# Verification of Photometric Parallaxes with Gaia DR2 Data

## TL;DR

This study compares Gaia DR2 parallaxes with those derived from multicolor photometric data across several large sky surveys, demonstrating the potential and limitations of photometric methods for stellar distance estimation within 4400 parsecs.

## Contribution

It introduces a method to estimate stellar parallaxes and interstellar extinction using combined survey data, highlighting the importance of correct stellar luminosity classification.

## Key findings

- Photometric data can estimate parallaxes for stars within 4400 pc.
- Proper stellar luminosity class determination is crucial.
- Photometric methods are effective for bright, nearby stars.

## Abstract

Results of comparison of Gaia DR2 parallaxes with data derived from a combined analysis of 2MASS (Two Micron All-Sky Survey), SDSS (Sloan Digital Sky Survey), GALEX (Galaxy Evolution Explorer), and UKIDSS (UKIRT Infrared Deep Sky Survey) surveys in four selected high-latitude $|b|>48^{\circ}$ sky areas are presented. It is shown that multicolor photometric data from large modern surveys can be used for parameterization of stars closer than 4400 pc and brighter than $g_{SDSS} = 19.^m6$, including estimation of parallax and interstellar extinction value. However, the stellar luminosity class should be properly determined.