California Nebula in H-alpha for the Slow Observer (Mau_Bard)

California Nebula in H-alpha for the Slow Observer

This is the starless Ha channel of the complete HaRGB picture published here.

This is dedicated to the ones wanting to take some time to enjoy the boiling concavity and the edge filaments of the nebula that is ionized and blown away by Xi Persei. You can guess Xi position by the convergence of the normal lines to the surface.

I applied a very very light noise noise reduction and contrasting in order to leave the details intact.
A little noise in black and white photos produces a pencil-on-grainy-paper effect that I find enjoyable. But is a matter of taste, of course!

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Keywords: NGC1499 Sh2-220 California Nebula

Sharpless2 Objects
Starless Images
Only Monochromatic (Black and White!!!!! NO color, please!)
Light Polluted skies
Austria Astrophotography
Imaged with N.I.N.A.
N.I.N.A. Users
GHS Made a Substantial Difference
Imagers of Italy
Musical Imagers
Fine Art Astrophotography
Hydrogen and Oxygen Narrowband Only!
Suburban Astrophotography
PixInsight Addicts
Antlia ALP-T 5nm Dual Narrowband Filter
Cooled Color Cams

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 failed
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Astrometry.net job	8628556
PixInsight job	n/a
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PixInsight stage	n/a

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