HS 0728+6738 is a deeply eclipsing nova‑like cataclysmic variable of the SW Sextantis class, first identified in the Hamburg Quasar Survey. In this close binary, a white dwarf accretes material from its companion via a stable accretion disk. The system’s orbital period is 3.21 hours, and its inclination is ≈ 85°, making it the highest‑inclination SW Sex star known. Its optical and far‑ultraviolet emission lines remain largely unobscured during eclipses, and the light curve shows rapid variability with a period of about 7 minutes, likely linked to the white dwarf’s spin
Photometry & Images
| Catalogue | Gaia |
| RA | 113.422634402° |
| DEC | 67.537639222° |
| U | -- |
| B | -- |
| V | -- |
| Parallax (mas) | 1.76 ± 0.04 |
TESS Data
AAVSO Data
Spectroscopy
