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 choosen by the head. Currently, the resposible 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 nigth 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 clear nights can be seenin Fig. 1. 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.

Fig. 1. The typical yearly distribution of observing hours from 2015. The grey-shaded columns show the total amount of hours when the Sun is 12 degrees below the horizon, the colored columns and corresponding numbers in yellow show the number of usable observing hours, the numbers in the pink boxes show the percentage of usable observing hours. Figure from Kabáth et al., 2020, PASP, 132, 1009.

Additional tools

Weather monitor: Meteostation

Sky monitor: AllSky