A Wolf-Rayet Double Pack (Christian Koll)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: 27 Cyg · 28 Cyg · Crescent Nebula · NGC 6883 · NGC 6888 · The star b1 Cyg · The star b2 Cyg

A Wolf-Rayet Double Pack, Christian Koll

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A Wolf-Rayet Double Pack

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A Wolf-Rayet Double Pack

Wolf-Rayet stars are a separate group of super massive O type stars with a mass in excess of 25 solar masses.
During their Wolf-Rayet phase, which lasts 200,000 to 500,000 years, they blast away their entire outer hydrogen shell, exposing their helium fusion core.
This is why these stars show an intense helium emission line with the absence of almost any hydrogen emission. Further on the path to their final end in a supernova, they continue to repel the layers of their stellar core, creating unique nebulae.

Shown in the left half of this picture is the Crescent Nebula NGC 6888 with its star WR136 in the center.
WR134 and its peculiar nebula are shown to the very right.
At the lower edge of the frame the Soap Bubble nebula - a planetary nebula discovered by an amateur astronomer in 2007 - can be seen.

Original
Final
D

Narrowband imaging
The refractors!
CMOS Imagers
Fine Art Astrophotography
QHY Users Group
Austria Astrophotography
Imaged with N.I.N.A.
QHYCCD 600M
Skywatcher Esprit ED Super APO Triplet

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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	8997889
PixInsight job	n/a
PixInsight queue size	n/a
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A Wolf-Rayet Double Pack

A Wolf-Rayet Double Pack

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A Wolf-Rayet Double Pack

A Wolf-Rayet Double Pack

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