A globular clusters striking red eye

Esahubble_potw1832a_1024

esahubble_potw1832a August 6th, 2018

Credit: ESA/Hubble & NASA

This Picture of the Week shows the colourful globular cluster NGC 2108. The cluster is nestled within the Large Magellanic Cloud, in the constellation of the Swordfish (Dorado). It was discovered in 1835 by the astronomer, mathematician, chemist and inventor John Herschel, son of the famous William Herschel. The most striking feature of this globular cluster is the gleaming ruby-red spot at the centre left of the image. What looks like the clusters watchful eye is actually a carbon star. Carbon stars are almost always cool red giants, with atmospheres containing more carbon than oxygen the opposite to our Sun. Carbon monoxide forms in the outer layer of the star through a combination of these elements, until there is no more oxygen available. Carbon atoms are then free to form a variety of other carbon compounds, such as C2, CH, CN, C3 and SiC2, which scatter blue light within the star, allowing red light to pass through undisturbed. This image was captured by the NASA/ESA Hubble Space Telescopes Advanced Camera for Surveys (ACS), using three different filters.

Image Source: https://www.spacetelescope.org/images/potw1832a/

Curator: ESA/Hubble, Garching bei München, Germany

Image Use Policy: Creative Commons Attribution 4.0 International License

Image Details

Image Type
Observation
Object Name
NGC 2108
Subject - Milky Way
Star > Grouping > Cluster > Globular
Esahubble_potw1832a_128
 

Position Details

Position (ICRS)
RA = 5h 44m 6.3s
DEC = -69° 10’ 28.3”
Orientation
North is 27.6° CCW
Field of View
3.3 x 2.6 arcminutes
Constellation
Dorado

Color Mapping

  Telescope Spectral Band Wavelength
Arrow_left_blue Hubble Space Telescope (ACS) Optical (B) 435.0 nm
Arrow_left_green Hubble Space Telescope (ACS) Optical (V) 555.0 nm
Arrow_left_red Hubble Space Telescope (ACS) Optical (I) 814.0 nm
Spectrum_base
Arrow_top_blue
Arrow_top_green
Arrow_top_red
Esahubble_potw1832a_1280
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ID
potw1832a
Subject Category
B.3.6.4.2  
Subject Name
NGC 2108
Credits
ESA/Hubble & NASA
Release Date
2018-08-06T06:00:00
Lightyears
Redshift
Reference Url
https://www.spacetelescope.org/images/potw1832a/
Type
Observation
Image Quality
Distance Notes
Facility
Hubble Space Telescope, Hubble Space Telescope, Hubble Space Telescope
Instrument
ACS, ACS, ACS
Color Assignment
Blue, Green, Red
Band
Optical, Optical, Optical
Bandpass
B, V, I
Central Wavelength
435, 555, 814
Start Time
Integration Time
Dataset ID
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
86.0263424068, -69.1745410259
Reference Dimension
3908.0, 3110.0
Reference Pixel
1954.0, 1555.0
Scale
-1.38766846824e-05, 1.38766846824e-05
Rotation
27.55999999999997
Coordinate System Projection:
TAN
Quality
Full
FITS Header
Notes
Creator (Curator)
ESA/Hubble
URL
http://www.spacetelescope.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
ESA/Hubble
Publisher ID
esahubble
Resource ID
potw1832a
Metadata Date
2018-07-21T10:51:53+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.