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We present SCExAO/CHARIS high-contrast imaging/$JHK$ integral fieldspectroscopy of $\kappa$ And b, a directly-imaged low-mass companion orbiting anearby B9V star. We detect $\kappa$ And b at a high signal-to-noise and extracthigh precision spectrophotometry using a new forward-modeling algorithm for(A-)LOCI complementary to KLIP-FM developed by Pueyo (2016). $\kappa$ And b'sspectrum best resembles that of a low-gravity L0--L1 dwarf (L0--L1$\gamma$).Its spectrum and luminosity are very well matched by 2MASSJ0141-4633 andseveral other 12.5--15 $M_{\rm J}$ free floating members of the 40 $Myr$-oldTuc-Hor Association, consistent with a system age derived from recentinterferometric results for the primary, a companion mass at/near thedeuterium-burning limit (13$^{+12}_{-2}$ M$_{\rm J}$), and acompanion-to-primary mass ratio characteristic of other directly-imaged planets($q$ $\sim$ 0.005$^{+0.005}_{-0.001}$). We did not unambiguously identifyadditional, more closely-orbiting companions brighter and more massive than$\kappa$ And b down to $\rho$ $\sim$ 0.3" (15 au). SCExAO/CHARIS andcomplementary Keck/NIRC2 astrometric points reveal clockwise orbital motion.Modeling points towards a likely eccentric orbit: a subset of acceptable orbitsinclude those that are aligned with the star's rotation axis. However, $\kappa$And b's semimajor axis is plausibly larger than 75 au and in a region wheredisk instability could form massive companions. Deeper $\kappa$ Andhigh-contrast imaging and low-resolution spectroscopy from extreme AO systemslike SCExAO/CHARIS and higher resolution spectroscopy from Keck/OSIRIS or,later, IRIS on the Thirty Meter Telescope could help clarify $\kappa$ And b'schemistry and whether its spectrum provides an insight into its formationenvironment.

SCExAO/CHARIS Near-Infrared Direct Imaging, Spectroscopy, and Forward-Modeling of kappa And b: A Likely Young, Low-Gravity Superjovian Companion