The Solar Neighborhood XLIV: RECONS Discoveries within 10 parsecs

We describe the 44 systems discovered to be within 10 parsecsof the Sun by the RECONS team, primarily via the long-term astrometryprogram at CTIO that began in 1999. The systems --- including 41 with red dwarfprimaries, 2 white dwarfs, and 1 brown dwarf--- have been found to have trigonometric parallaxesgreater than 100 milliarcseconds (mas), with errors of 0.4--2.4 mas in all but one case. We provide updated astrometric, photometric (VRIJHK magnitudes), spectral type, and multiplicity information here. Among these are 14 systems that are new entries to the 10 parsecsample based on parallaxesmeasured at the CTIO/SMARTS 0.9m telescope. These are the first parallaxesfor nine systems, while the remaining five systems had previously measured parallaxeswith errors greater than 10 mas or values placing them beyond 10 parsecs. We also present parallaxesfrom URAT for seven of these systems, providing additional evidence that they are closer than 10 parsecs. In addition, we provide new data for 22 systems that were previously known to lie within 10 parsecsand 9 systems reported to be closer than that horizon but for which new parallaxesplace them further away. In total, we provide data for 75 systems, for which 71 have new or updated parallaxeshere. The 44 systems added by RECONS comprise one of every seven systems known within 10 parsecs. We illustrate the evolution of the 10 parsecsample from the 191 systems known when the final Yale ParallaxCatalog (YPC) was published in 1995 to the 316 systems known today. Even so close to the Sun, additional discoveries of red and brown dwarfs(and perhaps even white dwarfs) are likely, both as primaries and secondaries, although we estimate that at least 90% of the stellar systems closer than 10 parsecshave now been identified.