Into the core of NGC6357 (Andrew Klinger)

Celestial hemisphere: Southern · Constellation: Scorpius (Sco) · Contains: NGC 6357

Into the core of NGC6357, Andrew Klinger

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Into the core of NGC6357

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Into the core of NGC6357

Using my NGC6357 data from May 2019, I heavily cropped and re-processed the core region. This chaotic scene in space holds home to some of the most massive stars, who's stellar winds shape and excite the dust around them to form these intricate glowing nebula.

In this false-color narrowband image, I display the sulfur and hydrogen signal as the warm tones, and oxygen as blue.

Equipment:

OTA: William Optics GT81 w/0.8x reducer (382mm fl at f/4.7)

74mm aperture stop-down ring (brings scope to f/5.2)

Mount: Orion Sirius EQ-G (HEQ-5)

Guidescope: Orion 50mm guidescope

Guiding camera: Orion StarShoot Autoguider

Imaging camera: ZWO ASI1600MM-Cool

Accessories:

QHYCCD PoleMaster

Software:

SGP

PHD2

CdC

PixInsight

Starnet++

Acquisition:

Location: Atoka, OK (Bortle 3)

Dates: 5/31/19, 6/26/19, 6/27/19

Gain: 200 Offset: 50

Camera temp: -10C

Sii: 34x300" Astrodon 3nm

Ha: 35x300" Astrodon 5nm

Oiii: 33x300" Astrodon 3nm

Total integration time: 8hr 30min

64x darks per calibration (master from library)

30x flats per calibration

200x bias per calibration (master from library)

See my previous widefield posting of NGC6357 for processing workflow. The workflow was very similar except all channels were Drizzled 2x for better resolution of the core area.

Narrowband imaging

Please note: The following tables are updated every 24 hours.

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	Basic success
Started	...
Astrometry.net job	2990496
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Contribution Index (beta):

Into the core of NGC6357

Into the core of NGC6357

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Image Index:

Contribution Index (beta):

Into the core of NGC6357

Into the core of NGC6357

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

In these public groups

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