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The recent discovery of burst oscillation at 1122Hz in the X-ray transientXTE J1739-285 supports the suggestion that it contains a submillisecond pulsar.In our estimations of the enormous dissipation effect in the transitionboundary layer between quark matter core and hadron matter envelope, combingthe viscosities of bulk mater in previous works, we show that XTE J1739-285 canbe uniquely restricted to a quark star masquerading as a neutron star (hybridstar) that contains a pure quark matter or mixed quark-hadron matter core fromminimizing gravitational wave radiation (r-mode) instability and Keplerianmotion constraints at 1122Hz level through a three-parameters image. Suchconstraints allow the stellar radii in the range $9{\rm km}\leq R\leq 12{\rmkm}$ and the stellar masses in the range $1.2M_\odot\leq M\leq 2.0M_\odot$. Itperhaps implies that submillisecond pulsars are just probes of quark matter.

1122 Hz rotation of XTE J1739-285 as a probe of quark matter in the interior of the neutron star