ANTU after sunset

Night Falls at Paranal — Preparing for the Observations

First calibration observations with ANTU after sunset. The last afterglow is visible on the FORS1 instrument, mounted within the M1 Mirror Cell at the bottom of the telescope structure.

Astronomical observations begin soon after sunset at Paranal.

Normally, they start with a series of test and calibration exposures that serve to determine the exact status of the various instruments, e.g., in terms of sensitivity at different wavelengths.

Some of these exposures are performed on a white target on the inside of the telescope enclosure, others are made on the sky, as it gets progressively darker.

If they are included in a programme, observations of comparatively bright objects may be carried out while the sky is still relatively bright. However, those of the faintest objects must wait until the period of "astronomical twilight" is over, i.e., when the Sun is at least 18° below the horizon.

Mynd/Myndskeið:

ESO

Um myndina

Auðkenni:eso0021g
Tegund:Ljósmynd
Útgáfudagur:16. júní 2000
Tengdar fréttatilkynningar:eso0021
Stærð:1976 x 3000 px

Um fyrirbærið

Nafn:Very Large Telescope, VLT Unit Telescopes
Tegund:Unspecified : Technology : Observatory : Telescope
Flokkur:Paranal

Myndasnið

Stór JPEG
1,6 MB

Bakgrunnsmynd

1024x768
217,2 KB
1280x1024
377,1 KB
1600x1200
578,2 KB
1920x1200
716,7 KB
2048x1536
979,5 KB

 

Sjá einnig