We report the results of a 60-hr photometric campaign of a rapidly oscillating Ap star , J0855 ( TYC 2488-1241-1 ) .
We have utilised the multi-site Las Cumbres Observatory ’ s ( LCO ) 0.4-m telescopes to obtain short cadence B - band observations of an roAp star previously lacking detailed study .
Our observations confirm the rotation period presented in the discovery paper of this star ( P _ { rot } = 3.0918 d ) , and reveal the star to be pulsating in a distorted mode .
The B data show this star to be among the highest amplitude roAp stars , with a peak-to-peak amplitude of 24 mmag .
Modelling of the pulsation frequency at 197.2714 d ^ { -1 } ( 2283 \muup Hz ; P = 7.30 min ) shows that this star belongs to the subgroup of super-critical pulsators , where the observed frequencies are above the theoretical acoustic cutoff frequency .
From the modelling , we deduce that the star ’ s rotation axis is inclination angle of about 30 ^ { \circ } to the line-of-sight , with an angle of obliquity of the magnetic axis to the rotation axis of either 40 ^ { \circ } or 24 ^ { \circ } depending on whether the pulsation mode is dipole or quadrupole , respectively .