# SDSS J102146.44+234926.3: New WZ Sge-type dwarf nova

## TL;DR

This paper reports the discovery and analysis of SDSS J102146.44+234926.3 as a new WZ Sge-type dwarf nova, based on photometry, spectroscopy, archival data, and calibration of comparison stars, highlighting its unique outburst characteristics.

## Contribution

It provides the first detailed observational characterization of SDSS J1021 as a WZ Sge-type dwarf nova, including photometric calibration and archival analysis.

## Key findings

- Large 7-magnitude outburst amplitude observed.
- Presence of superhumps with a period below the period gap.
- Rebrightening observed during the decline of superoutburst.

## Abstract

We report CCD photometry and spectroscopy during 2006 outburst of the dwarf nova SDSS J102146.44+234926.3 (SDSS J1021). The photographic plates from the MAO, SAI and CrAO plate archives, which cover the position of the SDSS J1021, were inspected for the presence of previous outbursts. We also present the BVRcIc photometric calibration of 52 stars in SDSS J1021 vicinity, which have V-magnitude in the range of 11.21-17.23m and can serve as comparison stars. The large amplitude of the SDSS J1021 outburst of 7m, superhumps with a period below the ''period gap'', rebrightening during the declining stage of superoutburst, rarity of outbursts and obtained spectrum allow to classify this object as a WZ Sge type dwarf nova.