Star · M4V
SDSS J154050.74+503324.4
SDSS J154050.74+503324.4 is a main-sequence star of spectral type M4V in the constellation Boötes, 401.2 light-years from the Sun.
| Constellation | Boötes |
|---|---|
| Distance | 401.2 light-years (123.0 pc) |
| Apparent magnitude | magnitude 22.16 |
| Absolute magnitude | magnitude 16.71 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 3.25 × 10⁻⁴ L☉ |
| Radius | 0.0679 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 15h 40m 50.7s |
| Declination (J2000) | +50° 33′ 24″ |
| Space velocity (relative to the Sun) | 35.4 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 22.16. Visible from the whole Northern Hemisphere and south to latitude 39° S. North of latitude 39° 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 1625. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 7.1 million years.
The Sun seen from there
From a planet around SDSS J154050.74+503324.4, the Sun would look like a star of magnitude 10.28, in the direction where our sky has the constellation Horologium. 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.