Star · M4V
SDSS J164540.16+290744.4
SDSS J164540.16+290744.4 is a main-sequence star of spectral type M4V in the constellation Hercules, 329.4 light-years from the Sun.
| Constellation | Hercules |
|---|---|
| Distance | 329.4 light-years (101.0 pc) |
| Apparent magnitude | magnitude 22.10 |
| Absolute magnitude | magnitude 17.08 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 2.32 × 10⁻⁴ L☉ |
| Radius | 0.0573 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 16h 45m 40.2s |
| Declination (J2000) | +29° 07′ 44″ |
| Space velocity (relative to the Sun) | 14.4 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 22.10. Visible from the whole Northern Hemisphere and south to latitude 61° S. North of latitude 61° 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 1697. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 5.8 million years.
The Sun seen from there
From a planet around SDSS J164540.16+290744.4, the Sun would look like a star of magnitude 9.85, in the direction where our sky has the constellation Eridanus. 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.