# First observations with the 25 cm telescope of the Shumen Astronomical Observatory

## TL;DR

This paper reports initial observations with a 25 cm telescope at Shumen Observatory, demonstrating its capabilities for variable star monitoring, imaging extended objects, and remote operation, establishing its utility for diverse astronomical research.

## Contribution

First observational results with the 25 cm telescope at Shumen Observatory, confirming its effectiveness for variable star photometry, imaging, and remote control.

## Key findings

- Variable stars brighter than 14 mag can be observed with good quality.
- The telescope can image objects up to 30 arcmin with 0.88 arcsec/pix resolution.
- The setup is suitable for long-term patrols and remote operation.

## Abstract

The first observations with the 25 cm telescope of the Shumen Astronomical Observatory led to the following conclusions: (a) Intra-night observations of variable stars with an amplitude larger than 0.1 mag are possible down to 14 mag with an acceptable quality with this setup; (b) The equipment is suitable for observations of bright extended objects with sizes up to 30 arcmin (planets, comets, clusters, nebulae, galaxies) with resolution 0.88 arcsec/pix; (c) The guiding of telescope is very good which makes the equipment appropriate for prolonged patrols; (d) The observations with the 25 cm are already fully remote-controlled; (e) The determined transformation coefficients allow transfer from instrumental to standard photometric system BVRcIc and realization of differential photometry.