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.
Källa:ESO
Om bilden
ID: | eso9934a |
Typ: | Observation |
Publiceringsdatum: | 2 juli 1999 |
Relaterade pressmeddelanden: | eso9934 |
Storlek: | 3000 x 3008 px |
Om objektet
Namn: | B 68, Barnard 68 |
Typ: | Milky Way : Nebula : Appearance : Dark : Molecular Cloud Milky Way : Nebula : Appearance : Dark : Bok Globule |
Avstånd: | 500 ljusår |
Constellation: | Ophiuchus |
Kategori: | Nebulae |
Skrivbordsunderlägg
Koordinater
Position (RA): | 17 22 38.21 |
Position (Dec): | -23° 49' 34.93" |
Field of view: | 4.87 x 4.89 arcminutes |
Orientering: | Nord är 0.1° vänster om lodrätt |
Färger och filter
Band | Våglängd | Teleskop |
---|---|---|
Infrarött J | 1.25 μm | New Technology Telescope SOFI |
Infrarött H | 1.65 μm | New Technology Telescope SOFI |
Infrarött K | 2.16 μm | New Technology Telescope SOFI |