Tulip Nebula, SH2-101 (Alastairmk)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg)

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Tulip Nebula, SH2-101

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Tulip Nebula, SH2-101

This Hubble palette image of the Tulip Nebula (Sh2-101) in Cygnus is based on data acquired in July and August under hot and humid conditions. Early attempts at processing this data did not meet my minimum standards so I tried again using some of the new Generalized Hyperbolic Stretch techniques I have recently learned. The final effort was still impervious to noise reduction with my Pixinsight skills so I gave it a final burst with Topaz DeNoise AI which vastly improved the image without loss of detail. The RGB stars were color calibrated using the new SpectrophotometricColorCalibaration process in Pixinsight using a Gaia database.

The image consists of 145 480s subframes (Ha:45, SII:50, OIII:50) for 19.33 hours of integration and 72x60s RGB (1.2h) subs to capture the stars. I followed my ruthless approach to rejecting subframes with high eccentricity, high FWHM, the worst light pollution gradients and weak transparency -- the last two steps with the NSG script. After screening out obvious defects like trees and clouds, the remaining 214 narrowband subs were pruned down to 145, with a loss of 9.2 hours of data. I have now tightened up the times of imaging objects to be closer to the zenith and improved tracking so that telescope productivity has improved, but with a backyard observatory, I find it better to attempt to image under marginal conditions and discard what doesn't work out.

NOVAC
Light Polluted skies

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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
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	Image of the day	Top pick	Top pick nominations	Total submitted
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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	6860604
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Tulip Nebula, SH2-101

Tulip Nebula, SH2-101

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Tulip Nebula, SH2-101

Tulip Nebula, SH2-101

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