NGC 6765 (Diego Barucco)

Celestial hemisphere: Northern · Constellation: Lyra (Lyr) · Contains: NGC 6765

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NGC 6765

Link: http://pnebulae.altervista.org/catalogo/ngc/6765/immagini/04_img-bar03.html

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NGC 6765

Link: http://pnebulae.altervista.org/catalogo/ngc/6765/immagini/04_img-bar03.html

NGC 6765 è il classico caso di planetaria dimenticata. Ben pochi conoscono questo oggetto collocato nella costellazioni della Lira, molto probabilmente perchè parlando di nebulose planetarie nella Lira viene in mente principalmente M57. Oltre ad essere dimenticata dagli astrofili questa planetaria è stata pochissimo studiata dagli astronomi se si escludono solo due lavori, uno degl'anni ottanta ed un altro molto recente. Al telescopio è un oggetto piuttosto debole ma alla portata di un telescopio di 20 cm con i quali si mette bene in evidenza una zona ad alta luminosità. Caso molto strano, l'osservazione visuale è molto ingannevole ed è comune l'errore di considerare questa nebulosa come anulare; al telescopio, infatti, si ha l'impressione di percepire un debole anello con una zona altamente luminosa, tale inganno è possibile subirlo anche con telescopi di largo diametro. In realtà si tratta di una nebulosa planetaria bipolare toroidale vista di taglio dove la zona luminosa altro non è che il toroide. Lungo l'asse perpendicolare del toroide s'intravedono due condensazioni (ansae) che esprimono la presenza di un possibile getto polare. Una di queste ansae è alla portata di telescopi di piccolo diametro tanto che il vuoto che la separa con il toroide centrale è responsabile dell'illusione della forma ad anello.

In immagini professionali è possibile individuare esternamente una struttura ad arco a basso livello di ionizzazione che potrebbe rappresentare le vestigia di un lobo polare, oltre ciò tali immagini non sono ancora sufficientemente dettagliate per poter fornire informazioni più precise.

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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	4058930
PixInsight job	n/a
PixInsight queue size	n/a
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NGC 6765

NGC 6765

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NGC 6765

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