NGC5139 Omega Centauri (Carl Tanner)

Celestial hemisphere: Southern · Constellation: Centaurus (Cen) · Contains: NGC 5139 · omega Cen

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NGC5139 Omega Centauri

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NGC5139 Omega Centauri

Our Galaxy's largest globular cluster, Omega Centauri (ngc5139). Although, technically speaking, it's most likely not a true globular cluster, but the core region of a galaxy, smaller than our own, that once orbited our Galaxy but was shredded down to its present size by our Galaxy's gravitational forces. Lying some 15800ly away, Omega weighs in at around 5 million solar masses, contains approx' 10 million stars and is around 192ly in diameter. It's the 2nd largest cluster in the Local Group, after G1 which orbits M31. Omega is easily visible to the naked eye, even from moderately light polluted town skies, as a bright, hazy patch, with an integrated magnitude of around 3.9. The stars of the cluster form several discrete groups of different metallicities, which is one of the indicators that it is not a true globular cluster, whose stars all form concurrently with one another. It's oldest stars are around 12 billion years old. The cluster was first observed in 150AD, by the Greco-Roman philosopher and astronomer, Ptolemy, who noted it in his "Almagest" as a "star riding on a horse's back.". Pic was taken on t68 at the Bathurst Observatory (BAT), iTelescope Network. 5x60sec subs.

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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.

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NGC5139 Omega Centauri

NGC5139 Omega Centauri

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NGC5139 Omega Centauri

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