Struve 2398 B
Star
Struve 2398 B — the fainter red dwarf (M3.5V) of the Struve 2398 pair, about a quarter of the Sun's mass. It orbits its companion over many centuries and, like it, produces occasional flares. No planets are confirmed.
Open in 3D viewSee Struve 2398 B in the live, interactive 3D map
Key facts
Mutual orbit
~1,200 Earth years
Mass
4.93 × 10²⁹ kg
0.248 M☉
Radius
215,667 km
31% of the Sun's radius
Surface temperature
3,345 K (3072 °C)
Luminosity
3.02 × 10²⁴ W
Spectral type
M3.5V (red dwarf)
Science
Physical
- Mass
- 4.93 × 10²⁹ kg · 0.248 M☉
- Radius
- 215,667 km · 31% of the Sun's radius
- Density
- 11,739 kg/m³ · 12× water
- Spectral type
- M3.5V (red dwarf)
Orbit (around the system barycenter)
- Semi-major axis
- 36.2 AU
- Eccentricity
- 0.44
- Orbital period
- 1166.00 years
Composition
- By mass
- A red dwarf about a quarter of the Sun's mass — cooler and fainter than its companion. It too produces occasional flares.
Temperature
- Surface
- 3,345 K (3072 °C)
Radiation & temperature
- Luminosity
- 3.02 × 10²⁴ W · 0.0079 L☉
- Surface temperature
- 3,345 K (3072 °C)
- Peak wavelength
- 866 nm · near-infrared (mostly invisible to the eye)
Discovery & history
- Discovered
- January 1, 1822
- By
- F. G. W. von Struve
- Name
- 'Struve 2398 B' is the fainter component of the double star Σ 2398 (GJ 725).
Catalogued with its companion by F. G. W. von Struve around 1822. The two stars' shared motion across the sky marks them as a genuine bound pair.
Images
Images from open archives · credit shown per image