Recently Discovered Dwarf Galaxy Donatiello II

Noirlab_iotw2306a_1024

noirlab_iotw2306a February 8th, 2023

Credit: Dark Energy Survey/DOE/FNAL/DECam/CTIO/NOIRLab/NSF/AURA/G. DonatielloImage processing: D. de Martin (NSF NOIRLab) & M. Zamani (NSF NOIRLab)

The smudge in the center of this image from the Dark Energy Camera (DECam), built by the US Department of Energy, is the elusive dwarf galaxy Donatiello II. It is one of six dwarf galaxies discovered by Italian amateur astronomer Giuseppe Donatiello. Three of them — Donatiello II, III and IV — were tucked away in the DECam images, and are now known to be satellites of the Sculptor Galaxy (NGC 253) (outside the field, to the far right). DECam is an instrument on the Víctor M. Blanco 4-meter Telescope at Cerro Tololo Inter-American Observatory (CTIO), a Program of NSF NOIRLab. It combines a wide field of view with high sensitivity, meaning that it can scan large swathes of the night sky and also pick out the faint stars making up neighboring dwarf galaxies such as this one. The Milky Way shares its patch of the Universe with a whole host of small galaxies and star clusters, which help astronomers shed light on the yet-to-be-understood physics of dark matter. 

Provider: NOIRLab

Image Source: https://noirlab.edu/public/images/iotw2306a/

Curator: NSF's NOIRLab, Tucson, AZ, USA

Image Use Policy: Creative Commons Attribution 4.0 International License

Image Details Image Details

Image Type
Observation
Object Name
Donatiello II
Noirlab_iotw2306a_128
 

Position Details Position Details

Position (ICRS)
RA = 0h 47m 7.8s
DEC = -23° 57’ 16.8”
Orientation
North is 0.7° CW
Field of View
11.9 x 7.6 arcminutes
Constellation
Cetus

Color Mapping Details Color Mapping

  Telescope Spectral Band Wavelength
Red Blanco-4m (DECam) Optical (z) 926.0 nm
Yellow Blanco-4m (DECam) Optical (i) 784.0 nm
Cyan Blanco-4m (DECam) Optical (r) 642.0 nm
Blue Blanco-4m (DECam) Optical (g) 473.0 nm
Spectrum_base
Red
Yellow
Cyan
Blue
Noirlab_iotw2306a_1280
×
ID
iotw2306a
Subject Category
Subject Name
Donatiello II
Credits
Dark Energy Survey/DOE/FNAL/DECam/CTIO/NOIRLab/NSF/AURA/G. DonatielloImage processing: D. de Martin (NSF NOIRLab) & M. Zamani (NSF NOIRLab)
Release Date
2023-02-08T12:00:00
Lightyears
Redshift
Reference Url
https://noirlab.edu/public/images/iotw2306a/
Type
Observation
Image Quality
Distance Notes
Facility
Víctor M. Blanco 4-meter Telescope, Víctor M. Blanco 4-meter Telescope, Víctor M. Blanco 4-meter Telescope, Víctor M. Blanco 4-meter Telescope
Instrument
DECam, DECam, DECam, DECam
Color Assignment
Red, Yellow, Cyan, Blue
Band
Optical, Optical, Optical, Optical
Bandpass
z, i, r, g
Central Wavelength
926, 784, 642, 473
Start Time
Integration Time
Dataset ID
None, None, None, None
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
11.782583326, -23.9546571923
Reference Dimension
2699.0, 1742.0
Reference Pixel
1349.5, 871.0
Scale
-7.31757711444e-05, 7.31757711444e-05
Rotation
-0.74000000000000021
Coordinate System Projection:
TAN
Quality
Full
FITS Header
Notes
Creator (Curator)
NSF's NOIRLab
URL
https://noirlab.edu
Name
Email
Telephone
Address
950 North Cherry Ave.
City
Tucson
State/Province
AZ
Postal Code
85719
Country
USA
Rights
Creative Commons Attribution 4.0 International License
Publisher
NSF's NOIRLab
Publisher ID
noirlab
Resource ID
iotw2306a
Metadata Date
2023-02-03T14:36:25+01:00
Metadata Version
1.1
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Detailed color mapping information coming soon...

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There is no distance meta data in this image.

 

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