  The spectra of the planetary nebula NGC2392 is reanalysed using spectral
measurements made in the mid-infrared with the Spitzer Space Telescope. The aim
is to determine the chemical composition of this object. We also make use of
IUE and ground based spectra. Abundances determined from the mid-infrared
lines, which are insensitive to electron temperature, are used as the basis for
the determination of the composition, which are found to differ somewhat from
earlier results. The abundances found, especially the low value of helium and
oxygen, indicate that the central star was originally of rather low mass.
Abundances of phosphorus, iron, silicon and chlorine have been determined for
the first time in this nebula. The variation of electron temperature in this
nebula is very clear reaching quite high values close to the center. The
temperature of the central star is discussed in the light of the high observed
stages of ionization. The nebular information indicates the spectrum of the
star deviates considerably from a blackbody.
