NGC 300 The Southern Pinwheel in RGB with Spectrophotometric Colour Calibration and the Search for Colour Truth. (Ian Parr)

Celestial hemisphere: Southern · Constellation: Sculptor (Scl) · Contains: NGC 300

NGC 300 The Southern Pinwheel in RGB with Spectrophotometric Colour Calibration and the Search for Colour Truth., Ian Parr

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NGC 300 The Southern Pinwheel in RGB with Spectrophotometric Colour Calibration and the Search for Colour Truth.

Powered byPixInsight

NGC 300 The Southern Pinwheel in RGB with Spectrophotometric Colour Calibration and the Search for Colour Truth.

NGC 300 (also known as Caldwell 70) is a spiral galaxy in the constellation Sculptor. It is one of the closest galaxies to the Local Group, and probably lies between the latter and the Sculptor Group. It is one of the brightest of the five main spirals in the direction of the Sculptor Group, including NGc55 (The String of Pearls) and NGC 253,The Sculptor Galaxy, and NGC 247, The Needles Eye Galaxy. It has an Apparent magnitude of 8.13 and Apparent size 21′.9 × 15′.5 and it is about 94,000 light years away.

I revisited the same October data as before but with the new Spectrophotometric Colour Calibration tool in Pixinsight ** applied to the Linear Data before stretching with Generalised Hyperbolic Stretch. StarXterminator is used to the separate the galaxy and the stars. A very basic range mask is used on the starless and another starless extract on the Stars to support Star Reduction in PixelMath using Bill Blanshan's truly great script. Then re-combined in Pixel Math and finally some a gentle noise reduction with Russell Croman's NoiseXterminator. All this seems to preserve detail, especially in the background galaxies and a more even background overall and completely avoids problematic colour masking.

The latest Pixinsight and the 3rd Party support tools have really come a long way in the last year.

** See Adam Blocks new YouTube videos on using SPCC and astrometry.

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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	Basic success
Started	...
Astrometry.net job	6679790
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

Image Index:

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NGC 300 The Southern Pinwheel in RGB with Spectrophotometric Colour Calibration and the Search for Colour Truth.

NGC 300 The Southern Pinwheel in RGB with Spectrophotometric Colour Calibration and the Search for Colour Truth.

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Image Index:

Contribution Index (beta):

NGC 300 The Southern Pinwheel in RGB with Spectrophotometric Colour Calibration and the Search for Colour Truth.

NGC 300 The Southern Pinwheel in RGB with Spectrophotometric Colour Calibration and the Search for Colour Truth.

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