19091+3436 CHR 84 Aa,Ab

19^h 09^m 04.35^s +34° 35' 59.9" P.A. 114.00 sep 0.1 mag 6.89,8.96 Sp G1V dist. 52.33 pc (170.7 l.y.)

Coord 2000	19091+3436		Discov num	CHR 84		Comp	Aa,Ab		Coord arcsec 2000	19 09 04.35 +34 35 59.9
Date first	1985		Date last	2014		Obs	36
Pa first	353		Pa last	113.8		P.A. Now (θ)	55.2°
Sep first	0.1		Sep last	0.061		Sep. Now (ρ)	0.083"
Mag pri	6.89		Mag sec	8.96		delta mag (ΔM)	2.07		Spectral class	G1V (yellow)
Pri motion ra	+056		Sec motion ra
Pri motion dec	+191		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

19091+3436 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		67879	19 09 04 +34 35 60	CHR 84 Aa,Ab	2014	36	114	0.1	6.89	8.96	2.07	Y	<===
Show	HD 178911	67879	19 09 04 +34 35 60	STF 2474 AB	2019	84	262	16.0	6.78	7.88	1.10
Show		67879	19 09 04 +34 35 60	WAL 105 AC	2017	5	126	97.5	6.78	11.42	4.64

Quadruple system
3 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Constellation	Lyra		SAO	67879		HIP	94076		Tycho2	2648-02148-1
Gaia DR2	2044341077844183040		HD	178911		HR	7272		ADS	12101
BD	BD+34 3439		Distance	52.33		Distance ly	170.7

ORBITAL ELEMENTS

Period (P)	1296.984d (3.55y)	± 0.355	Periastron (T)	50574.953m (1997.347y)	± 1.302	Semi-major axis (a)	0.074a	± 0.002
Eccentricity (e)	0.597	± 0.003	Inclination (i)	147.29°	± 0.99	Longitude of periastron (ω)	83.88°	± 0.87
Node (Ω)	276.91°	± 1.45	Notes	n		Reference	CIA2014a
Equinox	2000		Last observation	2012		Grade	1	(1=Definitive, 9=Indet.)

label	theta	rho
2000-01-01	336.9	0.084
2001-01-01	141.3	0.031
2002-01-01	40.6	0.093
2003-01-01	1.6	0.097
2004-01-01	306.0	0.063
2005-01-01	70.5	0.071
2006-01-01	22.6	0.099
2007-01-01	342.1	0.088
2008-01-01	194.2	0.025
2009-01-01	45.1	0.090
2010-01-01	5.6	0.098
2011-01-01	314.9	0.069
2012-01-01	78.8	0.064
2013-01-01	26.5	0.099
2014-01-01	346.9	0.090
2015-01-01	244.5	0.032
2016-01-01	50.0	0.087
2017-01-01	9.5	0.099
2018-01-01	322.3	0.074
2019-01-01	89.3	0.056
2020-01-01	30.5	0.098
2021-01-01	351.5	0.093
2022-01-01	272.6	0.043
2023-01-01	55.2	0.083
2024-01-01	13.4	0.100
2025-01-01	328.9	0.079
2026-01-01	103.9	0.046
2027-01-01	34.6	0.096
2028-01-01	355.8	0.095
2029-01-01	289.7	0.052
2030-01-01	61.0	0.079

grafico orbita

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

wds19091%2B3436b.png orbit plot

Measures: green=micrometric, blue=interferometric, purple=photographic