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We present \textit{Spitzer} full-orbit thermal phase curves of the hotJupiter Qatar-1b, a planet with the same equilibrium temperature---andintermediate surface gravity and orbital period---as the well-studied planetsHD 209458b and WASP-43b. We measure secondary eclipse of $0.21 \pm 0.02 \%$ at$3.6~\mu$m and $0.30 \pm 0.02 \%$ at $4.5~\mu$m, corresponding to daysidebrightness temperatures of $1542^{+32}_{-31}$~K and $1557^{+35}_{-36}$~K,respectively, consistent with a vertically isothermal dayside. The respectivenightside brightness temperatures are $1117^{+76}_{-71}$~K and$1167^{+69}_{-74}$~K, in line with a trend that hot Jupiters all have similarnightside temperatures. We infer a Bond albedo of $0.12_{-0.16}^{+0.14}$ and amoderate day-night heat recirculation efficiency, similar to HD 209458b.General circulation models for HD 209458b and WASP-43b predict that theirbright-spots should be shifted east of the substellar point by tens of degrees,and these predictions were previously confirmed with \textit{Spitzer}full-orbit phase curve observations. The phase curves of Qatar-1b are likewiseexpected to exhibit eastward offsets. Instead, the observed phase curves areconsistent with no offset: $11^{\circ}\pm 7^{\circ}$ at $3.6~\mu$m and$-4^{\circ}\pm 7^{\circ}$ at $4.5~\mu$m. The discrepancy in circulationpatterns between these three otherwise similar planets points to the importanceof secondary parameters like rotation rate and surface gravity, and thepresence or absence of clouds, in determining atmospheric conditions on hotJupiters.

Smaller than expected bright-spot offsets in Spitzer phase curves of the hot Jupiter Qatar-1b