Complesso Sh2-255 (Alberto Tomatis)

Celestial hemisphere: Northern · Constellation: Orion (Ori) · Contains: IC 2162

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Complesso Sh2-255

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Complesso Sh2-255

La regione di Sh2-254 è un complesso di regioni H II situato a 2460 parsec (circa 8000 anni luce)

di distanza dal sistema solare sul Braccio di Perseo, in corrispondenza della parte più meridionale

dell'associazione Gemini OB1, nella costellazione di Orione; poiché però la distanza di quest'associazione

OB non è nota con assoluta precisione, essendo variabile a seconda delle stime fra 1500 e 2000 parsec,

la reale interazione della regione con quest'associazione non è certa.

La regione è composta da alcune nubi che otticamente si presentano di aspetto sferoidale e apparentemente slegate fra di loro,

sebbene si trovino molto vicine l'un l'altra; le componenti più brillanti sono Sh2-255 e Sh2-257,

cui si aggiunge Sh2-254, la più estesa e da cui prende il nome il complesso, e altre nubi minori.

All'interno delle nubi della regione sono presenti dei fenomeni di formazione stellare,

come testimoniato dalla presenza di diverse sorgenti di radiazione infrarossa e alcuni maser

La regione nebulosa si osserva nella parte più settentrionale di Orione, in coincidenza del piano galattico,

immersa in ricchi campi stellari; la sua posizione è individuabile circa 6° a WNW rispetto alla brillante stella Alhena (γ Geminorum),

di magnitudine 1,9 e ben riconoscibile anche dalle aree urbane.

Le componenti più luminose sono Sh2-256, nota anche come IC 2162, e Sh2-255,

due nubi di forma sferoidale rivelabili con facilità in foto astronomiche a lunga posa riprese con ingrandimenti medio-alti.

Le regioni nebulose circostanti, come l'estesa Sh2-254, che costituisce l'estremità più occidentale del complesso,

appaiono molto più deboli e disperse, mentre le nubi minori, Sh2-257 e Sh2-258, sono di difficile individuazione.

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	3184684
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Complesso Sh2-255

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Complesso Sh2-255

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