File:Can You Spot It? (DonatielloII-esahubble).jpg

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Description	English: Right in the middle of this image, nestled amongst a smattering of distant stars and even more distant galaxies, lies the newly discovered dwarf galaxy known as Donatiello II. If you cannot quite distinguish the clump of faint stars that is all we can see of Donatiello II in this image, then you are in good company. Donatiello II is one of three newly discovered galaxies that were so difficult to spot that they were all missed by an algorithm designed to search astronomical data for potential galaxy candidates.
Date	14 February 2023, 10:05 (upload date)
Source	Can You Spot It?
Author	ESA/Hubble & NASA, B. Mutlu-Pakdil Acknowledgment: G. Donatiello
Other versions	TIFF version

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	15:18, 15 April 2023		3,838 × 1,931 (2.11 MB)	OptimusPrimeBot	#Spacemedia - Upload of https://noirlab.edu/public/media/archives/images/large/DonatielloII-esahubble.jpg via Commons:Spacemedia

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Giuseppe Donatiello

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Image title	Right in the middle of this image, nestled amongst a smattering of distant stars and even more distant galaxies, lies the newly discovered dwarf galaxy known as Donatiello II. If you cannot quite distinguish the clump of faint stars that is all we can see of Donatiello II in this image, then you are in good company. Donatiello II is one of three newly discovered galaxies that were so difficult to spot that they were all missed by an algorithm designed to search astronomical data for potential galaxy candidates.
Source	NSF's NOIRLab
Credit/Provider	ESA/Hubble & NASA, B. Mutlu-PakdilAcknowledgment: G. Donatiello
Short title	Can You Spot It?
Usage terms	Creative Commons Attribution 4.0 International License
Date and time of data generation	10:05, 14 February 2023
JPEG file comment	Right in the middle of this image, nestled amongst a smattering of distant stars and even more distant galaxies, lies the newly discovered dwarf galaxy known as Donatiello II. If you cannot quite distinguish the clump of faint stars that is all we can see of Donatiello II in this image, then you are in good company. Donatiello II is one of three newly discovered galaxies that were so difficult to spot that they were all missed by an algorithm designed to search astronomical data for potential galaxy candidates. Even the best algorithms have their limitations when it comes to distinguishing very faint galaxies from individual stars and background noise. In these most challenging identification cases, discovery has to be done the old-fashioned way — by a dedicated human trawling through the data themselves. The data that enabled these discoveries was collected by the Dark Energy Survey (DES), an intense observation effort that spanned six years, and was carried out using the Dark Energy Camera (DECam), which is mounted on the Víctor M. Blanco 4-metre Telescope at Cerro Tololo Inter-American Observatory, a Program of NSF’s NOIRLab. As is the case for most major telescopes that receive public funding, the DES data were made available to the public. That is when the experienced amateur astronomer Giuseppe Donatiello stepped in. He laboriously processed and analysed chunks of the DES data, and made his discovery — three very faint galaxies, now named Donatiello II, III and IV respectively. All three are satellites of the well known Sculptor galaxy (otherwise known as NGC 253), meaning that they are all bound gravitationally to their much more massive companion. This image comes from an observing programme from the NASA/ESA Hubble Space Telescope. Based on their own independent search, a team led by Burçin Mutlu-Pakdil used Hubble to obtain long-exposure images of several faint galaxies, including Donatiello II. With the Hubble images, they were able to confirm their target galaxies’ association with NGC 253 — thereby providing both an independent confirmation of Donatiello’s discovery, and this new Picture of the Week. [Image description: A black, mostly empty field with a variety of stars and galaxies spread across it. Most are very small. A couple of galaxies and stars are larger with visible details. In the centre is a relatively small, irregularly-shaped galaxy; it is formed of many very small stars and a few slightly larger, bright stars, all surrounded by a very faint glow that marks the borders of the galaxy.] Links Hubble paper in the Astrophysical Journal Video of Can You Spot It?
Software used	Adobe Photoshop 23.5 (Windows)
File change date and time	16:23, 2 February 2023
Date and time of digitizing	17:17, 23 August 2022
Date metadata was last modified	17:23, 2 February 2023
Unique ID of original document	xmp.did:4cc6b6bc-af0e-974f-819f-5445eb6a96c8
Contact information	https://noirlab.edu 950 North Cherry Ave. Tucson, AZ, 85719 USA
IIM version	4

File:Can You Spot It? (DonatielloII-esahubble).jpg

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