The Sagittarius Dwarf Irregular Galaxy (SagDIG) (Giuseppe Donatiello)

The Sagittarius Dwarf Irregular Galaxy (SagDIG)

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

The Sagittarius Dwarf Irregular Galaxy (SagDIG)

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

The Sagittarius Dwarf Irregular Galaxy

Credit: ESO/VLT, NASA/ESA/HST, Giuseppe Donatiello

The Sagittarius Dwarf Irregular Galaxy (SagDIG orESO594-G004 ) is often confused with the near namesake Sagittarius Dwarf Elliptical Galaxy (SagDEG). What makes the difference, however, is not only the adjective "irregular" because they are two very different objects even though they belong to the same order.

SagDIG, is an autonomous (or isolated) dwarf placed at the boundaries of the Local Group at about 1.9 Mpc, rich in low metallicity stars of an average age. Membership of the Local Group is not ascertained.

SagDEG is instead one of the closest satellite galaxies of the Milky Way, but it would be preferable to say one of the ghosts since this dwarf is now completely destroyed and its remains move along orbits orthogonal to our spiral forming the Sagittarius Stream. A denser cloud of stars is placed in the direction of the galactic center where the globular cluster M54 perhaps represents its nucleus.

I composed these images intrigued by SagDIG after reading a paper with bad images, discovering that very few professional data are available on this object and not even of very high quality.

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 failed
Started	...
Astrometry.net job	3919834
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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The Sagittarius Dwarf Irregular Galaxy (SagDIG)

The Sagittarius Dwarf Irregular Galaxy (SagDIG)

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Image Index:

Contribution Index (beta):

The Sagittarius Dwarf Irregular Galaxy (SagDIG)

The Sagittarius Dwarf Irregular Galaxy (SagDIG)

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