Star · M4V
ULAS J215700.47+005614.5
ULAS J215700.47+005614.5 is a main-sequence star of spectral type M4V in the constellation Aquarius, 225.1 light-years from the Sun.
| Constellation | Aquarius |
|---|---|
| Distance | 225.1 light-years (69.0 pc) |
| Apparent magnitude | magnitude 23.35 |
| Absolute magnitude | magnitude 19.16 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 3.42 × 10⁻⁵ L☉ |
| Radius | 0.022 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 21h 57m 00.5s |
| Declination (J2000) | +0° 56′ 15″ |
| Space velocity (relative to the Sun) | 49.7 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 23.35. Visible from the whole Northern Hemisphere and south to latitude 89° S. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1801. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.0 million years.
The Sun seen from there
From a planet around ULAS J215700.47+005614.5, the Sun would look like a star of magnitude 9.02, in the direction where our sky has the constellation Sextans. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 108342 7.17 light-years
- SDSS J215125.92-000200.7 7.61 light-years
- 32 Aqr 11.9 light-years
- HIP 108103 18.0 light-years
- HIP 108748 19.0 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.