Eta1 Pictoris
η1 Pictoris, Latinised as Eta1 Pictoris, is a solitary star in the southern constellation of Pictor. It is faintly visible to the naked eye with an apparent visual magnitude of +5.37. Based upon an annual parallax shift of 38.35 mas as seen from the Earth, the system is located 85 light years from the Sun. The star made its closest approach to the Sun about 1.1 million years ago with a perihelion passage of about 24 ly (7.5 pc).
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pictor |
| Right ascension | 05h 02m 48.68641s |
| Declination | −49° 09′ 05.0644″ |
| Apparent magnitude (V) | +5.37 |
| Characteristics | |
| Spectral type | F5 V |
| U−B color index | −0.01 |
| B−V color index | +0.43 |
| Astrometry | |
| Radial velocity (Rv) | 21.4±2.8 km/s |
| Proper motion (μ) | RA: −43.67 mas/yr Dec.: +27.37 mas/yr |
| Parallax (π) | 38.35 ± 0.18 mas |
| Distance | 85.0 ± 0.4 ly (26.1 ± 0.1 pc) |
| Absolute magnitude (MV) | 3.28 |
| Details | |
| Mass | 1.37 M☉ |
| Radius | 1.1 R☉ |
| Luminosity | 3.69 L☉ |
| Surface gravity (log g) | 4.17 cgs |
| Temperature | 6,631±225 K |
| Metallicity [Fe/H] | −0.05 dex |
| Rotational velocity (v sin i) | 22.7±1.1 km/s |
| Age | 2.15 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an F-type main sequence star with a stellar classification of F5 V and it is chromospherically active. It is an estimated 2.15 billion years old and is spinning with a projected rotational velocity of 22.7 km/s. The star has 1.4 times the mass of the Sun and about 1.1 times the Sun's radius. It is radiating 3.7 times the Sun's luminosity from its photosphere at an effective temperature of roughly 6,631 K.