EF Eridani
EF Eridani (abbreviated EF Eri, sometimes incorrectly referred to as EF Eridanus) is a variable star of the type known as polars, AM Herculis stars, or magnetic cataclysmic variable stars. Historically it has varied between apparent magnitudes 14.5 and 17.3, although since 1995 it has generally remained at the lower limit. The star system consists of a white dwarf with a substellar-mass former star in orbit.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 03h 14m 13.25262s |
| Declination | −22° 35′ 42.9001″ |
| Apparent magnitude (V) | 14.5–17.3 |
| Characteristics | |
| Variable type | E+XM |
| Astrometry | |
| Radial velocity (Rv) | 70 km/s |
| Proper motion (μ) | RA: 137.993 mas/yr Dec.: -55.971 mas/yr |
| Parallax (π) | 6.2327 ± 0.1417 mas |
| Distance | 520 ± 10 ly (160 ± 4 pc) |
| Other designations | |
GSC 6439.00120, X 03116-227 | |
| Database references | |
| SIMBAD | data |
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