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PSR~J1618$-$3921 is an $11.99$-ms pulsar in a $22.7$-d orbit around a likelylow-mass He white dwarf companion, discovered in a survey of the intermediateGalactic latitudes at 1400 MHz conducted with the Parkes radio telescope in thelate 1990s. Although PSR~J1618$-$3921 was discovered more than 15 years ago,only limited information has been published about this pulsar which has asurprisingly large orbital eccentricity ($e \simeq 0.027$), considering itshigh spin frequency and likely small companion mass. The focus of this work isa precise measurement of the spin, astrometric and orbital characteristics ofPSR J1618$-$3921. This was done with timing observations made at the Nan\c{c}ayRadio Telescope, from 2009 to 2017. We analyzed the timing data recorded at theNan\c{c}ay Radio Telescope over several years to characterize the properties ofPSR~J1618$-$3921. A rotation ephemeris for this pulsar was obtained byanalyzing the times of arrival of the radio pulses at the telescope. We confirmthe unusual eccentricity of PSR~J1618$-$3921 and discuss several hypothesesregarding its formation, in the context of other discoveries of recycledpulsars in eccentric orbits.

PSR J1618-3921: a recycled pulsar in an eccentric orbit