Sh2-135 (Alberto Tomatis)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep)

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Sh2-135

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Sh2-135

Sh2-135 è una nebulosa a emissione visibile nella costellazione di Cefeo.

Si individua nella parte meridionale della costellazione, poco a nord della linea che congiunge le stelle ζ Cephei e δ Cephei;

il periodo più indicato per la sua osservazione nel cielo serale ricade fra i mesi di luglio e dicembre ed è notevolmente facilitata

per osservatori posti nelle regioni dell'emisfero boreale terrestre, dove si presenta circumpolare fino alle regioni temperate calde.

Si tratta di una regione H II legata a una nebulosa oscura di polvere interstellare, che mostra un fronte di ionizzazione pronunciato

e in espansione; un modello che può spiegare bene la situazione è il cosiddetto blister model: secondo questo schema, il gas ionizzato

è spazzato via dal fronte di ionizzazione a seguito dell'interazione fra la regione H II e la nube molecolare adiacente.

La stella responsabile della ionizzazione dei gas è di classe spettrale O 9,5V.Stime sulla distanza iniziali hanno fornito un valore

di circa 1900 parsec (circa 6200 anni luce), mentre stile molto più recenti hanno dato valori decisamente superiori, nell'ordine

di 3100 parsec (circa 10100 anni luce). Numerose sorgenti di radiazione infrarossa sono state individuate attorno a questa nebulosa

dall'IRAS, indicando così la presenza di recenti processi di formazione stellare; gran parte di queste stelle sono raggruppate

in un giovano ammasso aperto, la cui stella dominante ha una massa di circa 7 M☉assieme a 174 oggetti stellari giovani identificati

con certezza e costituenti due addensamenti principali.

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	4226410
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Sh2-135

Sh2-135

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Image Index:

Contribution Index (beta):

Sh2-135

Sh2-135

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

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