Kruger 60
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h 27m 59.5s |
| Declination | +57° 41' 45" |
| Apparent magnitude (V) | 9.59/11.40 |
| Characteristics | |
| Spectral type | M3 V/M4 Ve |
| 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) | 248.06 ± 1.39 mas |
| Distance | 13.15 ± 0.07 ly (4.03 ± 0.02 pc) |
| Absolute magnitude (MV) | 11.76/13.37 |
| Details | |
| Mass | 0.27/0.16 M☉ |
| Radius | 0,33/0,23 Rs R☉ |
| Luminosity | 0.010/0.0034 L☉ |
| Temperature | 3180/2890 K K |
| Metallicity | ? |
| Rotation | ? |
| Age | ? years |
| Orbit | |
| Companion | Kruger 60 B |
| Period (P) | 44.67 yr |
| Semi-major axis (a) | 2.383″ |
| Eccentricity (e) | 0.41 |
| Inclination (i) | 167.2° |
| Longitude of the node (Ω) | 154.5° |
| Periastron epoch (T) | 1970.22 |
| Other designations | |
Kruger 60 is a binary star system composed of A and B components, both of which are red dwarf stars. These stars orbit each other every 44.6 years. The fainter companion B is a flare star and has been given the variable star designation "DO Cephei". It is an irregular flare that typically doubles in brightness and then returns to normal over an 8 minute period.
On average, the two stars are separated by 9.5 AUs, which is roughly the average distance of Saturn from the Sun. However, their eccenctric mutual orbit causes their distance to vary between 5.5 AUs at periastron, to 13.5 at apastron.
Reference
James Kaler, Extreme Stars, (Cambridge: Cambridge UP, 2001), p. 32.
See also
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