@1977AJ.....82..776O also measured a strong millimetre emission (1.53Jy at 90GHz)[^1] and defined it as a BL Lac object. Since then it was continuously monitored in radio and optical . performed extensive studies on the radio and optical behaviour and the broad-band SED of this source. It remarkably shows high polarization variability, from 7% to 30% . It is classified as an ISP BL Lac object using different approaches and datasets to calculate the location of its synchrotron peak.

Since the launch of the *Fermi* satellite in 2008, the source has been listed in most of the *Fermi*-LAT catalogues, i.e. 1FGL [@2010ApJS..188..405A]; 2FGL [@2012ApJS..199...31N]; 1FHL [@2013ApJS..209...34A]; and 3FGL [@2015ApJS..218...23A]. However, the source is not listed in the catalogue of sources detected $>50\,\text{GeV}$ by the *Fermi*-LAT [2FHL, @2016ApJS..222....5A]. The source is variable in the high energy (HE: 100 MeV$<E<$100 GeV) gamma-ray band with the variability index equal to 489 and the maximum monthly flux value of $F_{(0.1-100\,\text{GeV})}=(2.14\pm0.17) \times 10^{-7}$phcm$^{-2}$s$^{-1}$ which is reported in February 2011 [3FGL, @2015ApJS..218...23A]. @2008ApJS..175...97H reported a redshift value for the source of $z=0.265$, which was disfavoured by @2016MNRAS.458.2836P using a high signal-to-noise optical spectrum from Gran Telescopio Canarias. Based on this spectrum, $z>0.35$ was measured, assuming the source 