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The Daytime Sextantids meteor shower, part of the Phaethon-Geminid StreamComplex (PGC), is closely related to the Geminids, currently the strongestmeteor shower visible at the Earth. The DSX share a similar orbit to asteroid2005 UD, but the nature of the association remains unclear. From optical datawe find that DSX meteors ablate similarly to Geminids, suggesting that they arealso high density and consistent with a common origin. From radar data we haveisolated 19,007 DSX orbits through application of a novel convex hull approachto determine stream membership. We find at the peak the mean semi-major axis isnear 1 AU, eccentricity is 0.86 and that both decrease as a function of solarlongitude. The inclination averages 25 degrees at the peak but increases overtime. Noticeable DSX activity extends from solar longitude 173-196$^{\circ}$with a flux plateau between 186 - 189$^{\circ}$. The peak flux is $2 \pm 0.05\times 10^{-3}$ km$^{-2}$ hr$^{-1}$, equivalent to a ZHR of 20. We estimate atrue differential mass index for the shower of $s = 1.64 \pm 0.06$ at the timeof peak and an average of $1.70 \pm 0.07$ for days surrounding the peak. Themass of the DSX stream is estimated to be $10^{16}$ g, the same order as 2005UD, suggesting the stream is too massive to have been created by recentmeteoroid production from 2005 UD. We propose that the DSX and 2005 UD werecreated in the same break-up event that created 3200 Phaethon.

Characterizing the Daytime Sextantids Meteor Shower and Unveiling the Nature of the Phaethon-Geminid Stream Complex