Star · M4V
ULAS J123903.75+102518.6
ULAS J123903.75+102518.6 is a main-sequence star of spectral type M4V in the constellation Virgo, 394.7 light-years from the Sun.
| Constellation | Virgo |
|---|---|
| Distance | 394.7 light-years (121.0 pc) |
| Apparent magnitude | magnitude 26.00 |
| Absolute magnitude | magnitude 20.59 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 9.15 × 10⁻⁶ L☉ |
| Radius | 0.0114 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 12h 39m 03.8s |
| Declination (J2000) | +10° 25′ 20″ |
| Space velocity (relative to the Sun) | 131.0 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 26.00. 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 March, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1631. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 7.0 million years.
The Sun seen from there
From a planet around ULAS J123903.75+102518.6, the Sun would look like a star of magnitude 10.24, in the direction where our sky has the constellation Cetus. It would be invisible to the naked eye.
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.