Star · M7
GJ 3923
GJ 3923 is a main-sequence star of spectral type M7 in the constellation Corona Borealis, 60.3 light-years from the Sun.
| Constellation | Corona Borealis |
|---|---|
| Distance | 60.3 light-years (18.5 pc) |
| Apparent magnitude | magnitude 13.01 |
| Absolute magnitude | magnitude 11.68 |
| Spectral type | M7 |
| Surface temperature | 3,680 K |
| Luminosity | 0.00791 L☉ |
| Radius | 0.219 R☉ |
| Mass | 0.231 M☉ (estimated) |
| Right ascension (J2000) | 15h 51m 21.9s |
| Declination (J2000) | +29° 31′ 00″ |
| Space velocity (relative to the Sun) | 43.6 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.01. Visible from the whole Northern Hemisphere and south to latitude 60° S. North of latitude 60° N it never sets. 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 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 3923, the Sun would look like a star of magnitude 6.16, in the direction where our sky has the constellation Eridanus. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- Gl 607 3.71 light-years
- ρ CrB 5.44 light-years
- 2MASSW J1552591+294849 6.44 light-years
- η CrB 6.51 light-years
- η CrB 6.67 light-years
- GJ 3919 7.41 light-years
- GJ 3913 8.56 light-years
- WISEPA J162725.64+325525.5 8.84 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.