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| mpc_name = (16974) Iphthime
| alt_names = {{mp|1998 WR|21}}{{·}}1974 WX<br />1986 WS
| pronounced =
| pronounced = {{IPAc-en|ɪ|f|'|θ|aɪ|m|iː}}<ref>Noah Webster (1884) ''A Practical Dictionary of the English Language''</ref>
| named_after = [[Iphthime|Ἰφθῑμη]] ''Iphthīmē <ref name="MPC-object" /><br />{{small|(Greek mythology)}}
| mp_category = [[Jupiter trojan]] <ref name="MPC-object" /><ref name="jpldata" /><br />{{nowrap|[[Greek camp|Greek]] <ref name="MPC-Jupiter-Trojans" />{{·}}[[Background asteroid|background]] <ref name="AstDys-object" />}}
| orbit_ref =  <ref name="jpldata" />
}}
'''16974 Iphthime''', provisional designation ''{{IPAc-enmp|ɪ|f1998 WR|'|θ|aɪ|m|iː21}}'', is a [[Jupiter trojan]] and a [[Binary asteroid|binary system]] from the [[Greek camp]], approximately {{convert|57|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 18 November 1998, by astronomers with the [[Lincoln Near-Earth Asteroid Research]] at the [[Lincoln Laboratory's Experimental Test Site|ETS Test Site]] in Socorro, New Mexico.<ref name="MPC-object" /> The dark Jovian [[asteroid]] belongs to the [[#Largest Jupiter trojans|80 largest Jupiter trojans]] and has a notably slow [[Rotation period|rotation]] of 78.9 hours.<ref name="lcdb" /> It was named after [[Iphthime]] from Greek mythology.<ref name="MPC-object" /> The discovery of its [[Minor-planet moon|companion]] by Hubble Space Telescope was announced in March 2016.
== Orbit and classification ==
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