HD 41004
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pictor |
| Right ascension | 05h 59m 49.65018s |
| Declination | −48° 14′ 22.8883″ |
| Apparent magnitude (V) | 8.65 (8.82 + 12.51) |
| Characteristics | |
| Spectral type | K1V + M2V |
| B−V color index | 0.887±0.013 |
| Astrometry | |
| Radial velocity (Rv) | +42.36±0.14 km/s |
| Proper motion (μ) | RA: −43.418(115) mas/yr Dec.: +65.333(123) mas/yr |
| Parallax (π) | 25.6106±0.1043 mas |
| Distance | 127.4 ± 0.5 ly (39.0 ± 0.2 pc) |
| Absolute magnitude (MV) | 5.60 |
| Details | |
| A | |
| Mass | 0.89±0.07 M☉ |
| Radius | 1.04+0.02 −0.03 R☉ |
| Luminosity | 0.629±0.008 L☉ |
| Surface gravity (log g) | 4.34±0.11 cgs |
| Temperature | 5,255±52 K |
| Metallicity [Fe/H] | 0.15±0.03 dex |
| Rotational velocity (v sin i) | 1.0±1.2 km/s |
| B | |
| Mass | 0.4 M☉ |
| Other designations | |
| CD−48°2083, HD 41004, HIP 28393, SAO 217660, PPM 310291, WDS J05598-4814 | |
| Database references | |
| SIMBAD | data |
HD 41004 is a visual binary star system in the southern constellation of Pictor. It is too faint to be visible to the naked eye, having a combined apparent visual magnitude of 8.65. The two components have a magnitude difference of 3.7, and share a common proper motion with an angular separation of 0.30″, as of 2018. The distance to this system is approximately 127 light-years based on parallax. It is drifting further away from the Sun with a radial velocity of +42.5 km/s, having come to within 44.5 ly some 831,000 years ago.
The primary, component A, is a K-type main-sequence star with a stellar classification of K1V and a visual magnitude of 8.82. Torres et al. (2006) classed it as a K1IV star, suggesting it is a subgiant star that is evolving off the main sequence. It has 89% of the mass of the Sun and 104% of the Sun's radius. The star is radiating 63% of the Sun's luminosity from its photosphere at an effective temperature of 5,255 K. Its smaller companion, designated component B, is a red dwarf with spectral type M2V and apparent magnitude 12.33. It has a projected separation of 23 AU from the primary.