A diamond in the rough

Eso_potw1805a_1024

eso_potw1805a January 29th, 2018

Credit: ESO/M. Bellazzini et al.

Squint or you’ll miss it! At the very centre of this image, taken with the VIMOS instrument attached to ESO’s Very Large Telescope (VLT), you can just about see the faint and fuzzy blue form of a distant galaxy known as the Sagittarius Dwarf Irregular Galaxy. Discovered in 1977 with the ESO 1-metre Schmidt telescope, situated at ESO’s La Silla observatory, the irregularly shaped — hence the name — dwarf galaxy is approximately 3 million light-years away in the constellation of Sagittarius (The Archer). It is the most distant member of the Local Group of galaxies, of which the Milky Way is a member. Unlike normal galaxies, dwarf galaxies are typically smaller and host a relatively small number of stars. Gravitational tugs from nearby galaxies can often distort the spherical and disc-like shapes of these fragile galaxies — this very process may be responsible for the slightly rectangular shape of this particular dwarf galaxy.Acknowledgement: M. Bellazzini et al.

Provider: European Southern Observatory

Image Source: https://www.eso.org/public/images/potw1805a/

Curator: European Southern Observatory, Garching bei München, Germany

Image Use Policy: Creative Commons Attribution 4.0 International License

Image Details

Image Type
Observation
Object Name
Sagittarius Dwarf Irregular Galaxy
Subject - Local Universe
Galaxy > Size > Dwarf
Eso_potw1805a_128
 

Position Details

Position (ICRS)
RA = 19h 29m 59.9s
DEC = -17° 40’ 57.7”
Orientation
North is up
Field of View
21.9 x 20.2 arcminutes
Constellation
Sagittarius

Color Mapping

  Telescope Spectral Band Wavelength
Red VLT (VIMOS) Optical (I) -
Green VLT (VIMOS) Optical (I) -
Green VLT (VIMOS) Optical (V) -
Blue VLT (VIMOS) Optical (V) -
Eso_potw1805a_1280
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ID
potw1805a
Subject Category
C.5.2.2  
Subject Name
Sagittarius Dwarf Irregular Galaxy
Credits
ESO/M. Bellazzini et al.
Release Date
2018-01-29T06:00:00
Lightyears
Redshift
Reference Url
https://www.eso.org/public/images/potw1805a/
Type
Observation
Image Quality
Distance Notes
Facility
Very Large Telescope, Very Large Telescope, Very Large Telescope, Very Large Telescope
Instrument
VIMOS, VIMOS, VIMOS, VIMOS
Color Assignment
Red, Green, Green, Blue
Band
Optical, Optical, Optical, Optical
Bandpass
I, I, V, V
Central Wavelength
Start Time
Integration Time
Dataset ID
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
292.499725668, -17.6826960422
Reference Dimension
6408.0, 5911.0
Reference Pixel
3204.0, 2955.5
Scale
-5.69413986566e-05, 5.69413986566e-05
Rotation
-0
Coordinate System Projection:
TAN
Quality
Full
FITS Header
Notes
Creator (Curator)
European Southern Observatory
URL
http://www.eso.org
Name
Email
Telephone
Address
Karl-Schwarzschild-Strasse 2
City
Garching bei München
State/Province
Postal Code
D-85748
Country
Germany
Rights
Creative Commons Attribution 4.0 International License
Publisher
European Southern Observatory
Publisher ID
eso
Resource ID
potw1805a
Metadata Date
2017-06-09T15:33:05+02:00
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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