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We present a new stellar dynamical mass measurement ($M_\mathrm{BH}$) of thesupermassive black hole (SMBH) in NGC 1453, a fast-rotating massive ellipticalgalaxy in the MASSIVE survey. We measure stellar kinematics in 135 spatial binsin the central 1.5 kpc by 2 kpc region of the galaxy using high signal-to-noise($S/N \sim 130$) spectra from the Gemini-North GMOS integral-field spectrograph(IFS). Combining with wide-field IFS kinematics out to $\sim 3$ effective radiiand stellar light distributions from Hubble Space Telescope (HST) WFC3 images,we perform Schwarzschild orbit-based mass modeling in the axisymmetric limit toconstrain the mass components in NGC 1453. The best-fit black hole mass is$M_\mathrm{BH} =(2.9 \pm 0.4) 10^9 M_\odot$; the mass models without a centralblack hole are excluded at the $8.7\sigma$ level. The NGC 1453 black hole lieswithin the intrinsic scatter of the SMBH and galaxy scaling relations, unlikethree other galaxies hosting $\gtrsim 10^{10} M_\odot$ SMBHs in the MASSIVEsample. The high-$S/N$ GMOS spectra enable us to determine 8 moments of theGauss-Hermite expansion of the line-of-sight velocity distributions (LOSVDs),which are used as constraints in the orbit modeling. The stellar orbits in themass models are further constrained to produce negligible $h_9$ through$h_{12}$ to minimize spurious behavior in the LOSVDs. We show that truncatingthe series at $h_4$, as was often done in prior work, leads to a much weakerconstraint on the inferred $M_\mathrm{BH}$ for NGC 1453. Furthermore, wediscuss precautions and modifications that are needed to achieve axisymmetry intriaxial orbit codes that use the Schwarzschild method to sample the startspace of stellar orbits in triaxial gravitational potentials.

The MASSIVE Survey -- XV. A Stellar Dynamical Mass Measurement of the Supermassive Black Hole in Massive Elliptical Galaxy NGC 1453