UBVRI Photometric Standard Stars Around the Celestial Equator: Updates and Additions

TL;DR

This paper updates and expands a list of standard stars around the celestial equator with new UBVRI photometric measurements, enhancing the calibration resources for astronomical observations.

Contribution

It provides new and revised photometric data for 202 standard stars, improving the accuracy and coverage of the celestial equatorial standard star catalog.

Findings

Expanded the catalog to include 202 stars with new measurements.

Combined new data with previous work to cover a broad magnitude and color range.

Established a homogeneous standard photometric system around the sky.

Abstract

New broadband UBVRI photoelectric observations on the Johnson-Kron-Cousins photometric system have been made of 202 stars around the sky, and centered at the celestial equator. These stars constitute both an update of and additions to a previously published list of equatorial photometric standard stars. The list is capable of providing, for both celestial hemispheres, an internally consistent homogeneous broadband standard photometric system around the sky. When these new measurements are included with those previously published by Landolt (1992), the entire list of standard stars in this paper encompasses the magnitude range 8.90 < V < 16.30, and the color index range -0.35 < (B - V) < +2.30.