Furuhjelm 46

Gliese 661 is a nearby binary star system, consisting of two nearly equal red dwarfs, located in constellation Template:Constel.

Gliese 661 is the nearest «true» (i. e. not brown dwarf) star system in Template:Constel, however, there are two brown dwarfs in this constellation, located closer: WISE 1738+2732 and WISE 1741+2553.

Designations:

BD+45 2505 — possibly, earliest catalog, in which Gliese 661 presents.
HD 155876
AG+45 1333
KUI 79AB (KPR 79) (Kuiper, G. P. — discoverer of binarity, see 1934PASP...46..235K)
FUR 46AB (Furuhjelm 46)
Ci 20 1023 (Cincinnati observatory catalog of 1474 high proper motion stars, 1930)
G 203-51
PPM 56005
WDS J17121+4540AB
PLX 3907 (PLX 3907.00) (YPC, GCTP)
CCDM J17121+4540AB
HIC 84140, HIP 84140
TYC 3501-1952-1 (A)
UBV 13796, UBV 14565, UBV M 22001
CSI+45 2505 1 (CSI+45 2505 3 — A, CSI+45 2505 4 — B)
GCRV 9927
IDS 17092+4551 AB
GEN# +1.00155876J
IRAS 17106+4543
LSPM J1712+4539 ab
VVO 157 (VVO 345 — A)
JP11 2826
2MASS J17120780+4539587 (A)
GJ / Gl / Gliese 661
8pc 158.17
MCC 165 (A)
ASCC 336759 (A)
Zkh 242 (A), Zkh 243 (B)
LFT 1326 (A), LFT 1327 (B)
LTT 15095 (A), LTT 15096 (B)
LHS 433 (A), LHS 434 (B)
NLTT 44362 (A), NLTT 44363 (B)
[RHG95] 2717 (A), [RHG95] 2718 (B)
1C 74.01 (A)
USNO-B1.0 1356-00282048 (A)

Parallaxes:

153 ± 5 mas (Wooley et al. 1970)
159.5 ± 03.1 mas (GJ 3rd version, 1991)
154.0 ± 3.6 mas (YPC 4th edition, 1995) (Designation: PLX 3907.00)
158.17 ± 3.26 mas (Hipparcos, 1997) (Designation: Hip 84140)
156.66 ± 1.37 mas (Soederhjelm 1999, based on Hipparcos data)
167.29 ± 5.02 mas (Hipparcos 2nd reduction, van Leeuwen 2007; also Simbad)
158.17 ± 5.02 mas (XHIP, 2012 - parallax from Hipparcos 1997 (however, error of parallax is from van Leeuwen 2007))
156.32 ± 1.28 mas - the best distance estimate (RECONS TOP100, combined YPC and Soederhjelm parallaxes), yielding distance 6.40 ± 0.05 pc, or 20.86 ± 0.17 ly.

Proper motion (Simbad):

pm_RA = 348.59 ± 5.68 mas/yr
pm_DEC = -1624.84 ± 6.80 mas/yr

Radial velocity = -19 ± 5 km/s

Spectral types: M3 + M3.5 (GJ and YPC).

Apparent magnitude: 10.02 and 10.25.

Orbit:

Period = 12.9512 ± 0.0096 years
Semi-major axis = 0.7620 ± 0.0015 arcsec (on 6.40 pc (20.86 ly) it is 0.7620 * 6.40 = 4.8768 a. u.)
(Total system mass: 4.8768³ / 12.9512² = 0.691 Solar masses)
Inclination = 149.14 ± 0.25 °
Node = 160.0 ± 1.3 °
Time of periastron passage = 1991.032 ± 0.011 (fractional Besselian year)
Eccentricity = 0.7430 ± 0.008
Longitude of periastron = 99.0 ± 1.0 °
Equinox = 2000

Image of Orbit (WDS database)

Designations: WDS 17121+4540, KUI 79AB (Discoverer designation, possibly based on Kuiper, G. P., Two New Close M-Dwarf Binaries of Large Parallax, 1934PASP...46..235K - system's binarity discovery paper).

(Data from Sixth Catalog of Orbits of Visual Binary Stars, based on HARTKOPF W.I., MASON B.D. and McALISTER H.A., Binary star orbits from speckle interferometry. VIII. Orbits of 37 close visual systems, Astron. J., 111, 370-392 (1996) (1996AJ....111..370H))

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