Furuhjelm 46
| 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[1] mas |
| Distance | 20.8 ± 0.2 ly (6.38 ± 0.06 pc) |
| Orbit[2] | |
| 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[3] |
| Argument of periastron (ω) (secondary) | 99.0 ± 1.0° |
| Details | |
| Temperature | 3,272 ± 28[4] K |
| Metallicity [Fe/H] | –0.31 ± 0.17[4] 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, 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.
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.
See also
Furuhjelm 46 at the SIMBAD Astronomical Database.
- Ids - Bibliography - Siblings - Image - B&W Image.
References
- ↑ Söderhjelm, Staffan (1999). "HIP 84140". Visual binary orbits and masses post Hipparcos.
- ↑ From the Sixth Catalog of Orbits of Visual Binary Stars, based upon Hartkopf, W. I.; Mason, B. D.; McAlister, H. A. (1996), "Binary star orbits from speckle interferometry. VIII. Orbits of 37 close visual systems", Astronomical Journal 111: 370–392, Bibcode:1996AJ....111..370H, doi:10.1086/117790
- ↑ Fractional Besselian year.
- 1 2 Rojas-Ayala, Bárbara; et al. (April 2012). "Metallicity and Temperature Indicators in M Dwarf K-band Spectra: Testing New and Updated Calibrations with Observations of 133 Solar Neighborhood M Dwarfs". The Astrophysical Journal 748 (2): 93. arXiv:1112.4567. Bibcode:2012ApJ...748...93R. doi:10.1088/0004-637X/748/2/93.
External links
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