Star · G5
GJ 3557
GJ 3557 is a giant star of spectral type G5 in the constellation Leo, 442.6 light-years from the Sun.
| Other names | HIP 46415 |
|---|---|
| Constellation | Leo |
| Distance | 442.6 light-years (135.7 pc) |
| Apparent magnitude | magnitude 7.79 |
| Absolute magnitude | magnitude 2.13 |
| Spectral type | G5 |
| Surface temperature | 5,180 K |
| Luminosity | 15.4 L☉ |
| Radius | 4.87 R☉ |
| Mass | 1.98 M☉ (estimated) |
| Right ascension (J2000) | 9h 27m 55.5s |
| Declination (J2000) | +13° 44′ 56″ |
| Space velocity (relative to the Sun) | 139.7 km/s |
In the sky
Too faint for the naked eye (magnitude 7.79); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 76° S. North of latitude 76° N it never sets. It stands highest at midnight in February, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1583. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 7.9 million years.
The Sun seen from there
From a planet around GJ 3557, the Sun would look like a star of magnitude 10.49, in the direction where our sky has the constellation Capricornus. It would be invisible to the naked eye.
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.