Star · M4
Struve 2398 B
Struve 2398 B is a main-sequence star of spectral type M4 in the constellation Draco, 11.5 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Other names | Gl 725 B · Gl 725B · HIP 91772 |
|---|---|
| Constellation | Draco |
| Distance | 11.5 light-years (3.52 pc) |
| Apparent magnitude | magnitude 9.70 |
| Absolute magnitude | magnitude 11.97 |
| Spectral type | M4 |
| Surface temperature | 3,380 K |
| Luminosity | 0.00916 L☉ |
| Radius | 0.28 R☉ |
| Mass | 0.25 M☉ |
| Age | 8.7 billion years |
| Metallicity [Fe/H] | -0.28 |
| Right ascension (J2000) | 18h 42m 47.7s |
| Declination (J2000) | +59° 37′ 39″ |
| Space velocity (relative to the Sun) | 39.0 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 9.70. Visible from the whole Northern Hemisphere and south to latitude 30° S. North of latitude 30° N it never sets. It stands highest at midnight in June, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 2015. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 204 thousand years.
The Sun seen from there
From a planet around Struve 2398 B, the Sun would look like a star of magnitude 2.56, in the direction where our sky has the constellation Pictor. It would be visible to the naked eye.
Planets
- Gl 725 B c 37.9-day orbit · 1.66 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.