NGC 6397 The Blue Straggler in Ara (Ian Parr)

Celestial hemisphere: Southern · Constellation: Ara (Ara) · Contains: NGC 6397

NGC 6397 The Blue Straggler in Ara, Ian Parr

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NGC 6397 The Blue Straggler in Ara

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NGC 6397 The Blue Straggler in Ara

NGC 6397 a globular cluster in the constellation Ara is one of the two nearest globular clusters to Earth at about 7,800 light-years. The other is M4.
It's evolutionary age (based on evolutionary models) is about 13,400,000 years (+- 800 million years).The cluster contains around 400,000 stars and is one of at least 20 globular clusters of the Milky Way Galaxy that have undergone a core collapse into a very dense stellar agglomeration.

7 Jan 2024 Update

Rubbish weather and idle hands so fully reprocessed with the latest GHS, BluxXTerminator V 4.
I was kept the best 4.5 out of 5.8 hours in Subframe Selector, based on FWHM, Eccentricity and Star count.
I apply BX Correction to cropped RGB frames, then for RGB combined I use GraxPert for background extraction and SPCC for color correction before very gentle BlurXTerminator.
Conversion to Non-Linear using GHS to adjust linear black point before initial color stretching and general stretching. Once in Non-Linear I use a lightness mask generated with ACDNR and use that to reduce background, invert mask and then boost saturation for the stars. Compared to the original , a bit of a difference :-).

Original
Final
B

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	9009202
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC 6397 The Blue Straggler in Ara

NGC 6397 The Blue Straggler in Ara

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Image Index:

Contribution Index (beta):

NGC 6397 The Blue Straggler in Ara

NGC 6397 The Blue Straggler in Ara

Equipment

Acquisition details

Description

Comments

Revisions

Sky plot

Histogram

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