Star · G8V
GJ 4138
GJ 4138 is a main-sequence star of spectral type G8V in the constellation Cygnus, 79.8 light-years from the Sun.
| Constellation | Cygnus |
|---|---|
| Distance | 79.8 light-years (24.5 pc) |
| Apparent magnitude | magnitude 7.95 |
| Absolute magnitude | magnitude 6.01 |
| Spectral type | G8V |
| Surface temperature | 5,110 K |
| Luminosity | 0.445 L☉ |
| Radius | 0.852 R☉ |
| Mass | 0.817 M☉ (estimated) |
| Right ascension (J2000) | 20h 11m 25.1s |
| Declination (J2000) | +38° 24′ 01″ |
| Space velocity (relative to the Sun) | 18.4 km/s |
In the sky
Too faint for the naked eye (magnitude 7.95); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 52° S. North of latitude 52° 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 1946. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.4 million years.
The Sun seen from there
From a planet around GJ 4138, the Sun would look like a star of magnitude 6.77, 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.