Kruger 60 A
Star
Kruger 60 A - the brighter of a pair of red dwarfs 13.1 light-years away in Cepheus, circling each other every ~45 years. No planets are confirmed.
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Key facts
Mutual orbit
44.7 Earth years
16,316 Earth days
Mass
5.39 × 10²⁹ kg
0.271 M☉
Radius
243,495 km
35% of the Sun's radius
Surface temperature
3,180 K (2907 °C)
Luminosity
3.83 × 10²⁴ W
Spectral type
M3V (red dwarf)
Science
Physical
- Mass
- 5.39 × 10²⁹ kg · 0.271 M☉
- Radius
- 243,495 km · 35% of the Sun's radius
- Density
- 8,913 kg/m³ · 8.9× water
- Spectral type
- M3V (red dwarf)
Orbit (around the system barycenter)
- Semi-major axis
- 3.74 AU
- Eccentricity
- 0.41
- Orbital period
- 44.67 years
Composition
- By mass
- A red dwarf about 27% of the Sun's mass; the more massive of the pair.
Temperature
- Surface
- 3,180 K (2907 °C)
Radiation & temperature
- Luminosity
- 3.83 × 10²⁴ W · 0.01 L☉
- Surface temperature
- 3,180 K (2907 °C)
- Peak wavelength
- 911 nm · near-infrared (mostly invisible to the eye)
Discovery & history
- Discovered
- January 1, 1890
- By
- Adalbert Kruger
- Name
- Named for the German astronomer Adalbert Kruger and its number (60) in his catalogue; also GJ 860.
Recognised as a binary by Adalbert Kruger in the 1890s; its well-measured orbit has long made it a benchmark for red-dwarf masses.
Images
Images from open archives · credit shown per image