heated, ionized gas. A few massive stars located in the nearby Trapezium are at the origin of the strong UV radiation field, which carves a ridge into the molecular cloud, seen edge-on.

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Title: Orion Bar

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	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
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Star trails
Northern lights
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Landscape

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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	Basic success
Started	...
Astrometry.net job	9007494
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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The Great Orion Nebula

The Great Orion Nebula

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Acquisition details

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Image Index:

Contribution Index (beta):

The Great Orion Nebula

The Great Orion Nebula

Equipment

Acquisition details

Description

Comments

Revisions

E

Sky plot

Histogram

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