  We compare the structures of the jets of the pre-planetary nebulae (PN)
CRL618 and the young stellar object (YSO) NGC 1333 IRAS4A2 and propose that in
both cases the jets are launched near periastron passages of a highly eccentric
binary system. The pre-PN CRL618 has two `twin-jets' on each side, where by
`twin-jets' we refer to a structure where one side is composed of two very
close and narrow jets that were launched at the same time. We analyze the
position-velocity diagram of NGC 1333 IRAS4A2, and find that it also has the
twin-jets structure. In both systems the orientation of the two twin-jets does
not change with time. By comparing these two seemingly different objects, we
speculate that the constant relative direction of the two twin-jets is fixed by
the direction of a highly eccentric orbit of a binary star. For example, a
double-arm spiral structure in the accretion disk induced by the companion
might lead to the launching of the twin-jets. We predict the presence of a
low-mass stelar companion in CRL618 that accretes mass and launches the jets,
and a substellar (a planet of a brown dwarf) companion to the YSO NGC 1333
IRAS4A2 that perturbed the accretion disk. In both cases the orbit has a high
eccentricity.
