Belt and Sword (Sergio Díaz)

Celestial hemisphere: Southern · Constellation: Orion (Ori) · Contains: Flame Nebula · Great Orion Nebula · IC 426 · IC 430 · IC 431 · IC 432 · IC 434 · Lower Sword · M 42 · M 43 · Mairan's Nebula · NGC 1975 · NGC 1976 · NGC 1977 · NGC 1980 · NGC 1981 · NGC 1982 · NGC 2023 · NGC 2024 · NGC 2064 · Orion B · Orion Nebula · Part of the constellation Orion (Ori) · The star 31Ori · The star 42Ori · The star 49Ori · The star Alnilam (εOri) · The star Alnitak (ζOri) · The star Mintaka (δOri) · The star ιOri · And 4 more.

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Belt and Sword

Link: http://sergiodiaz.eu/#2019-02_Orion-Sergio_Diaz

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Belt and Sword

Link: http://sergiodiaz.eu/#2019-02_Orion-Sergio_Diaz

Orion's belt and sword widefield shot, imaged from light-polluted skies of Seville city (Andalusia, Spain), featuring the rich nebulosity in the area. Orange hues correspond to hydrogen and sulfur emission in infrared light, while bluish ones are related to oxygen emission in visible light.

In order to overcome the bright sky of a city and gain some contrast, we find ourselves forced to use narrowband filters. These filters select specific, less polluted colors, in which some atoms or molecules emit light. Processing is also fundamental to eliminate light pollution gradients and enhance the nebulosity. But nowadays, with the spread of white LEDs and their bright blue emission, even some of these filters won't help anymore. One of the exposures captured also a train of satellites beloging to a future megaconstellation.

We have to recover and protect our night sky.

Orientation: North is left.

Dates: {1-3, 25, 27}/02/2020

Optics: 135mm @ f/2.8

Ha: 45x300s, [OIII]: 24x300s, [SII]: 22x300s

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	Distinct awarded users	Total awarded images
Image of the day
Top picks
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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
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Star trails
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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
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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.

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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.
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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	3396712
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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