The dark cloud B68 at different wavelengths

Eso_eso9934b_500

eso_eso9934b July 2nd, 1999

Credit: ESO

B68 is a dark cloud situated at a distance of about 500 light-years (160 pc) towards the southern constellation Ophiuchus (The Serpent-holder). This image represents the sky area of the so-called Bok globule Barnard 68 --- nicknamed the Dark Cloud -- imaged in six different wavebands, clockwise from the blue to the near-infrared spectral region. Three of these frames ("blue" B-band at wavelength 440 nm = 0.44 m; "green-yellow" V-band at 0.55 m; near-infrared I-band at 0.90 m) were obtained with the FORS1 instrument at the VLT ANTU telescope and three with SOFI at the NTT through near-infrared filters (J-band at 1.25 m; H-band at 1.65 m; Ks-band at 2.16 m). It is evident that the obscuration caused by the cloud diminishes dramatically with increasing wavelength. Since the outer regions of the cloud are less dense than the inner ones, the apparent size of the cloud also decreases, as more background stars shine through the outer parts. Each frame covers an area of 4.9 x 4.9 arcmin 2. North is up and East is left.

Image Source: https://www.eso.org/public/images/eso9934b/

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
B 68 Barnard 68
Subject - Milky Way
Nebula » Appearance » Dark » Molecular Cloud
Nebula » Appearance » Dark » Bok Globule

Color Mapping

  Telescope Spectral Band Wavelength
Arrow_left_grayscale Very Large Telescope (FORS1) Optical (B) 440.0 nm
Arrow_left_grayscale Very Large Telescope (FORS1) Optical (V) 550.0 nm
Arrow_left_grayscale Very Large Telescope (FORS1) Infrared (I) 900.0 nm
Arrow_left_grayscale New Technology Telescope (SOFI) Infrared (J) 1.3 µm
Arrow_left_grayscale New Technology Telescope (SOFI) Infrared (H) 1.7 µm
Arrow_left_grayscale New Technology Telescope (SOFI) Infrared (K) 2.2 µm
Spectrum_base
Arrow_top_grayscale
Arrow_top_grayscale
Arrow_top_grayscale
Arrow_top_grayscale
Arrow_top_grayscale
Arrow_top_grayscale
Eso_eso9934b_1280
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ID
eso9934b
Subject Category
B.4.2.3.1   B.4.2.3.2  
Subject Name
B 68, Barnard 68
Credits
ESO
Lightyears
Redshift
Reference Url
https://www.eso.org/public/images/eso9934b/
Type
Observation
Image Quality
Distance Notes
Distance in light years from ESO.
Facility
Very Large Telescope, Very Large Telescope, Very Large Telescope, New Technology Telescope, New Technology Telescope, New Technology Telescope
Instrument
FORS1, FORS1, FORS1, SOFI, SOFI, SOFI
Color Assignment
Grayscale, Grayscale, Grayscale, Grayscale, Grayscale, Grayscale
Band
Optical, Optical, Infrared, Infrared, Infrared, Infrared
Bandpass
B, V, I, J, H, K
Central Wavelength
440, 550, 900, 1250, 1650, 2160
Start Time
Integration Time
Dataset ID
Notes
Coordinate Frame
Equinox
Reference Value
Reference Dimension
3727.0, 2480.0
Reference Pixel
Scale
Rotation
Coordinate System Projection:
Quality
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
eso9934b
Metadata Date
2009-01-20T11:40:42+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.