Authors: C. Kay (JHU APL), A. Vourlidas (JHU APL), L. Balmaceda (NASA GSFC/GMU)

Coronal Mass Ejections (CMEs) routinely propagate away from the Sun throughout interplanetary space. The mass of the CME is a key parameter in determining how a CME evolves and interacts with the background solar wind, but accurate CME masses are not routinely measured. We combine the CORSET catalog (Vourlidas et al. 2017, Balmaceda et al. 2018), which identified regions corresponding to CMEs in coronal images, with a method for converting excess white light brightness into mass per pixel to create a new catalog of CME masses. This catalog spans from 2007-2015 when both STEREO satellites were available for stereoscopic reconstructions. We first determine a projected mass for every region in the CORSET catalog, yielding reconstructions at multiple times and multiple perspectives for most CMEs. For the subset of events with paired CORSET regions from both STEREO A and B we determine a deprojected CME mass and direction. Given a CME longitude, we can determine the separation from the center of mass and the plane-of-the-sky and use this to convert the projected mass to a “true” mass. By assuming the true mass must be the same regardless of viewpoint, we can combine the multiple perspectives to infer the “true” longitude, as done in Colaninno & Vourlidas 2009. Additionally, we consider a revised technique where we assume the deprojected height and latitude should also be the same from both perspectives. We compare our results with GCS CME reconstructions from LLAMACoRe (Kay & Palmerio 2024) and find that our mostly automated deprojection techniques yield results comparable to those determined by manual GCS reconstructions.