NGC 869-884 (Alberto Tomatis)

Celestial hemisphere: Northern · Constellation: Perseus (Per) · Contains: 7 Per) · NGC 869 · NGC 884 · The star Misam al Thurayya I (χ Per · chi Persei Cluster · h Persei Cluster

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NGC 869-884

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NGC 869-884

NGC 869-884 DOPPIO Ammasso

Costellazione Perseo

Il Doppio Ammasso è facilmente visibile ad occhio nudo nella costellazione di Perseo in un cielo scuro.

In un telescopio, si rivela la spettacolare bellezza di questi due ammassi aperti. Ogni ammasso contiene più di 100 stelle, le più brillanti in NGC 884 sono di magnitudine 8, le più brillanti in NGC 869, di circa 6,6.

La popolazione stellare di h e chi Persei:

La proprietà dell'ammasso, è il colore intrinseco e le temperature di stelle. Currie ne ha catalogate 47.000. Gli autori hanno scoperto che ci sono al minimo di circa 5.000 stelle in 10 minuti d'arco nel centro degli ammassi, con la regione generale che contiene circa 15.000 stelle. La distanza degli ammassi è di 7.500 anni luce (2300 parsec), e l'età di entrambi i gruppi da circa 14 milioni di anni.

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	Basic success
Started	...
Astrometry.net job	6416389
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC 869-884

NGC 869-884

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Image Index:

Contribution Index (beta):

NGC 869-884

NGC 869-884

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