Star · ?
GJ 3990
GJ 3990 is a main-sequence star of spectral type ? in the constellation Ophiuchus, 60.0 light-years from the Sun.
| Constellation | Ophiuchus |
|---|---|
| Distance | 60.0 light-years (18.4 pc) |
| Apparent magnitude | magnitude 13.99 |
| Absolute magnitude | magnitude 12.67 |
| Spectral type | ? |
| Surface temperature | 3,650 K |
| Luminosity | 0.00332 L☉ |
| Radius | 0.144 R☉ |
| Mass | 0.158 M☉ (estimated) |
| Right ascension (J2000) | 17h 09m 52.6s |
| Declination (J2000) | +11° 55′ 26″ |
| Space velocity (relative to the Sun) | 32.4 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.99. Visible from the whole Northern Hemisphere and south to latitude 78° S. North of latitude 78° 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 1966. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.1 million years.
The Sun seen from there
From a planet around GJ 3990, the Sun would look like a star of magnitude 6.15, in the direction where our sky has the constellation Lepus. It would be visible 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.