*Herschel* observations requires an understanding of the binary configuration, which we address first. Typically, the important orbital elements in fitting binary orbits are the semi-major axis, eccentricity, and period, which yield physical characteristics of the system (if the distance is known). Regular observations of 99 Her date back to 1859 and the binary has completed nearly three revolutions since being discovered. Additional observations since the previous orbital derivation , have allowed us to derive an updated orbit. Aside from a change of 180$^\circ$ in the ascending node [based on spectroscopic data @2006ApJS..162..207A], the orbital parameters have changed little; the main purpose of re-deriving the orbit is to quantify the uncertainties.

The orbit was derived by fitting position angles (PAs) and separations ($\rho$) from the Washington Double Star catalogue [@2011yCat....102026M].[^3] We included three additional observations; a *Hubble Space Telescope* (HST) *Imaging Spectrograph* (STIS) acquisition image [epoch 2000.84, $PA=264 \pm
2^\circ$, $\rho=0.54 \pm 0.02$”, @2004ApJ...606..306B], an adaptive optics image taken using the Lick Observatory Shane 3m telescope with the IRCAL near-IR camera as an ongoing search for faint companions of stars in the UNS sample (epoch 2009.41, $PA=309 \pm
2^\circ$, $\rho=1.12 \pm 0.02$”), and a Keck II NIRC2 L’ speckle image taken 