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Specification for the Siril HEALpixel Catalog Format

Published 21 Jan 2025 in astro-ph.IM | (2501.12466v1)

Abstract: This document specifies the structure of the Siril Catalog Format, designed to support efficient storage and querying of nested HEALpixel based astronomical catalogs such as Gaia DR3. The format includes a fixed length header, an index for rapid look-up, and structured data records optimized for space and speed. The document also outlines recommended search strategies for utilizing the format effectively.

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