Looking through the Dark Cloud B68

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 is a false-colour, infrared composite photo of the dark cloud Barnard 68, obtained on March 8-9, 1999, with the SOFI instrument at the ESO 3.5-m New Technology Telescope (NTT) at La Silla. Three exposures were made through J- (wavelength 1.25 µm - 3 min; here colour-coded as "blue"), H- (1.65 µm - 30 min; "green") and Ks-filters (2.16 µm - 30 min; "red"), respectively. The "reddening" of the background stars that are seen through the cloud is very obvious. It is due to the larger obscuration in shorter wavebands. The sky field measures about 4.9 x 4.9 arcmin 2 (1024x1024 pixels). A slight mismatch between the individual frames is present in the upper corners; this is caused by atmospheric effects. The pixel size is 0.29/arcsec. North is up and East is left.

Créditos:

ESO

Sobre a imagem

Id:eso9934a
Tipo:Observação
Data de divulgação:2 de Julho de 1999
Notícias relacionadas:eso9934
Tamanho:3000 x 3008 px

Sobre o objeto

Nome:B 68, Barnard 68
Tipo:Milky Way : Nebula : Appearance : Dark : Molecular Cloud
Milky Way : Nebula : Appearance : Dark : Bok Globule
Distância:500 anos-luz
Constellation:Ophiuchus
Categoria:Nebulae

Formatos de imagens

JPEG grande
2,8 MB

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Papéis de parede

1024x768
501,4 KB
1280x1024
740,4 KB
1600x1200
951,8 KB
1920x1200
1018,4 KB
2048x1536
1,3 MB

Coordenadas

Position (RA):17 22 38.21
Position (Dec):-23° 49' 34.93"
Field of view:4.87 x 4.89 arcminutes
Orientação:O norte está a 0.1° à esquerda da vertical

Cores e filtros

BandaComprimento de ondaTelescópio
Infravermelho
J
1.25 μmNew Technology Telescope
SOFI
Infravermelho
H
1.65 μmNew Technology Telescope
SOFI
Infravermelho
K
2.16 μmNew Technology Telescope
SOFI