Star · M4V
ULAS J013939.77+004813.8
ULAS J013939.77+004813.8 is a main-sequence star of spectral type M4V in the constellation Cetus, 123.9 light-years from the Sun.
| Constellation | Cetus |
|---|---|
| Distance | 123.9 light-years (38.0 pc) |
| Apparent magnitude | magnitude 25.93 |
| Absolute magnitude | magnitude 23.03 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 9.63 × 10⁻⁷ L☉ |
| Radius | 0.00369 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 1h 39m 39.7s |
| Declination (J2000) | +0° 48′ 13″ |
| Space velocity (relative to the Sun) | 18.0 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 25.93. Visible from the whole Northern Hemisphere and south to latitude 89° S. It stands highest at midnight in October, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1902. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.2 million years.
The Sun seen from there
From a planet around ULAS J013939.77+004813.8, the Sun would look like a star of magnitude 7.73, in the direction where our sky has the constellation Virgo. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 7794 2.95 light-years
- HIP 7357 5.25 light-years
- HD 11505 9.33 light-years
- HIP 8972 9.85 light-years
- HIP 6653 9.99 light-years
- HIP 8998 11.1 light-years
- ULAS J013243.81+055232.2 12.2 light-years
- HIP 7860 13.4 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.