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The Mission Accessible Near-Earth Object Survey (MANOS) aims to observe andcharacterize small (mean absolute magnitude H ~ 25 mag) Near-Earth Objects(NEOs) that are accessible by spacecraft (mean $\Delta v$ ~ 5.7 km/s) and thatmake close approaches with the Earth (mean Minimum Orbital IntersectionDistance MOID ~ 0.03 AU). We present here the first results of the MANOSvisible spectroscopic survey. The spectra were obtained from August 2013 toMarch 2018 at Lowell Observatory's Discovery Channel 4.3 meter telescope, andboth Gemini North and South facilities. In total, 210 NEOs have been observedand taxonomically classified. Our taxonomic distribution shows significantvariations with respect to surveys of larger objects. We suspect these to bedue to a dependence of Main Belt source regions on object size. Compared toprevious surveys of larger objects (Binzel et al. 2019, 2004; Perna et al.2018), we report a lower fraction of S+Q-complex asteroids of 43.8 $\pm$ 4.6%.We associate this decrease with a lack of Phocaea family members at very smallsize. We also report higher fractions of X-complex and A-type asteroids of 23.8$\pm$ 3.3% and 3.8 $\pm$ 1.3% respectively due to an increase of Hungariafamily objects at small size. We find a strong correlation between the Q/Sratio and perihelion distance. We suggest this correlation is due to planetaryclose encounters with Venus playing a major role in turning asteroids from S toQ-type. This hypothesis is supported by a similar correlation between the Q/Sratio and Venus MOID.

Visible spectroscopy from the Mission Accessible Near-Earth Object Survey (MANOS): Taxonomic dependence on asteroid size