Map of Arkhyz gorge and regional center Zelenchukskaya
Fragment of tourist map 'Karachai-Cherkessian Republic',
KartInform-RosKartographia, Pyatigorsk, 2006.
Light pollution sources.
Figure 8. Photos of kazak village Zelenchukskaya and surrounding communities
located at the direct visibility from BTA observational sight taken at night
in three dates between November 2006 and January 2008. On 2007 February 17,
the lighting of power station dam in Dausuz was switched on (marked by an arrow).
The strongest sodium lines are installed near the power station in Dausuz.
The nearby regional center, kazak village Zelenchukskaya is located
at the direct visibility from the BTA observational sight at the distance
of 25 km. Views of village at night are shown in the Fig. 8. The negative
image taken at night is superimposed on daytime image in winter at the Fig. 9.
Other light sources are identified in this picture, too. They are Dausuz
the community where the hydroelectric power station is built recently;
the kazak village Kardonikskaya, and communities of Zhako and Ali-Berdykovsky.
RATAN-600 radio telescope, and Zelenchuk radio observatory are also light
sources located in direct visibility. Since 2006 no essential changes in the
city lights are noted excluding indeed the dam of power station, sometimes,
it is illuminated with 15 powerful uncovered lamps. In Zelenchukskaya and
Dausuz, one may count about 260 street lamps at the direct visibility.
Here, in the vast scale one can check these
Photo of Zelenchuk village, and other surrounding communities taken from
the observational sight of SAO in the winter daytime, the negative night photo
is superimposed. General light sources are identified.
The astronomers' village Nizhnyj Arkhyz located at the distance of 3.5 km
is the nearest locality to BTA. One can found that the astronomers' village
is 7.9 times closer to BTA than the center of Zelenchukskaya using only this
map and a ruler. As illumination by a light source is proportional to
squired distance to it, the interference from one lamp in the astronomers'
village is equal to 62 lamps in Zelenchukskaya (7.92)!
The astronomers' village does not located on the direct visibility from
the BTA sight, but the light of its illumination scatters easily in the air
over the telescope. So, the only 4 lamps are enough to give the same effect
as that one of 260 lamps in Zelenchukskaya. Here we present the facts which
give the evidence that namely the astronomers' village is now the main source
of light pollution of the sky for BTA. Partly, we use the method by
International Dark-Sky Association to check the efficiency of
street lights photographing the light sources in the fog. The following
are such photos with the explanations.
Figure 10. Nighttime photo in the fog (left), and daytime photo (right) of the
village. View from the north from refuelling station. Evidently, the light of
lamps spreads easily upwards. Effect is strongest inspite of absence the snow
cover at the time of taking this photo.
Figure 11. Nighttime photo in the fog (left), and daytime photo (right) of village
from south-east. Snow cover is absent. Power glow is the light of lamps
scattered on the fog drops and spreading easily upwards.
Figure 12. Economic parts and garage of SAO in the astronomers' village.
Nighttime view from Zelenchukskaya - Arkhyz road.
Figure 13. Powerful glow-discharge lamp of SAO firehouse is installed so as
its light is going just in the direction to BTA to be of largest harm for
the observations. Similarly, two other lamps are installed on the buildings
of boiler-house and storehouse for fuel. Near the control pass unit, such a lamp
is installed vertically and directed opposite of BTA but it illuminates
large field and surrounding hills. With the snow cover, all this light is
Night sky spectrum of the Special Astrophysical
Observations of relative intensities of HgI and NaI
Characteristics of interference due to light pollution at
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.