Region um Sadir und Deneb im Sternbild Schwan (Hans-Peter Olschewski)

Region um Sadir und Deneb im Sternbild Schwan

Deneb ist der hellste Stern (α Cygni) im Sternbild Schwan. Er bildet zusammen mit Wega und Altair das Sommerdreieck. Mit einer scheinbaren Helligkeit von 1,2 mag ist Deneb ist der 19.-hellste Stern am Nachthimmel und zusammen mit Eta Carinae der hellste bislang bekannte Stern in unserer Milchstraße im sichtbaren Licht. Seine Entfernung beträgt etwa 3.200 Lichtjahre.

Sadir (Gamma Cygni) ist ein Stern im Sternbild Schwan. Der Stern ist auch unter seinem Eigennamen Sadr bekannt und hat eine scheinbare Helligkeit von 2,2 mag. Seine Entfernung beträgt ca. 1.500 Lichtjahre.

Deneb (α Cygni) is the brightest star in the constellation of Cygnus and one of the vertices of the Summer Triangle. It is the 19th brightest star in the night sky, with an apparent magnitude of 1.25, a blue white supergiant. Deneb is also one of the most luminous nearby stars. However, its exact distance (and hence luminosity) has been difficult to calculate, so it is somewhere between 55.000 and 196.000 times as luminous as the Sun. The distance is about 3.200 light years.

Sadir (γ Cygni) is the Bayer designation for a star in the northern constellation Cygnus, forming the intersection of an asterism of five stars called the Northern Cross. It has the traditional name Sadr. Compared to the Sun this is an enormous star, with 12 times the Sun's mass and about 150 times the Sun's radius. The distance is about 1.500 light years.

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.

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