NGC 7293 (Alberto Tomatis)

Celestial hemisphere: Southern · Constellation: Aquarius (Aqr) · Contains: Helix Nebula · NGC 7293

NGC 7293

La Helix nebula NGC 7293,è una delle nebulose planetarie più vicine alla Terra.

Si trova a 200 parsec o 650 anni luce dalla Terra nella costellazione dell'Aquario e ha un diametro angolare di circa 0.5°.

È stata scoperta da Karl Ludwig Harding prima del 1824.

Ha un aspetto molto simile alla nebulosa Anello. È anche simile per dimensione, età e caratteristiche fisiche alla nebulosa M 27;

le significative differenze nell'aspetto sono conseguenza della relativa vicinanza e del diverso angolo da cui la vediamo.

La Helix nebula viene spesso chiamata l'Occhio di Dio, a partire almeno dal 2003.

E' un esempio di una nebulosa planetaria formatasi alla fine della vita di una stella di tipo solare.

Gli strati gassosi esterni della stella espulsi nello spazio appaiono dal nostro punto di vista come se guardassimo dall'alto un'elica.

Il nucleo centrale della stella, destinato a diventare una nana bianca, risplende così intensamente da rendere fluorescente il gas precedentemente espulso.

La Helix nebula ha una dimensione di circa 2,5 anni luce.

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	6662814
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC 7293

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