Representing the "butterfly" projection in FITS - projection code XPH
Mark R. Calabretta, Stuart R. Lowe
TL;DR
This paper formalizes the representation of the 'butterfly' projection, a specific HEALPix-based projection, within the FITS format to standardize its usage in astronomical data.
Contribution
It introduces a formal method for representing the 'butterfly' projection in FITS, enabling consistent application in astronomical imaging.
Findings
Provides a formal FITS representation of the butterfly projection.
Facilitates standardized use of the butterfly projection in astronomical data.
Enhances interoperability of HEALPix-based projections in FITS files.
Abstract
The "butterfly" projection is constructed as the polar layout of the HEALPix projection with (H,K) = (4,3). This short article formalises its representation in FITS.
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