HD 20782
HD 20782 (HIP 15527; LTT 1582) is the primary of a wide binary system located in the southern constellation Fornax. It has an apparent magnitude of 7.38, making it readily visible in binoculars but not to the naked eye. The system is located relatively close at a distance of 117 light-years based on Gaia DR3 parallax measurements, but it is receding with a heliocentric radial velocity of 40.7 km/s. At its current distance, HD 20782's brightness is diminished by 0.12 magnitudes due to interstellar extinction and it has an absolute magnitude of +4.61.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Fornax |
| Right ascension | 03h 20m 03.57776s |
| Declination | −28° 51′ 14.6604″ |
| Apparent magnitude (V) | 7.38 |
| Characteristics | |
| Spectral type | G1.5 V |
| B−V color index | +0.65 |
| Astrometry | |
| Radial velocity (Rv) | 40.7±0.99 km/s |
| Proper motion (μ) | RA: +349.054 mas/yr Dec.: −65.305 mas/yr |
| Parallax (π) | 27.8760 ± 0.0172 mas |
| Distance | 117.00 ± 0.07 ly (35.87 ± 0.02 pc) |
| Absolute magnitude (MV) | +4.61 |
| Details | |
| Mass | 0.96+0.02 −0.01 M☉ |
| Radius | 1.17±0.03 R☉ |
| Luminosity | 1.262+0.005 −0.006 L☉ |
| Surface gravity (log g) | 4.35+0.05 −0.08 cgs |
| Temperature | 5,741±41 K |
| Metallicity [Fe/H] | −0.06±0.02 dex |
| Rotational velocity (v sin i) | 3.0±0.6 km/s |
| Age | 8.5+2.5 −2.0 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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