32 Eridani
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 03h 54m 17.50181s |
| Declination | −02° 57′ 17.0397″ |
| Apparent magnitude (V) | 4.45 |
| Observation data Epoch J2000 Equinox J2000 | |
| Constellation | Eridanus |
| 32 Eridani A | |
| Right ascension | 03h 54m 17.50s |
| Declination | −02° 57′ 17.0″ |
| Apparent magnitude (V) | 4.79 |
| 32 Eridani B | |
| Right ascension | 03h 54m 17.41s |
| Declination | −02° 57′ 10.3″ |
| Apparent magnitude (V) | 6.14 |
| Characteristics | |
| 32 Eridani A | |
| Evolutionary stage | giant star |
| Spectral type | G8III |
| 32 Eridani B | |
| Evolutionary stage | main sequence |
| Spectral type | A1V |
| Astrometry | |
| A | |
| Proper motion (μ) | RA: +26.330 mas/yr Dec.: +0.079 mas/yr |
| Parallax (π) | 9.4562±0.1108 mas |
| Distance | 345 ± 4 ly (106 ± 1 pc) |
| B | |
| Proper motion (μ) | RA: +26.878 mas/yr Dec.: +1.007 mas/yr |
| Parallax (π) | 9.6777±0.0623 mas |
| Distance | 337 ± 2 ly (103.3 ± 0.7 pc) |
| Position (relative to 32 Eridani A) | |
| Component | 32 Eridani B |
| Epoch of observation | 2021 |
| Angular distance | 6.90″ |
| Position angle | 349° |
| Details | |
| 32 Eridani A | |
| Mass | 1.29 M☉ |
| Radius | 14.6 R☉ |
| Luminosity | 138 L☉ |
| Surface gravity (log g) | 2.63 cgs |
| Temperature | 4,970 K |
| Metallicity [Fe/H] | −0.16 dex |
| Rotational velocity (v sin i) | 2.7 km/s |
| Age | 706 Myr |
| 32 Eridani B | |
| Mass | 2.36 M☉ |
| Radius | 2.32 R☉ |
| Luminosity | 36 L☉ |
| Temperature | 9,294 K |
| Rotational velocity (v sin i) | 180 km/s |
| Age | 461 Myr |
| Other designations | |
| 32 Eri, HIP 18255 | |
| 32 Eridani A: HD 24555, HR 1212 | |
| 32 Eridani B: HD 24554, HR 1211 | |
| Database references | |
| SIMBAD | data |
| A | |
| B | |
32 Eridani (abbreviated 32 Eri) is a binary star in the constellation of Eridanus. The two stars are designated HD 24555 (32 Eridani A) and HD 24554 (32 Eridani B). They share a single entry in the Hipparcos catalogue, HIP 18255, but have separate entries in the Bright Star Catalogue, HR 1212 and HR 1211.
32 Eridani is visible to the naked eye as a single star with an apparent magnitude of 4.45. Individually, 32 Eridani A shines at magnitude 4.79 while 32 Eridani B has a magnitude of 6.14. As of 2021, the pair had an angular separation of about 6.90 arcseconds with a position angle of 349°.
Based on measurements of parallax by the Gaia mission, the system lies at a distance of about 340 light-years (22,000,000 AU) from Earth.
The primary component, 32 Eridani A, is an evolved yellow giant star of spectral type G8III. It has a radius about 15 times that of the Sun and a luminosity around 138 times solar, with an effective temperature of about 4,970 K.
The secondary component, 32 Eridani B, is a main-sequence star of spectral type A1V. It has a surface temperature of roughly 9,294 K and rotates rapidly with a projected rotational velocity of about 180 km/s, giving the star a noticeably flattened shape due to its rotation.