  We present a new space mission concept that is capable of finding, detecting,
and tracking 90% of near-Earth objects (NEO) with H magnitude of $\rm H\leq22$
(i.e., $\sim$140 m in size) that are potentially hazardous to the Earth. The
new mission concept relies on two emerging technologies: the technique of
synthetic tracking and the new generation of small and capable interplanetary
spacecraft. Synthetic tracking is a technique that de-streaks asteroid images
by taking multiple fast exposures. With synthetic tracking, an 800 sec
observation with a 10 cm telescope in space can detect a moving object with
apparent magnitude of 20.5 without losing sensitivity from streaking. We refer
to NEOs with a minimum orbit intersection distance of $< 0.002$ au as
Earth-grazers (EGs), representing typical albedo distributions. We show that a
constellation of six SmallSats (comparable in size to 9U CubeSats) equipped
with 10 cm synthetic tracking cameras and evenly-distributed in 1.0 au
heliocentric orbit could detect 90% of EGs with $\rm H \leq 22~mag$ in
$\sim$3.8 years of observing time. A more advanced constellation of nine 20 cm
telescopes could detect 90% of $\rm H=24.2~mag$ (i.e., $\rm \sim 50~m$ in size)
EGs in less than 5 years.
