NGC 157 (Cetus) (Alberto Tomatis)

Celestial hemisphere: Southern · Constellation: Cetus (Cet) · Contains: NGC 157

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NGC 157 (Cetus)

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NGC 157 (Cetus)

NGC 157 è una galassia nella costellazione della Balena.

Si presenta in un telescopio rifrattore come una macchia chiara posta 3,5 gradi ad est della stella ι Ceti. La grande luminosità del suo bulbo centrale non consente di notare facilmente la barra che caratterizza le spirali della sua classe, la quale classe risulta evidente anche nella forma dei suoi bracci. In particolare il braccio a sud è quello dalla forma più irregolare, che si apre verso l'esterno, forse a causa dell'interazione con un'altra galassia. Dista dalla Via Lattea 55 milioni di anni-luce.

Fu scoperta da William Herschel il 13 dicembre 1783, ed è una galassia isolata che non appartiene a nessun gruppo di galassie.

Ha un disco di idrogeno neutro un diametro di 500.000 anni luce, ha proprietà insolite come la velocità di rotazione del gas di idrogeno neutro che diminuisce di quasi tre volte in alcune aree, ma le ragioni di ciò non possono essere spiegate con certezza, poiché esistono solo ipotesi come collisioni con galassie con quasi la stessa massa di gas.

RC 16'' f/8
CCD: QHY268M
Montatura 1600GTO

Pose:Lum     71 pose da 60'' non guidate Bin 3x3
Red     30 pose da 60'' non guidate Bin 3x3
Green   15 pose da 60'' non guidate Bin 3x3
Blue   40 pose da 60'' non guidate Bin 3x3

Riprese in remoto da Alto-Observatory
Canino (VT)

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	8543104
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC 157 (Cetus)

NGC 157 (Cetus)

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NGC 157 (Cetus)

NGC 157 (Cetus)

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