Observations

Time allocation rules

The observation time of the Perek 2-m telescope is allocated on the basis of the collected observing nights requests by the head of the stellar physics department or by the trustworthy persons chosen by the head. Currently, the responsible persons for the time allocation are Tiina Liimets and Marek Skarka.

The observing night requests should be sent by 9th of each month, for the next month to Tiina Liimets and Marek Skarka. In the afternoon, 10th of each month, the list of the approved observing nights will be available in the list of allocated nights.

If observing night requests require specific dates/Moon phase, it should be stated in the proposal with a brief explanation. If a conflict of interest occurs, it will be solved case by case. After the first schedule is released, based on a “first requested, first taken” style, additionally it will be possible to ask for the nights that will stay free.

Currently, the entire observing time of the Perek 2-m telescope is allocated to the regular observation programs of the members of the department. The observing nights requests from all non-members of the stellar physics department should be sent directly to the head of the department Brankica Kubátová.

Observing conditions in Ondřejov

The observing conditions are given by the location of Ondřejov in the middle Europe. The typical seeing is about 3 arcseconds and only rarely falls below 2 arcseconds. The distribution of observing time through the year 2020 can be seen in following figure. The winter months are usually very poor regarding the observing nights, while March-April and June-September are the months with the highest percentage of usable observing time.

Distribution of observing hours for 2020. The grey-shaded columns (with numbers in white) show for each month the total amount of hours available for observations (when the Sun is 12 degrees below the horizon). Blue columns and corresponding numbers in yellow boxes show the number of used observing hours (shutter open time of scientific targets together for all available devices – 700 and OES spectrographs, and photometric CCD camera). The numbers in the green boxes represent the percentage of actually used observing hours. Credit: P. Škoda, 2021

Observation statistics

Graphs lower on the page show distribution of observing hours for years 2011-2019. The grey-shaded columns (with numbers in white) show for each month the total amount of hours available for observations (when the Sun is 12 degrees below the horizon). Blue columns and corresponding numbers in yellow boxes show the number of used observing hours (camera shutter open time of scientific targets together for all available devices – 700 and OES spectrographs and in years 2019 and 2020 also photometric CCD camera; calibrations are excluded). The numbers in the green boxes represent the percentage of actually used observing hours.

2019 (Sep.-Dec., technical shutdown)
2018
2017 (Jan.-Feb., technical shutdown)
2016 (Apr.-Dec., technical shutdown)
2015
2014
2013
2012
2011

Older statistical data in the same graphical form are also available:

Additional tools

Weather monitor: Meteostation

Sky monitor: AllSky