Index of /jhollan/light/luminance/sites/kolonica

Name	Last modified	Size

Parent Directory		-
allYsm.png	2006-08-22 16:50	30K
sensitivites.png	2006-02-03 17:23	29K
kolo_res.zip	2006-02-03 16:22	87M
Y/	2006-02-03 16:22	-
Yc/	2006-02-03 16:22	-
allLYsm.png	2006-02-03 15:38	33K
allCsm.png	2006-02-03 15:02	26K

Processed images, by Nikon 990 with FC-E8 fish-eye convertor, from the Kolonica saddle, an observatory site of Observatory Humenné, Slovakia. Images and readings by Filip Hroch, processing by Jan Hollan.

The SQM readings were from 21.3 mag to 21.7 mag -- this was the interval of measured faintnesses of one square second, within the large effective space angle of the instrument. Unfortunately, readings and images were not made simultaneously, or at least the times of readings were not recorded.

The computed readings from the images are in the range of 21.3 to 21.5 mag. The view had been partly obstructed by a dome etc.

Y directory contains Y luminances, near to photopic ones. Yc contains C luminances using the same darkframe subtraction (optimized for the Y colour); C luminances are something as an average of photopic and melatonin-affecting sensitivities. C luminances are clearly larger for twilight sky (sun at about -10 degrees) and a bit lower for night images (due probably to some HPS contribution to sky luminance).

Milky Way was mostly overhead, just the morning images have zenith without it. The zenith distance -- luminance graphs (all*.png) are clearly affected by the Milky Way, contributing up to a 0.1 mcd/m².