ASASSN-V J235154.14+381726.8

Pierre Knötzele & Dominic Rodemer

During the advanced lab course of the Department of Physics at TU Darmstadt, a variable star was to be observed for the experiment “Photometry in Astrophysics”. The star ASASSN-V J235154.14+381726.8 in the constellation Andromeda was chosen. The TURMX telescope was programmed for automatic recording in the night of November 18th and November 19th 2022. We programmed the system for continuously recording frames at a time interval of 120 seconds over the course of the night. Unfortunately, due to gathering clouds, the recording was terminated prematurely by the control system in the 2nd half of the night. Nevertheless, sufficient data could be obtained for an evaluation.

The photometric evaluation of the data was carried out with the software Muniwin. Since an absolute measurement of the brightness of stars is not easily possible, magnitude differences between the observed object and selected reference objects are determined in Muniwin. The time series of the magnitude differences was converted into radiation flux ratios for further evaluation. A light curve was then modelled for the time series of radiant flux ratios using a Fourier-Series.

From the model, the period duration with (0.056±0.004)d and a magnitude variation of (0.3226±0.0026)mag were determined. Catalogue data give reference values with a period of 0.056 d and a magnitude variation of 0.36 mag. This corresponds to a relative deviation of the period of 1.7% and a relative deviation of the magnitude variation of 10.4%.

In the data, one more variable object was found and evaluated.  A periodically variable star was found, whose light curve was modelled using a Fourier-Series. The variable star was identified as WISE J190412.5+50005 in the constellation Draco.