Star · K9V
SDSS J155438.45+193906.7
SDSS J155438.45+193906.7 is a main-sequence star of spectral type K9V in the constellation Serpens, 250.9 light-years from the Sun.
| Constellation | Serpens |
|---|---|
| Distance | 250.9 light-years (76.9 pc) |
| Apparent magnitude | magnitude 21.34 |
| Absolute magnitude | magnitude 16.91 |
| Spectral type | K9V |
| Surface temperature | 3,740 K |
| Luminosity | 5.84 × 10⁻⁵ L☉ |
| Radius | 0.0182 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 15h 54m 38.4s |
| Declination (J2000) | +19° 39′ 05″ |
| Space velocity (relative to the Sun) | 54.0 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 21.34. Visible from the whole Northern Hemisphere and south to latitude 70° S. North of latitude 70° 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 1775. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.5 million years.
The Sun seen from there
From a planet around SDSS J155438.45+193906.7, the Sun would look like a star of magnitude 9.26, 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 77247 9.17 light-years
- HIP 78067 13.7 light-years
- SDSS J160140.86+215945.4 13.9 light-years
- 2MASSI J1600054+170832 13.9 light-years
- HIP 76926 14.7 light-years
- HIP 77868 16.5 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.