20181+4044 CHR  96Aa,Ab

Coord 2000	20181+4044		Discov num	CHR  96		Comp	Aa,Ab		Coord arcsec 2000	20 18 06.99 +40 43 55.6
Date first	1985		Date last	2018		Obs	30
Pa first	189		Pa last	151		P.A. Now (θ)	185°
Sep first	0.0		Sep last	0.1		Sep. Now (ρ)	0.05"
Mag pri	6.60		Mag sec	6.80		delta mag (ΔM)	0.2		Spectral class	O9IV (blue)
Pri motion ra	+001		Sec motion ra
Pri motion dec	-010		Sec motion dec
Notes	N O (See Notes, Orbital solution)

Visually invisible, K-band or other infrared star This double is physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		49438	20181+4044	CHR 96	Aa,Ab	1985	2018	30	185	0.0	6.60	6.80	0.20	Y	<===
Show		49438	20181+4044	STF2666	AB	1831	2018	86	245	2.8	5.96	8.24	2.28
Show		49438	20181+4044	STF2666	AC	1887	2006	13	207	34.0	5.96	10.70	4.74
Show		49438	20181+4044	TAR 5	AD	1887	2006	8	181	49.6	5.96	11.00	5.04
Show		49438	20181+4044	STF2666	CD	1892	2018	13	143	24.1	10.70	11.00	0.30

Quintuple system
4 visible stars in this system

Precise pa	150.5		Precise sep	0.067		Constellation	Cygnus		SAO	49438
HIP	100069		Tycho2	3155-02321-1		Gaia DR2	26011542272		HD	193322
HR	7767		ADS	13672		BD	BD+40 4103		Distance	595.24
Distance ly	1941.67		last precise pa	150.5		last precise sep	0.067

Period (P)	35.2y	± 1.45	Periastron (T)	1994.84y	± 1.69	Semi-major axis (a)	54.5m	± 3.7
Eccentricity (e)	0.489	± 0.081	Inclination (i)	46.2°	± 6.9	Longitude of periastron (ω)	70.4°	± 7.5
Node (Ω)	255.2°	± 15	Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2010

label rho theta 2000 0.050 75.8 2001 0.054 82.5 2002 0.058 88.3 2003 0.060 93.6 2004 0.062 98.5 2005 0.063 103.1 2006 0.064 107.7 2007 0.064 112.2 2008 0.064 116.7 2009 0.063 121.3 2010 0.062 125.9 2011 0.061 130.7 2012 0.060 135.7 2013 0.059 140.9 2014 0.057 146.3 2015 0.056 152.0 2016 0.055 158.0 2017 0.053 164.3 2018 0.052 170.9 2019 0.051 177.8 2020 0.050 185.0 2021 0.049 192.5 2022 0.048 200.3 2023 0.047 208.4 2024 0.046 217.0 2025 0.044 226.1 2026 0.042 236.0 2027 0.038 247.4 2028 0.033 261.6 2029 0.027 282.1 2030 0.021 316.2 Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

Period (P)	312.4d		Periastron (T)	50123.5d (1996.109y)		Semi-major axis (a)	3.9m	± 1.2
Eccentricity (e)	0		Inclination (i)	51°	± 34	Longitude of periastron (ω)	180°
Node (Ω)	25°	± 19	Note			Grade	8	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2010

label rho theta 2000-01-01 0.004 36.4 2001-01-01 0.003 97.2 2002-01-01 0.003 176.7 2003-01-01 0.004 218.2 2004-01-01 0.002 281.3 2005-01-01 0.003 359.0 2006-01-01 0.004 40.0 2007-01-01 0.002 105.4 2008-01-01 0.003 181.1 2009-01-01 0.004 221.9 2010-01-01 0.002 289.7 2011-01-01 0.004 3.2 2012-01-01 0.004 43.8 2013-01-01 0.002 113.9 2014-01-01 0.004 185.2 2015-01-01 0.004 225.8 2016-01-01 0.002 298.2 2017-01-01 0.004 7.1 2018-01-01 0.004 47.8 2019-01-01 0.002 122.4 2020-01-01 0.004 189.0 2021-01-01 0.003 229.9 2022-01-01 0.002 306.6 2023-01-01 0.004 10.9 2024-01-01 0.003 52.1 2025-01-01 0.003 130.7 2026-01-01 0.004 192.7 2027-01-01 0.003 234.4 2028-01-01 0.003 314.7 2029-01-01 0.004 14.5 2030-01-01 0.003 56.7 Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20181+4044	CHR 96	Aa,Ab	2008	8	117	0.1	5.80		O9V	NO	201806.99+404355.6
20181+4044	CHR 96	Aa,Ab	2010	24	130	0.1	5.80		O9V:((n))	NOD	201806.99+404355.6
20181+4044	CHR 96	Aa,Ab	2018	30	151	0.1	6.60	6.80	O9IV	NO	201806.99+404355.6

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