M57 (Alberto Tomatis)

Celestial hemisphere: Northern · Constellation: Lyra (Lyr) · Contains: IC 1296 · M 57 · NGC 6720 · Ring Nebula

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M57

M57 si osserva nella costellazione della Lira, a sud della brillantissima stella Vega; questa stella costituisce il vertice nord-est di un asterismo ben noto come

Triangolo Estivo. M57 si trova a circa il 40% della distanza angolare fra β Lyrae e γ Lyrae.

Piccoli telescopi possono individuarla facilmente se in condizioni adatte, mostrandola come un piccolo dischetto; con strumenti attorno i 10cm di diametro

la figura anulare e la forma ellissoidale cominciano a notarsi. Strumenti maggiori mostrano alcune zone oscure ad est e ad ovest dell'anello, più alcune aree

debolmente nebulose all'interno del disco.

La nebulosa si trova a circa 2300 anni luce dalla Terra. Possiede una magnitudine apparente di 8,8 e una magnitudine fotografica di 9,7.

In un periodo di 50 anni, il tasso di espansione è di circa 1 secondo d'arco • secolo-1, che corrisponde alle osservazioni spettroscopiche di 20–30 km-1.

M57 è illuminata da una nana bianca centrale di magnitudine 15,75 (variabile), la cui massa è circa 1,2 M☉.

Tutte le parti interne di questa nebulosa hanno una colorazione tendente al blu-verdastro, causata dall'ossigeno

doppiamente ionizzato (O2-) alla linea di emissione di 495,7 e 500,7 nm. Queste linee si riscontrano solo in condizioni di densità molto bassa,

equivalente ad appena pochi atomi per centimetro cubo. Nelle regiori più esterne dell'anello, parte della colorazione rossa è causata dalle linee di emissione

dell'idrogeno, a 656,3 nm, che forma parte della serie di Balmer di linee. Le linee dell'azoto ionizzato (N II) contribuiscono al colore rossastro a 654,8 e 658,3 nm.

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	6523078
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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M57

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Image Index:

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M57

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