Mu Herculis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 17h 46m 27.5s |
| Declination | +27° 43′ 14″ |
| Apparent magnitude (V) | 3.42/10.35/10.80 |
| Characteristics | |
| Spectral type | G5 IV/M3.5 V/M4 V |
| U−B color index | 0.39/1.01 |
| B−V color index | 0.75/1.50 |
| Variable type | Periodic |
| Astrometry | |
| Radial velocity (Rv) | -16.1/-13.7 km/s |
| Proper motion (μ) | RA: -291.42/-77.62 mas/yr Dec.: -750.00/-270.12 mas/yr |
| Parallax (π) | 119.02 ± 0.58 mas |
| Distance | 27.4 ± 0.1 ly (8.40 ± 0.04 pc) |
| Absolute magnitude (MV) | 3.80/10.73/11.18 |
| Details | |
| Mass | 1.1/0.31/0.31 M☉ |
| Radius | 1.8/0.48/0.4 R☉ |
| Luminosity | 2.2-2.7/0.005/0.003 L☉ |
| Temperature | 5,500 K |
| Metallicity | 130-300% |
| Rotation | 20 km/s. |
| Age | ? years |
| Other designations | |
Mu Herculis is a nearest star system about 27.4 light years from Earth in the constellation Hercules. Its main star, Mu Herculis A (possibly a binary) is fairly similar to the Sun although more highly evolved. Its mass is about 1.1 times that of the Sun, and it is beginning to expand to become a giant. Mu Herculis A and the binary itself pair B-C are separated by 286 AUs. On the other hand stars B-C are separated by 11.4 AUs. Their orbit is quite elliptic (e=0.18) and both stars swing each other between 9.4 and 13.5 AUs.
Mu Herculis Ab (or D)?
Star A is itself suspected to be a close binary with a low mass stellar or a large substellar companion, probably at 17.2 AUs in elliptic orbit (e=0.34). Nevertheless the existence of such an object has still not confirmed
External links
- Mu Hercules4 at SolStation.
- Mu Herculis by Professor Jim Kaler.
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