Star · M4V
ULAS J101243.54+102101.7
ULAS J101243.54+102101.7 is a main-sequence star of spectral type M4V in the constellation Leo, 54.8 light-years from the Sun.
| Constellation | Leo |
|---|---|
| Distance | 54.8 light-years (16.8 pc) |
| Apparent magnitude | magnitude 24.38 |
| Absolute magnitude | magnitude 23.25 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 7.85 × 10⁻⁷ L☉ |
| Radius | 0.00333 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 10h 12m 43.8s |
| Declination (J2000) | +10° 21′ 05″ |
| Space velocity (relative to the Sun) | 53.4 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 24.38. Visible from the whole Northern Hemisphere and south to latitude 80° S. North of latitude 80° N it never sets. It stands highest at midnight in February, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1971. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 972 thousand years.
The Sun seen from there
From a planet around ULAS J101243.54+102101.7, the Sun would look like a star of magnitude 5.96, in the direction where our sky has the constellation Aquarius. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- GJ 3582 6.21 light-years
- SDSS J104335.08+121314.1 7.43 light-years
- ULAS J102940.52+093514.6 8.11 light-years
- Gl 398 8.67 light-years
- GJ 3598 8.85 light-years
- 2MASSI J1029216+162652 9.81 light-years
- GJ 2077 9.97 light-years
- CWISEP J093852.89+063440.6 10.2 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.