Star · ?
GJ 3899
GJ 3899 is a white dwarf of spectral type ? in the constellation Serpens, 3,872 light-years from the Sun.
| Constellation | Serpens |
|---|---|
| Distance | 3,872 light-years (1,187 pc) |
| Apparent magnitude | magnitude 14.02 |
| Absolute magnitude | magnitude 3.65 |
| Spectral type | ? |
| Surface temperature | 8,000 K |
| Luminosity | 0.05 L☉ |
| Radius | 0.012 R☉ |
| Mass | 0.6 M☉ (estimated) |
| Right ascension (J2000) | 15h 17m 13.4s |
| Declination (J2000) | +3° 10′ 03″ |
| Space velocity (relative to the Sun) | 29.2 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 14.02. Visible from the whole Northern Hemisphere and south to latitude 87° S. It stands highest at midnight in May, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around 1847 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 69 million years.
The Sun seen from there
From a planet around GJ 3899, the Sun would look like a star of magnitude 15.20, in the direction where our sky has the constellation Eridanus. 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.