[6] A detailed follow-up study of the new rare type of variable showed that it was 17' from the centre of M33, on the outskirts of the galaxy near one of the spiral arms.

[7] A spectroscopic study near minimum brightness in 2003 confirmed the LBV nature of Romano's Star and showed that the spectral type was Of/WN.

[8] Analysis of historical records show that Romano's Star was likely quiescent from 1900 until five outbursts occurred between 1960 and 2010.

The brightness is not constant during maximum but shows variations on a timescale of months.

[2] The minimum brightness in 2014 was the faintest ever recorded at below magnitude 18.7 and the star remained faint into 2016.

The radius also changes from about 22.5 R☉ at minimum to 61 R☉ at maximum, so that the star is much larger and cooler when it is visually brightest.