Sh2-239 (Alberto Tomatis)

Celestial hemisphere: Northern · Constellation: Taurus (Tau)

Sh2-239

Sh2-239 è una nebulosa a emissione visibile nella costellazione del Toro.

L'individuazione della sua posizione è semplice, nella parte centrale della costellazione,

circa a metà strada fra la brillante Aldebaran (a Tauri) e e Tauri, in direzione dell'ammasso aperto delle Iadi.

Inizialmente si è pensato che questa potesse essere una nebulosa a riflessione, una parte illuminata della nebulosa oscura

LDN 1551; in seguito fu riconosciuta come nube di gas ionizzato, appartenente alla classe degli oggetti HH,

catalogata come HH 102. La distanza dell'oggetto è stimata sui 139 parsec (453 anni luce) e viene a trovarsi di fronte

al complesso della Nube del Toro, una delle regioni di formazione stellare di stelle di piccola massa più vicine al sistema

solare; sebbene appaia apparentemente associata alle Iadi, i due oggetti non sono fisicamente legati, dato che le Iadi

si trovano in primo piano, ad appena 151 anni luce dal Sole.

La nebulosa è associata alla nube oscura LDN 1551, una delle regioni di formazione di stelle di piccola massa più vicine;

possiede una massa di circa 40 masse solari e al suo interno si trovano una dozzina di stelle di pre-sequenza principale,

alcune delle quali possiedono dei getti che riversano materia nel mezzo interstellare circostante. Nella nube sono state

scoperte alcune sorgenti di radiazione infrarossa, la più brillante delle quali è nota come L1551 IRS 5; questa sorgente

ha una luminosità di circa 40 luminosità solari, si trova in profondità all'interno della nube e corrisponderebbe a una

proto-stella binaria, le cui componenti sono separate da circa 40 UA.

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	6715357
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Contribution Index (beta):

Sh2-239

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Image Index:

Contribution Index (beta):

Sh2-239

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

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