00h37m20.7196s, −24° 46′ 02.1843″| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 00h37m 20.7196s[1] |
| Declination | −24° 46′ 02.1843″[1] |
| Apparent magnitude (V) | 5.57[2] |
| Characteristics | |
| HD 3443A | |
| Evolutionary stage | main-sequence star |
| Spectral type | G9V[3] |
| Apparent magnitude (g) | 5.95[4] |
| HD 3443B | |
| Evolutionary stage | main-sequence star |
| Spectral type | K0.5V[3] |
| Astrometry | |
| Radial velocity (Rv) | 18.63[5] km/s |
| Proper motion (μ) | RA: 1450.34 mas/yr[1] Dec.: −19.38 mas/yr[1] |
| Parallax (π) | 64.93 ± 1.85 mas[3] |
| Distance | 50 ± 1 ly (15.4 ± 0.4 pc) |
| Absolute magnitude (MV) | 5.31±0.08[2] |
| Orbit[6] | |
| Primary | HD 3443A |
| Companion | HD 3443B |
| Period (P) | 25.09 y |
| Semi-major axis (a) | 0.4627[7]" (8.9 AU[8]) |
| Eccentricity (e) | 0.235 |
| Inclination (i) | 65.9[9]° |
| Semi-amplitude (K1) (primary) | 18.4 km/s |
| Details[9] | |
| HD 3443A | |
| Mass | 0.915±0.005[3] M☉ |
| Radius | 0.92±0.05 R☉ |
| Luminosity | 1.2[8] L☉ |
| Temperature | 5449[8] K |
| Metallicity [Fe/H] | −0.12[2] dex |
| Rotation | 32.6±4.89 d |
| Rotational velocity (v sin i) | 2.7±1.3 km/s |
| Age | 9.36[2] Gyr |
| HD 3443B | |
| Mass | 0.864±0.005[3] M☉ |
| Other designations | |
CD-25 225, CPD CPD-25 64, Gliese 25, HIP 2941, HR 159, 2MASS J00372057-2446023, WDS 00373–2446 | |
| HD 3443A: Gaia EDR3 2347260998051944448, TYC 6421-1924-1 | |
| HD 3443B: TYC 6421-1924-2 | |
| Database references | |
| SIMBAD | data |
HD 3443 is a binary system composed of medium-mass main sequence stars in the constellation of Cetus about 50 light years away.
This binary star system, with an orbital semimajor axis 8.9 AU, has not had any circumstellar dust detected as of 2020.[8] While the habitable zones of the stars stretch from 0.55 to 0.95 AU from the stars, planetary orbits with a semimajor axis beyond 1.87 AU would become unstable due to the influence of the binary companion.[10]
The star system is enriched in oxygen compared to the Solar System, having 140% of solar oxygen abundance,[11] but is depleted in heavier elements, having 75% of solar abundance of iron.[2]
