  The Y-dwarf WISE 1828+2650 is one of the coldest known Brown Dwarfs with an
effective temperature of $\sim$300 K. Located at a distance of just 10 pc,
previous model-based estimates suggest WISE1828+2650 has a mass of $\sim$5-10
Mj, making it a valuable laboratory for understanding the formation, evolution
and physical characteristics of gas giant planets. However, previous photometry
and spectroscopy have presented a puzzle with the near-impossibility of
simultaneously fitting both the short (0.9-2.0 microns) and long wavelength
(3-5 microns) data. A potential solution to this problem has been the
suggestion that WISE 1828+2650 is a binary system whose composite spectrum
might provide a better match to the data. Alternatively, new models being
developed to fit JWST/NIRSpec and MIRI spectroscopy might provide new insights.
This article describes JWST/NIRCam observations of WISE 1828+2650 in 6 filters
to address the binarity question and to provide new photometry to be used in
model fitting. We also report Adaptive Optics imaging with the Keck 10 m
telescope. We find no evidence for multiplicity for a companion beyond 0.5 AU
with either JWST or Keck. Companion articles will present low and high
resolution spectra of WISE 1828+2650 obtained with both NIRSpec and MIRI.
