In this paper , we study the anisotropy of cosmic acceleration the using Pantheon sample , which includes 1048 spectroscopically confirmed Type Ia supernovae ( SNe Ia ) covering the redshift range 0.01 < z < 2.3 .
In hemisphere comparison method , we find the dipole direction is ( l = 37 \pm 40 ^ { \circ } ,b = 33 \pm 16 ^ { \circ } ) with the maximum anisotropy level of \delta = 0.136 { } ^ { +0.009 } _ { -0.005 } .
From the dipole fitting method , we find that the magnitude of anisotropy is A = ( 3.7 { } ^ { +2.5 } _ { -3.7 } ) \times 10 ^ { -4 } , and the direction of the dipole ( l = 329 ^ { \circ } { } ^ { +101 ^ { \circ } } _ { -28 ^ { \circ } } ,b = 37 ^ { \circ } { } ^ { +52 ^ { \circ } } _ { -2 % 1 ^ { \circ } } ) in the galactic coordinate system .
The result is weakly dependent on redshift from the redshift tomography analysis .
The anisotropy is small and the isotropic cosmological model is an excellent approximation .