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monodera/convert_maggy_to_mag.py

Created February 20, 2026 04:07
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Convert maggy to AB magnitude with astropy.units
Raw
convert_maggy_to_mag.py
# /// script
# dependencies = [
# "astropy",
# ]
# ///
#
# ref: https://www.sdss4.org/dr17/algorithms/magnitudes/
#
from astropy import units as u
flux_in_maggy = 10 * u.nanomaggy
flux0 = (0. * u.ABmag).to(u.Jy) # 1 maggy ~ 3631 Jy
mag_ab = flux_in_maggy.to(u.ABmag, equivalencies=u.zero_point_flux(flux0))
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