Star · ?
GJ 4128
GJ 4128 is a main-sequence star of spectral type ? in the constellation Cygnus, 150.0 light-years from the Sun.
| Constellation | Cygnus |
|---|---|
| Distance | 150.0 light-years (46.0 pc) |
| Apparent magnitude | magnitude 12.43 |
| Absolute magnitude | magnitude 9.12 |
| Spectral type | ? |
| Surface temperature | 3,650 K |
| Luminosity | 0.0872 L☉ |
| Radius | 0.739 R☉ |
| Mass | 0.543 M☉ (estimated) |
| Right ascension (J2000) | 19h 54m 02.8s |
| Declination (J2000) | +32° 33′ 47″ |
| Space velocity (relative to the Sun) | 51.5 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.43. Visible from the whole Northern Hemisphere and south to latitude 57° S. North of latitude 57° N it never sets. It stands highest at midnight in July, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1876. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.7 million years.
The Sun seen from there
From a planet around GJ 4128, the Sun would look like a star of magnitude 8.14, in the direction where our sky has the constellation Puppis. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.