  We present a new analysis of ${\it Spitzer}$ observations of comet
29P/Schwassmann-Wachmann 1 taken on UT 2003 November 21, 23, and 24, similar to
a previous investigation of the observations (Stansberry et al. 2004), but
using the most recent ${\it Spitzer}$ data pipeline products and intensive
image processing techniques. Analysis of images from the IRAC 5.8 & 8.0 $\mu$m
bands and the MIPS 24.0 & 70.0 $\mu$m bands resulted in photometry measurements
of the nucleus after a suite of coma modeling and removal processes were
implemented. SW1 was not identified in the 5.8 $\mu$m image from the previous
work so its incorporation into this analysis is entirely new. Using the Near
Earth Asteroid Thermal Model (Harris 1998) resulted in a nucleus radius
measurement of $R$ = 30.2 $^{+3.7}_{-2.9}$ km and an infrared beaming parameter
value of $\eta = 0.99$ $^{+0.26}_{-0.19}$. We also measured an infrared
geometric albedo, $p_{5.8}$ = 0.5 $\pm$ 0.5. Extrapolating a 0.04 V-band albedo
and using a normalized reflectivity gradient $S' = 14.94 \pm 1.09$ [% (1000
\r{A})$^{-1}$] (Duffard et al. 2014) we recover an infrared albedo of $p_{5.8}$
= 0.31 in the near infrared consistent with the value recovered from thermal
modeling. The dust composition extracted from IRS spectra are very comet-like,
containing mainly amorphous ferromagnesian silicates (but with a minority of
crystalline silicates as well), water ice, and metal sulfides.
