V.V. Vlasyuk, the Deputy director of the Special Astrophysical Observatory.
At the meeting of Commettee of the Large Telescope Subjects: "We will take measures against increasing light pollution for the village illumination".
In the private talk: "We don't have enough means for the improvement of street lighting in the village to remove the light interference. When we receive such means, we will do these works".
Photo of the lighting fixtures on the children ground taken from 9-th floor of home No.3. Left bottom we see the standard fixture with the lamp closed in the special box preventing the light spreading upwards. Evidently, the parasitic light of new fixtures is much brighter than that of standard protected city lamps.
2008 August 11. In the children ground near home No.1, the third similar light fixture with 3 lamps is installed.
To determine the class of lighting fixtures installed on the children grounds, I have taken its spectrum. Digital camera Fuji FinePix with the objective prism was used. They were found to be high-pressure sodium lamps [!]. Description of these lamps may be found in Wikipedia , it is the following: "Yellow-reddish band is the line D of atomic sodium; turquoise line is the sodium emission, too, however it is weak in the discharge under the low pressure but becomes intense in the discharge under the high pressure; majority of other green, blue and violet lines arise from mercury". Specrum below is taken from 9 floor, and this is all what goes upwards in the BTA direction. The new 9 lamps take essential contribution in the interference from astronomers' village. The luminescence from the village is already well seen from BTA sight as a glow in the gorge, and lower clouds seem brighter than the moonless night sky.
(a) Prime image of the light fixture on the children ground, (b) objective prism slitless spectrum of the same fixture, (c) spectrum of high pressure sodium lamp from Wikipedia.
2008 October 6. Two new open binary mercury lamps are installed on the storehouse of SAO without any protection. One of them illuminates just in the BTA direction. Both lamps are similar to that one settled on the home No.4, the SAO hostel.
Open unprotected lamps installed on the SAO storehouse (marked with red arrows).
Night sky spectrum of the Special Astrophysical Observatory.
Observations of relative intensities of HgI and NaI emission lines
Characteristics of interference due to light pollution at the SAO observational sight.
Light pollution sources-1.
Light pollution sources-2.
Results and conclusions.
Continued. Monitoring the situation.
THE WATER-BOTTLING PLANT IS STARTED-UP IN THE CENTER OF LIGHT-PROTECTED ZONE OF 6-METER TELESCOPE.