Furuhjelm 46
Furuhjelm 46, also known as HD 155876 and Gliese 661, is a nearby binary star system, consisting of two very similar red dwarfs, located in the constellation Hercules.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 17h 12m 07.91s |
| Declination | +45° 39′ 57.2″ |
| Apparent magnitude (V) | 10.02/10.25 |
| Characteristics | |
| Spectral type | M3 + M3.5 |
| Astrometry | |
| Radial velocity (Rv) | –19 ± 5 km/s |
| Proper motion (μ) | RA: +348.59 ± 5.68 mas/yr Dec.: –1624.84 ± 6.80 mas/yr |
| Parallax (π) | 156.66 ± 1.37 mas |
| Distance | 20.8 ± 0.2 ly (6.38 ± 0.06 pc) |
| Orbit | |
| Period (P) | 12.9512 ± 0.0096 yr |
| Semi-major axis (a) | 0.7620 ± 0.0015″ |
| Eccentricity (e) | 0.7430 ± 0.008 |
| Inclination (i) | 149.14 ± 0.25° |
| Longitude of the node (Ω) | 160.0 ± 1.3° |
| Periastron epoch (T) | 1991.032 ± 0.011 |
| Argument of periastron (ω) (secondary) | 99.0 ± 1.0° |
| Details | |
| Temperature | 3,272 ± 28 K |
| Metallicity [Fe/H] | –0.31 ± 0.17 dex |
| Other designations | |
| Gl 661 A: LFT 1326, LTT 15095, LHS 433, NLTT 44362 | |
| Gl 661 B: LFT 1327, LTT 15096, LHS 434, NLTT 44363 | |
| Database references | |
| SIMBAD | The system |
| A | |
| B | |
Furuhjelm 46 Location of Furuhjelm 46 in the constellation Hercules | |
The star's duplicity was discovered by the Dutch astronomer Gerard Kuiper in 1934 in a systematic survey for duplicity of the known stars within about 25 parsecs from the Sun, carried out with the 36-inch telescope of the Lick Observatory. Furuhjelm 46 is the nearest "true" (i. e. not brown dwarf) star system in Hercules, however, there is brown dwarf in this constellation, located closer: WISE 1741+2553.
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