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In this paper we report 23 magnetic field measurements of the B3IV star HD23478: 12 obtained from high resolution Stokes $V$ spectra using the ESPaDOnS(CFHT) and Narval (TBL) spectropolarimeters, and 11 from medium resolutionStokes $V$ spectra obtained with the DimaPol spectropolarimeter (DAO). HD 23478was one of two rapidly rotating stars identified as potential "centrifugalmagnetosphere" hosts based on IR observations from the Apache Point ObservatoryGalactic Evolution Experiment survey. We derive basic physical properties ofthis star including its mass ($M=6.1^{+0.8}_{-0.7}\,M_\odot$), effectivetemperature ($T_{\rm eff}=20\pm2\,$kK), radius($R=2.7^{+1.6}_{-0.9}\,R_\odot$), and age ($\tau_{\rm age}=3^{+37}_{-1}\,$Myr).We repeatedly detect weakly-variable Zeeman signatures in metal, He and H linesin all our observations corresponding to a longitudinal magnetic field of$\langle B_z\rangle\approx-2.0\,$kG. The rotational period is inferred fromHipparcos photometry ($P_{\rm rot}=1.0498(4)\,$d). Under the assumption of theOblique Rotator Model, our obsevations yield a surface dipole magnetic field ofstrength $B_d\geq9.5\,$kG that is approximately aligned with the stellarrotation axis. We confirm the presence of strong and broad H$\alpha$ emissionand gauge the volume of this star's centrifugal magnetosphere to be consistentwith those of other H$\alpha$ emitting centrifugal magnetosphere stars based onthe large inferred Alfv\'en to Kepler radius ratio.

Confirming HD 23478 as a new magnetic B star hosting an H$\alpha$-bright centrifugal magnetosphere