Crab Nebula Supernova Remnant (M1) (Scott Denning)

Celestial hemisphere: Northern · Constellation: Taurus (Tau) · Contains: M 1 · NGC 1952

Crab Nebula Supernova Remnant (M1), Scott Denning

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Crab Nebula Supernova Remnant (M1)

Powered byPixInsight

Crab Nebula Supernova Remnant (M1)

Crab Nebula (M1, Supernova 1074 remnant) October-November 2019

Narrowband composite imaged at FL=1510 with ASI 1600 & ZWO filters on C8 EdgeHD @f7

Ha 64x300s ; O3 44x300s ; S2 52x300s for 13.3 hours total exposure

(Most subs with taken with a big moon in the sky!)

Followed Chris Foster’s excellent PixInsight processing workflow

Very aggressive subframe selection to reject poorly focused & tracked subs

Calibrated w/ master dark and master(flat minus flat-dark)

Cosmetic corrected

Subframe selected and weighted for focus, elongation, and SNR

Aligned

Integrated with linear fit rejection

MUREDenoise on each master in linear state

Deconvolution of each master in linear state

Linear fit O3 and S2 to Ha master

Color combined R=Ha ; Y=S2 ; B=O3 (very careful with weights!)

Actual color weights in PixelMath:

R = 0.5 * Ha + 0.5 * S2

G = 0.5 * S2 + 0.5 * O3

B = O3

Histogram stretch by hand

Gentle TGV Denoise of nonlinear image

Fairly aggressive MLT sharpening

Curves transformation and sat boost

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	4221140
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

Image Index:

Contribution Index (beta):

Crab Nebula Supernova Remnant (M1)

Crab Nebula Supernova Remnant (M1)

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Image Index:

Contribution Index (beta):

Crab Nebula Supernova Remnant (M1)

Crab Nebula Supernova Remnant (M1)

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

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