NGC891 ou Caldwell 23 (Lacheheb)

Celestial hemisphere: Northern · Constellation: Andromeda (And) · Contains: NGC 891

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NGC891 ou Caldwell 23

Link: https://1drv.ms/u/s!ApfteboMEzL6tA8-QGsA0HPauGPT?e=GRPCLa

Link to TIFF/FITS: https://1drv.ms/u/s!ApfteboMEzL6tBCAbX-j7VAiim5w?e=shMb7k

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

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NGC891 ou Caldwell 23

Link: https://1drv.ms/u/s!ApfteboMEzL6tA8-QGsA0HPauGPT?e=GRPCLa

Link to TIFF/FITS: https://1drv.ms/u/s!ApfteboMEzL6tBCAbX-j7VAiim5w?e=shMb7k

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

NGC 891 ou Caldwell 23 est une galaxie spirale vue par la tranche et située dans la constellation d'Andromède. Elle a été découverte par l'astronome germano-britannique William Herschel en 1784.

La classe de luminosité de NGC 891 est II et elle présente une large raie HI. Elle renferme également des régions d'hydrogène ionisé. C'est aussi une galaxie active qui présente un jet d'onde radio.

NGC 891 est le prototype même des galaxies vues par la tranche, et le plan médian est ici traversé par une épaisse bande de poussière qui semble fendre la galaxie en deux parties symétriques. Malgré une magnitude apparente de 10,1, la faible luminosité surfacique de cette galaxie, due au masquage du noyau galactique par la bande d'absorption, la rend relativement difficile à observer. Elle se trouve, par effet de perspective, à proximité immédiate de l'amas de galaxies Abell 347 mais n'en fait pas partie, cet amas se situant à plus de 250 millions d'années-lumière de notre Galaxie.

Source : Wikipedia

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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
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Northern lights
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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
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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	5311842
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC891 ou Caldwell 23

NGC891 ou Caldwell 23

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NGC891 ou Caldwell 23

NGC891 ou Caldwell 23

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