The dark cloud B68 at different wavelengths

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 µm; "green-yellow" V-band at 0.55 µm; near-infrared I-band at 0.90 µm) 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 µm; H-band at 1.65 µm; Ks-band at 2.16 µm). 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.

Credit:

ESO

Over de afbeelding

Id:eso9934b
Type:Observatie
Publicatiedatum:2 juli 1999
Gerelateerde berichten:eso9934
Grootte:3727 x 2480 px

Over het object

Naam:B 68, Barnard 68
Type:Milky Way : Nebula : Appearance : Dark : Molecular Cloud
Milky Way : Nebula : Appearance : Dark : Bok Globule
Afstand:500 lichtjaren
Categorie:Nebulae

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Kleuren & filters

BandGolflengteTelescoop
Infrarood
K
2.16 μmNew Technology Telescope
SOFI
Infrarood
H
1.65 μmNew Technology Telescope
SOFI
Infrarood
J
1.25 μmNew Technology Telescope
SOFI
Infrarood
I
900 nmVery Large Telescope
FORS1
Optisch
V
550 nmVery Large Telescope
FORS1
Optisch
B
440 nmVery Large Telescope
FORS1