Galaxie d'Andromède (M31) (Serge Golovanow)

Galaxie d'Andromède (M31)

M31 est une des galaxies les plus proches de la notre : environs 2,5 millions d'années lumière.

Elle a été observée en 905 par un astronome persan qui l'a décrite comme un "petit nuage", sa première description à l'aide d'un télescope est réalisée en 1612. En 1887 la première photographie qui en est faite révèle sa forme en spirale, mais il faut attendre 1925 pour qu'Edwin Hubble détermine sa distance et sa nature : on pensait jusqu'alors qu'il s'agissait d'une nébuleuse, bien plus proche de nous.

Elle se rapproche de nous à 300 km/seconde, ce qui pourrait entraîner une fusion avec notre galaxie dans quelques milliards d'années.

On distingue deux de ses galaxies satellites : M32 en haut (découverte en 1749), M110 en bas (découverte par Messier en 1773)

2h30 (25x6min) de pose, Canon EOS40D ISO800 sur une TMB80 (384mm f4.8).

Autoguidage (étoile : 32And) avec PL1-M sur Celestron C11 (2800mm f10) + GuideMaster. Monture Losmandy Titan.

Traitements avec DeepSkyStacker (11 darks, 21 flats, 21 offsets), Photoshop et NeatImage.

Nuit du 19 au 20 août, à l'observatoire du CALA.

Free for non-commercial use, please [url=http://www.sendell.com/contact/ rel=]notify me[/url] of every use !

Libre pour une utilisation non commerciale, merci de me notifier de son utilisation

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	n/a
Started	n/a
Astrometry.net job	n/a
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

Image Index:

Contribution Index (beta):