Furuhjelm 46
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Template:Constel |
| Right ascension | 10h 56m 28.99s |
| Declination | +07° 00′ 52.0″ |
| 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) | 167.29 ± 5.02 mas |
| Distance | 19.5 ± 0.6 ly (6.0 ± 0.2 pc) |
| Orbit[1] | |
| 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[2] |
| Argument of periastron (ω) (secondary) | 99.0 ± 1.0° |
| Details | |
| Temperature | 3,272 ± 28[3] K |
| Metallicity [Fe/H] | –0.31 ± 0.17[3] dex |
| Other designations | |
BD+45 2505, HD 155876 | |
| Gl 661 A: LFT 1326, LTT 15095, LHS 433, NLTT 44362 | |
| Gl 661 B: LFT 1327, LTT 15096, LHS 434, NLTT 44363 | |
Gliese 661 is a nearby binary star system, consisting of two very similar red dwarfs, located in the constellation Template:Constel.
Gliese 661 is the nearest "true" (i. e. not brown dwarf) star system in Template:Constel, however, there is brown dwarf in this constellation, located closer: WISE 1741+2553.
References
- ^ 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.
- ^ a b Rojas-Ayala, Bárbara; et al. (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.
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