NGC869 Double amas de persée (...et NGC884) (Lacheheb)

Celestial hemisphere: Northern · Constellation: Perseus (Per) · Contains: NGC 869 · NGC 884 · chi Persei Cluster · h Persei Cluster

NGC869 Double amas de persée (...et NGC884), Lacheheb

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NGC869 Double amas de persée (...et NGC884)

Link: https://1drv.ms/u/s!ApfteboMEzL6tBVvkGOijkOR-MLt?e=cprENk

Link to TIFF/FITS: https://1drv.ms/u/s!ApfteboMEzL6tBi5QMzLb8Y_-1cV?e=A6naxx

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

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NGC869 Double amas de persée (...et NGC884)

Link: https://1drv.ms/u/s!ApfteboMEzL6tBVvkGOijkOR-MLt?e=cprENk

Link to TIFF/FITS: https://1drv.ms/u/s!ApfteboMEzL6tBi5QMzLb8Y_-1cV?e=A6naxx

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

En astronomie, le double amas de Persée (ou simplement double amas) est le nom commun d'un ensemble d'amas ouverts visibles à l'œil nu, NGC 884 et NGC 869.

Leur proximité apparente n'est pas totalement fortuite. Âgés respectivement de 11 et de 12 millions d'années, ils sont nés du même nuage interstellaire. Le premier contient beaucoup de jeunes étoiles de type spectral B, autrement dit des géantes, alors que le second est fait essentiellement d'étoiles B blanches ou d'étoiles M rouges en phase de supergéantes. Compte tenu de leurs dimensions (autour de 100 années-lumière chacun), environ 200 années-lumière séparent réellement ces amas.

La lumière que nous recevons de ces deux amas est décalée vers le bleu. NGC 869 se rapproche en effet de la Terre à la vitesse de 39 km/s et NGC 884 à la vitesse de 45 km/s.

Source : Wikipedia

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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.
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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
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Astrometry.net job	5313699
PixInsight job	n/a
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NGC869 Double amas de persée (...et NGC884)

NGC869 Double amas de persée (...et NGC884)

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NGC869 Double amas de persée (...et NGC884)

NGC869 Double amas de persée (...et NGC884)

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