Star · M4V
ULAS J161710.39+235031.4
ULAS J161710.39+235031.4 is a main-sequence star of spectral type M4V in the constellation Hercules, 137.0 light-years from the Sun.
| Constellation | Hercules |
|---|---|
| Distance | 137.0 light-years (42.0 pc) |
| Apparent magnitude | magnitude 25.22 |
| Absolute magnitude | magnitude 22.10 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 2.26 × 10⁻⁶ L☉ |
| Radius | 0.00566 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 16h 17m 10.5s |
| Declination (J2000) | +23° 50′ 31″ |
| Space velocity (relative to the Sun) | 30.8 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 25.22. Visible from the whole Northern Hemisphere and south to latitude 66° S. North of latitude 66° 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 1889. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.4 million years.
The Sun seen from there
From a planet around ULAS J161710.39+235031.4, the Sun would look like a star of magnitude 7.95, in the direction where our sky has the constellation Eridanus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 79594 9.75 light-years
- HIP 79720 10.6 light-years
- HIP 80096 11.3 light-years
- HIP 80876 12.5 light-years
- ULAS J160143.75+264623.4 12.9 light-years
- SDSS J161626.46+221859.2 13.6 light-years
- HIP 79327 13.9 light-years
- Kornephoros 14.7 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.