One Galaxy, Three Times

Esahubble_potw2147a_1024

esahubble_potw2147a November 22nd, 2021

Credit: ESA/Hubble & NASA, E. Wuyts

This star- and galaxy-studded image was captured by Hubble’s Wide Field Camera 3 (WFC3), using data that were collected for scientific purposes. The object of interest was a galaxy that is visible in the bottom right corner of the image, named SGAS 0033+02. What makes this particular galaxy interesting is a little unusual — it appears not just once in this image, but three times. The thrice-visible galaxy is a little difficult to spot: it appears once as a curved arc and twice more as small round dots around the star. SGAS 0033+02’s multiple appearances in the same image are not the result of an error, but instead are due to a remarkable phenomenon known as gravitational lensing. Gravitational lensing occurs when the light from a very distant galaxy — such as SGAS 0033+02 — is curved (or ‘lensed’) by the gravity of a massive celestial object that lies in the foreground, between the distant galaxy and the Earth. SGAS 0033+02 was discovered by its namesake, the Sloan Giant Arcs Survey (SGAS), which aimed to identify highly magnified galaxies that were gravitationally lensed by foreground galaxy clusters. SGAS 0033+02 is of special interest because of its highly unusual proximity in the sky to a very bright star. The star is useful, because it can be used to calibrate and correct observations of the lensed SGAS 0033+02. Links Video of One Galaxy, Three Times

Provider: Hubble Space Telescope | ESA

Image Source: https://esahubble.org/images/potw2147a/

Curator: ESA/Hubble, Baltimore, MD, United States

Image Use Policy: Creative Commons Attribution 4.0 International License

Image Details

Image Type
Observation
Object Name
Galaxies Stars
Esahubble_potw2147a_128
 

Position Details

Position (ICRS)
RA = 0h 33m 40.0s
DEC = 2° 42’ 51.7”
Orientation
North is 82.6° CCW
Field of View
2.3 x 2.0 arcminutes
Constellation
Pisces

Color Mapping

  Telescope Spectral Band Wavelength
Red Hubble (WFC3) Infrared (JH) 1.4 µm
Yellow Hubble (WFC3) Infrared (Y) 1.1 µm
Green Hubble (WFC3) Optical (I) 814.0 nm
Blue Hubble (WFC3) Optical (V) 555.0 nm
Blue Hubble (WFC3) Optical (Strömgren v) 410.0 nm
Spectrum_base
Red
Yellow
Green
Blue
Blue
Esahubble_potw2147a_1280
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ID
potw2147a
Subject Category
Subject Name
Galaxies, Stars
Credits
ESA/Hubble & NASA, E. Wuyts
Release Date
2021-11-22T06:00:00
Lightyears
Redshift
Reference Url
https://esahubble.org/images/potw2147a/
Type
Observation
Image Quality
Distance Notes
Facility
Hubble Space Telescope, Hubble Space Telescope, Hubble Space Telescope, Hubble Space Telescope, Hubble Space Telescope
Instrument
WFC3, WFC3, WFC3, WFC3, WFC3
Color Assignment
Red, Yellow, Green, Blue, Blue
Band
Infrared, Infrared, Optical, Optical, Optical
Bandpass
JH, Y, I, V, Strömgren v
Central Wavelength
1400, 1050, 814, 555, 410
Start Time
Integration Time
Dataset ID
None, None, None, None, None
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
8.41650804141713, 2.7143574497035186
Reference Dimension
3467.0, 3096.0
Reference Pixel
1733.5, 1548.0
Scale
-1.1005676686525851e-05, 1.1005676686525851e-05
Rotation
82.560000000000016
Coordinate System Projection:
TAN
Quality
Full
FITS Header
Notes
Creator (Curator)
ESA/Hubble
URL
https://esahubble.org
Name
Email
Telephone
Address
ESA Office, Space Telescope Science Institute, 3700 San Martin Dr
City
Baltimore
State/Province
MD
Postal Code
21218
Country
United States
Rights
Creative Commons Attribution 4.0 International License
Publisher
ESA/Hubble
Publisher ID
esahubble
Resource ID
potw2147a
Metadata Date
2021-11-04T19:04:12+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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