In this work , we updated the catalog of Galactic Cepheids with 24 \mu \mathrm { m } photometry by cross-matching the positions of known Galactic Cepheids to the recently released MIPSGAL point source catalog .
We have added 36 new sources featuring MIPSGAL photometry in our analysis , thus increasing the existing sample to 65 .
Six different sources of compiled Cepheid distances were used to establish a 24 \mu \mathrm { m } period-luminosity ( P-L ) relation .
Our recommended 24 \mu \mathrm { m } P-L relation is M _ { 24 \mu \mathrm { m } } = -3.18 ( \pm 0.10 ) \log P - 2.46 ( \pm 0.10 ) , with an estimated intrinsic dispersion of 0.20 mag , and is derived from 58 Cepheids exhibiting distances based on a calibrated Wesenheit function .
The slopes of the P-L relations were steepest when tied solely to the 10 Cepheids exhibiting trigonometric parallaxes from the Hubble Space Telescope and Hipparcos .
Statistical tests suggest that these P-L relations are significantly different from those associated with other methods of distance determination , and simulations indicate that difference may arise from the small sample size .