Star · M4V
SDSS J164245.38+191002.3
SDSS J164245.38+191002.3 is a main-sequence star of spectral type M4V in the constellation Hercules, 274.0 light-years from the Sun.
| Constellation | Hercules |
|---|---|
| Distance | 274.0 light-years (84.0 pc) |
| Apparent magnitude | magnitude 21.87 |
| Absolute magnitude | magnitude 17.25 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 1.98 × 10⁻⁴ L☉ |
| Radius | 0.053 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 16h 42m 45.4s |
| Declination (J2000) | +19° 10′ 03″ |
| Space velocity (relative to the Sun) | 18.6 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 21.87. Visible from the whole Northern Hemisphere and south to latitude 71° S. North of latitude 71° 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 1752. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.9 million years.
The Sun seen from there
From a planet around SDSS J164245.38+191002.3, the Sun would look like a star of magnitude 9.45, in the direction where our sky has the constellation Eridanus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 81068 12.5 light-years
- HIP 81011 16.9 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.