NGC 6894 (Diego Barucco)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: NGC 6894

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NGC 6894

Link: http://pnebulae.altervista.org/catalogo/ngc/6894/immagini/02_img-bar02.html

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NGC 6894

Link: http://pnebulae.altervista.org/catalogo/ngc/6894/immagini/02_img-bar02.html

NGC 6894 è una planetaria poco studiata e poco frequentata dagli astronomi e astrofili. Le sue discrete dimensioni e la facilità con la quale visualmente mostra il suo aspetto anulare rendono questo oggetto molto appetibile con telescopi di medio-piccolo diametro a condizione che l'osservazione venga condotta sotto cieli bui. La luminosità superficiale non è alta per cui è necessaria una certa concentrazione per apprezzarne l'anello molto regolare ed uniforme. Con telescopi di più largo diametro è possibile tentare l'individuazione di variazioni di luminosità interne all'anello.

A causa delle poche ricerche condotte su questo oggetto è difficile avere un'idea chiara della sua dinamica e morfologia. Dalla visione d'immagini ad alta risoluzione sembra trattarsi di una nebulosa a doppio guscio con struttura generale ad ellissoide. L'anello che noi facilmente vediamo in visuale e in fotografia è il guscio più interno e più eccitato che sovrasta un guscio poco più ampio e debole probabilmente emesso durante la fase di supervento della stella progenitrice.

In immagini a colori in tricromia questa nebulosa appare colorata con lievi variazioni che fanno presupporre una stratificazione della ionizzazione; naturalmente con questo si vuole invitare a tentare riprese in tricromia interferenziale onde poter effettuare valutazioni più precise.

Original
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B

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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	4058872
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC 6894

NGC 6894

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NGC 6894

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