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The Danish 1.54-m Telescope
La Silla Night Sky Brightness
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La Silla Night Sky Brightness
The following table gives the sky brightness as measured at CTIO as
function of the phase of the Moon. Especially during bright Moon, the
measured values at the Danish may be higher due to scattered light inside
the dome.
Days from
New Moon
| U | B | V | R | I |
| 0 | 22.0 | 22.7 | 21.8 | 20.9 | 19.9
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| 3 | 21.5 | 22.4 | 21.7 | 20.8 | 19.9
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| 7 | 19.9 | 21.6 | 21.4 | 20.6 | 19.7
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| 10 | 18.5 | 20.7 | 20.7 | 20.3 | 19.5
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| 14 | 17.0 | 19.5 | 20.0 | 19.9 | 19.2
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Skybrightness (in units of magnitude per square arcsecond) as a
function of the Moon phase for several filters. The values are taken
from a NOAO newsletter (Walker 1987) and measured at Tololo, near La
Silla.
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