# An All-Sky Portable (ASP) Optical Catalogue

## TL;DR

This paper introduces a comprehensive all-sky optical catalogue combining multiple major surveys into a single, easily accessible binary format, providing extensive astrometric and photometric data for over a billion sources.

## Contribution

The creation of a unified, large-scale all-sky optical catalogue integrating USNO, APM, and SDSS data in a compact, accessible format with detailed source information.

## Key findings

- Contains over 1.16 billion sources.
- Includes detailed astrometry and photometry for each source.
- Provides a downloadable, efficient data format for broad astronomical use.

## Abstract

This optical catalogue combines the all-sky USNO-B1.0/A1.0 and most-sky APM catalogues, plus overlays of SDSS optical data, into a single all-sky map presented in a sparse binary format which is easily downloaded at 9Gb zipped. Total count is 1,163,237,190 sources and each has J2000 astrometry, red & blue magnitudes with PSFs and variability indicator, and flags for proper motion, epoch, and source survey & catalogue for each of the photometry and astrometry. The catalogue is available on the PASA datastore at http://dx.doi.org/10.4225/50/5807fbc12595f .