Kruger 60

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Kruger 60 A/B
Observation data
Epoch J2000      Equinox
Constellation Cepheus
Kruger 60 A
Right ascension 22h 27m 59.4677s[1]
Declination +57° 41′ 45.150″[1]
Apparent magnitude (V) 9.59
Kruger 60 B
Right ascension 22h 27m 59.568s[1]
Declination +57° 41′ 45.28″[1]
Apparent magnitude (V) 11.40
Characteristics
Spectral type M3V/M4V[2]
U−B color index 1.27/1.3
B−V color index 1.65/1.8
Variable type None/Flare star
Astrometry
Radial velocity (Rv) –33.1/–31.9 km/s
Proper motion (μ) RA: –870.23 mas/yr
Dec.: –471.10 mas/yr
Parallax (π) 247.5 ± 1.5[3] mas
Distance 13.18 ± 0.08 ly
(4.04 ± 0.02 pc)
Absolute magnitude (MV) 11.76/13.46
Details
Mass 0.271/0.176[4] M☉
Radius 0.35/0.24[5] R☉
Luminosity 0.010/0.0034 L☉
Temperature 3180/2890 K K
Metallicity –0.04[6]
Orbit[7]
Primary Kruger 60 A
Companion Kruger 60 B
Period (P) 44.67 yr
Semi-major axis (a) 2.383"
Eccentricity (e) 0.410
Inclination (i) 167.2°
Longitude of the node (Ω) 154.5°
Periastron epoch (T) 1970.22
Argument of periastron (ω)
(primary)		 211.0°
Other designations
DO Cephei, G 232-075, GJ 860 A/B, BD +56°2783, HD 239960, LHS 3814/3815, GCTP 5438.00, ADS 15972, Vys 207 A/B, HIP 110893.[8]
Database references
SIMBAD The system
A
B

Kruger 60 (DO Cephei) is a binary star system located 13.15 light-years from the Sun. These red dwarf stars orbit each other every 44.6 years.

The larger, primary star is designated component A, while the secondary, smaller star is labeled component B. Component A has about 27% of the Sun's mass and 35% of the Sun's radius. Component B has about 18% of the Sun's mass and 24% of the Sun's radius.[4][5] Component B is a flare star and has been given the variable star designation "DO Cephei".[9] It is an irregular flare that typically doubles in brightness and then returns to normal over an 8-minute period.[citation needed]

On average, the two stars are separated by 9.5 AUs, which is roughly the average distance of Saturn from the Sun. However, their eccentric mutual orbit causes their distance to vary between 5.5 AUs at periastron, to 13.5 at apastron.[citation needed]

This system is orbiting through the Milky Way at a distance from the core that varies from 7–9 kpc with an orbital eccentricity of 0.126–0.130.[10] The closest approach to the Sun will occur in about 88,600 years when this system will come within 1.95 parsecs.[11]

References

  1. ↑ 1.0 1.1 1.2 1.3 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found. The data is from the Vizier II/224 catalogue.
  6. ↑ Lua error in package.lua at line 80: module 'strict' not found. Only listed for component A.
  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  10. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  11. ↑ Lua error in package.lua at line 80: module 'strict' not found.

Notes

Further reading

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