M 28 (Alberto Tomatis)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: M 28 · NGC 6626

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M 28

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M 28

M28 si trova in un'area di cielo abbastanza ricca stelle appariscenti, molte delle quali riunite in un famoso asterismo chiamato la teiera; M28 si trova a meno di un grado a nord-ovest della stella λ Sagittarii, al punto che la sua luce può talvolta risultare fastidiosa. Sotto un cielo in buone condizioni meteorologiche è visibile anche con un binocolo 10x50, sebbene si mostri come un semplice punto biancastro molto debole e sfumato; la risoluzione in stelle inizia con telescopi da 150mm. Il bordo sud-orientale risulta meno ricco di stelle.

Il diametro lineare di M28, ottenuto rapportando la sua dimensione apparente con la sua distanza, si aggira sui 75 anni luce. In questo ammasso, distante più di 18.000 anni luce, sono state osservate 18 variabili del tipo RR Lyrae; nel 1987 M28 fu il secondo ammasso dove fu osservata una pulsar superveloce; il primo fu l'ammasso globulare M4. La sua velocità radiale è poco più di 1 km/s in recessione.

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	8235879
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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M 28

M 28

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Image Index:

Contribution Index (beta):

M 28

M 28

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Description

Comments

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