Star · M5
GJ 4019B
GJ 4019B is a main-sequence star of spectral type M5 in the constellation Hercules, 72.5 light-years from the Sun.
| Constellation | Hercules |
|---|---|
| Distance | 72.5 light-years (22.2 pc) |
| Apparent magnitude | magnitude 12.72 |
| Absolute magnitude | magnitude 10.99 |
| Spectral type | M5 |
| Surface temperature | 3,750 K |
| Luminosity | 0.0135 L☉ |
| Radius | 0.275 R☉ |
| Mass | 0.291 M☉ (estimated) |
| Right ascension (J2000) | 17h 39m 31.6s |
| Declination (J2000) | +27° 46′ 31″ |
| Space velocity (relative to the Sun) | 20.0 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.72. Visible from the whole Northern Hemisphere and south to latitude 62° S. North of latitude 62° N it never sets. It stands highest at midnight in June, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1954. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.3 million years.
The Sun seen from there
From a planet around GJ 4019B, the Sun would look like a star of magnitude 6.56, in the direction where our sky has the constellation Columba. 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.