Photovisual and spectroscopic observations of HBV 475 in the range λλ 3800–11 000 Å by means of S-20 and S-1 Carnegie Intensifies and prismatic cameras (dispersion 60 A/mm at Hγ), made in 1969 through 1971, have revealed the simultaneous presence of hot and cold sources of radiation, both variable.

In 1969 when the magnitudes were B = 12.45, V = 12.05, U = 11.40 the hot source gave origin to a quite strong ultraviolet continuum and to emission lines among which the most intense are due to: HI (H16 to Hα and P14 to P7); OI 8446; Fell (mult. 27, 37, 38, 42, 48, 49); [NII] 5755; Hel (4471, 5876, 6678, 7065, 10 830 very strong); [OIII] (5007, 4959, 4363); [NeIII] (3869, 3968); Hell 4686 weak.