47 Tucanæ (Peter Hannah)

Celestial hemisphere: Southern · Constellation: Tucana (Tuc) · Contains: 47 Tuc Cluster · NGC 104

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47 Tucanæ

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47 Tucanæ

As I live in the northern hemisphere I cannot see 47 Tucanæ from home, but I was motivated to use a remote facility to image it following a trip to Chile, where I was able to observe 47 Tuc through the eyepiece of a 16″ Meade LX200 at the El Pangue observatory, not far from the town of Vicuña in central Chile. I do not recall the magnification used, but the view was stunning, the cluster almost filling the field of view.
For this image I used one of Telescope Live’s instruments, a 24″ Planewave CDK reflector located at their El Sauce observatory in the Rio Hurtado Valley, not far from El Pangue. I took just one sub of 10 minutes’ duration in each filter (red, green, blue and clear) to obtain the image.

47 Tucanæ is the second brightest globular cluster in the sky (the brightest being the Omega Centauri cluster, also a southern-hemisphere object though not so far south as 47 Tuc).

Globular clusters are enormous spherical conglomerations of stars, their shape being due to their self-gravity. They are found in a large halo surrounding our galaxy’s core, and have also been observed in other galaxies such as M31. The milky way has about 150 globulars in its halo and 47 Tuc is one of the largest, being about 120 light years across. It is about 13,000 light years distant and contains millions of stars. For a comparison of scale, the cluster as shown in this image is about the same size as the full Moon. In fact the cluster is even larger but an exposure long enough to reveal the outer regions would have resulted in the core being over-exposed.

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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.

Status	Basic success
Started	...
Astrometry.net job	8111317
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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