Star · M2.5 V
USco1621 A
USco1621 A is a main-sequence star of spectral type M2.5 V in the constellation Scorpius, 449.8 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Scorpius |
|---|---|
| Distance | 449.8 light-years (137.9 pc) |
| Apparent magnitude | magnitude 15.54 |
| Absolute magnitude | magnitude 9.84 |
| Spectral type | M2.5 V |
| Surface temperature | 3,460 K |
| Luminosity | 0.0955 L☉ |
| Radius | 0.71 R☉ |
| Mass | 0.36 M☉ |
| Age | 0.0 billion years |
| Right ascension (J2000) | 16h 21m 29.5s |
| Declination (J2000) | −25° 29′ 44″ |
| Space velocity (relative to the Sun) | 17.2 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 15.54. Visible from the whole Southern Hemisphere and north to latitude 65° N. South of latitude 65° S 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 1576. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 8.0 million years.
The Sun seen from there
From a planet around USco1621 A, the Sun would look like a star of magnitude 10.53, in the direction where our sky has the constellation Taurus. It would be invisible to the naked eye.
Planets
- USco1621 b 12.2 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.