Stephan's Quintet (NGC 7317, NGC 7318A, NGC 7318B, NGC 7319, NGC 7320)

Noirlab_noao-02347_1024

noirlab_noao-02347 June 30th, 2020

Credit: NOIRLab/NSF/AURA

Stephan's Quintet, as its name implies, is a group of five galaxies (NGC7317, 7318A, 7318B, 7319 and 7320) in the constellation Pegasus. This unusual system has often been used as proof that the redshift is not truly a distance indicator, which would completely overturn current cosmology, because although four of the galaxies have similar, large redshifts, the fifth (NGC7320), although apparently a member of the group, shows a much smaller redshift. Conventional theory states that the low-redshift galaxy is in a nearby group (the NGC7331 group) and by coincidence appears on the sky projected against a distant background group. Opponents point to debris and tails around the low-redshift galaxy, suggesting that it is interacting with the high-redshift systems, which would require that all five galaxies be at the same physical location in space. See also our color picture from the 0.9-meter.

Provider: NOIRLab

Image Source: https://noirlab.edu/public/images/noao-02347/

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

Image Use Policy: Creative Commons Attribution 4.0 International License

Image Details

Image Type
Observation
Object Name
NGC 7317 NGC 7318A NGC 7318B NGC 7319 NGC 7320 Stephan's Quintet
Noirlab_noao-02347_128
 

Position Details

Position (ICRS)
RA = 22h 35m 58.4s
DEC = 33° 57’ 40.5”
Orientation
North is 0.7° CCW
Field of View
5.3 x 4.3 arcminutes
Constellation
Pegasus

Color Mapping

  Telescope Spectral Band Wavelength
Grayscale WIYN 0.9-meter Telescope (None) Optical (None) -
Noirlab_noao-02347_1280
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ID
noao-02347
Subject Category
Subject Name
NGC 7317, NGC 7318A, NGC 7318B, NGC 7319, NGC 7320, Stephan's Quintet
Credits
NOIRLab/NSF/AURA
Release Date
2020-06-30T21:34:01
Lightyears
Redshift
Reference Url
https://noirlab.edu/public/images/noao-02347/
Type
Observation
Image Quality
Distance Notes
Facility
WIYN 0.9-meter Telescope
Instrument
None
Color Assignment
Grayscale
Band
Optical
Bandpass
None
Central Wavelength
Start Time
Integration Time
Dataset ID
None
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
338.9932479, 33.961237353
Reference Dimension
2500.0, 2001.0
Reference Pixel
1250.0, 1000.5
Scale
-3.56114649279e-05, 3.56114649279e-05
Rotation
0.66000000000000025
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
noao-02347
Metadata Date
2021-04-22T14:29:46.076308
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.