NGC 1491 (Alberto Tomatis)

Celestial hemisphere: Northern · Constellation: Perseus (Per) · Contains: NGC 1491

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NGC 1491

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NGC 1491

La nebulosa NGC 1491 si individua nella parte settentrionale della costellazione, al confine con la Giraffa;
è possibile localizzarla con facilità, trovandosi a circa 2° in direzione NNW dalla stella λ Persei,
una subgigante bianca di magnitudine 4,25 ben visibile ad occhio nudo. Può essere individuata anche con
un telescopio amatoriale di media potenza, meglio con l'ausilio di filtri.

NGC 1491 è stata scoperta da William Herschel nel 1790.

L'immagine è stata generata con osservazioni nei filtri Ha RGB

NGC 1491 è una regione H II situata sul bordo di una vasta regione occupata da nubi di gas neutro;
la fonte della ionizzazione dei suoi gas proviene dal vento stellare della stella BD+50° 886,
una stella blu di classe spettrale O5, di magnitudine 11,22 e dall’elevata temperatura superficiale.
Strutturalmente si tratta di una nube evoluta, una delle poche conosciute ad essere ionizzate da una
stella di classe O5, facente parte del Braccio di Perseo,presenta una struttura ad anello aperto, una sorta di bolla aperta sul lato orientale, il cui spessore è
compreso fra 0,05 e 0,1 parsec. la struttura è causata
dall’azione dell’onda d’urto della materia espulsa dalla stella relativamente recente.
La densità del gas diminuisce con la distanza da questa struttura ad anello aperto.

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	5580358
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC 1491

NGC 1491

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Image Index:

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NGC 1491

NGC 1491

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