Мета роботи: визначити показник заломлення скляної пластини з паралельними гранями (скляної призми).
Обладнання: скляна плоскопаралельна пластина (скляна призма), аркуш паперу з накресленими паралельними лініями, олівець, лінійка (трикутник, циркуль, інше канцелярське знаряддя).

1. Покладіть на аркуш плоскопаралельну скляну пластину перпендикулярно до накреслених (роздрукованих) ліній (рис. 1).

ZTF19aaumtxz/Gaia19btn/AT2019fdawas discovered on 2019-05-09 by J. Nordin, V. Brinnel, M. Giomi, J. van Santen (HU Berlin), A. Gal-Yam, O. Yaron, S. Schulze (Weizmann) on behalf of ZTF team at magnitude r-ZTF = 15.43 and rediscovered on 2019-05-12 by A. Delgado, D. Harrison, S. Hodgkin, M. van Leeuwen, G. Rixon, A. Yoldas (University of Cambridge), on behalf of Gaia Alerts team.

Object was discovered on 2017-11-02 and alerted on 2017-11-07 by A. Delgado, D. Harrison, S. Hodgkin, M. van Leeuwen, G. Rixon, A. Yoldas (University of Cambridge), on behalf of Gaia Alerts team.

First follow-up observations were provided by Terskol observatory on 2017-11-17 and 2017-11-18 during the declinig phase. Results were published in The Astronomer's Telegram .

Here we are present the results of mostly 10-years monitoring of selected Be/X-ray binaries. We pay most attention on 1H1936+541 and 1H2202+501.

Composite lightcurve of 2015 DP155 (R-band observations)

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In 2017 at the Lisnyky Observationsl Station 2 new Main Belt asteroids were discovered and 1 Main Belt asteroid was rediscovered. They are: 2017 ST39, 2017 SV39 and 2017 TS7.

The nearest periods for observations of these asteroids will bw the next: