NGC 2440 (Alberto Tomatis)

Celestial hemisphere: Southern · Constellation: Volans (Vol) · Contains: NGC 2434 · NGC 2442

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NGC 2440

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NGC 2440

NGC 2440 è una nebulosa planetaria visibile nella costellazione della Poppa.

La nebulosa fu scoperta nel 1790 da William Herschel; si individua con facilità, poiché si trova circa 4 gradi a sud dell'ammasso aperto M47. Nonostante le sue piccole dimensioni, può essere scorta anche con un piccolo telescopio. La stella centrale della nebulosa, la nana bianca, ha magnitudine 14,3.

Caratteristica peculiare della stella al centro di questa nebulosa è l'elevatissima temperatura superficiale di 200.000 kelvin.

Il disco e spirale di NGC 2442 ha un arco circa 150.000 anni luce. La struttura asimmetrica di NGC 2442 e' dovuta probabilmente il risultato di una precedente interazione mareale con una galassia che non si vede nell'immagine. Il braccio settentrionale che sembra essere piegato su se stesso sta producendo regioni di formazione stellare probabilmente innescato da interazione gravitazionale con un'altra struttura massiccia. Ryder et al. (APJ 2001) ha identificato una vicina nube di gas intergalattico che contiene quasi 1/3 della quantità di idrogeno atomico come NGC 2442 stesso. Si ritiene che la nube contiene la massa di un miliardo di soli . NGC 2442 ha un bar centrale pronunciato e il braccio meridionale ha una particolare forma "gancio", questo è il motivo per cui alcuni si riferiscono ad essa come la galassia "Meathook".

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
Artificial satellite

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

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