19394+3009 MCA  57 (Phi Cyg)

Coord 2000	19394+3009		Discov num	MCA  57		Comp			Coord arcsec 2000	19 39 22.60 +30 09 11.6
Date first	1978		Date last	1994		Obs	52
Pa first	81		Pa last	247		P.A. Now (θ)	247°
Sep first	0.0		Sep last	0.0		Sep. Now (ρ)	0"
Mag pri	4.90		Mag sec	5.10		delta mag (ΔM)	0.2		Spectral class	G8III-IV (yellow)
Pri motion ra	+004		Sec motion ra
Pri motion dec	+037		Sec motion dec
Notes	N O R (See Notes, Orbital solution, Red magnitudes)

This double is physical.

Precise pa	246.8		Precise sep	0.03		Name	Phi Cyg		Constellation	Cygnus
SAO	68637		HIP	96683		HD	185734		HR	7478
GC	27203		Bayer	Phi Cygni		Bayer name	Phi Cyg		Flamsteed	12 Cygni
Flamsteed name	12 Cyg		Distance	81.63		Distance ly	266.28		last precise pa	246.8
last precise sep	0.03

Period (P)	434.171d	± 0.015	Periastron (T)	28230.76d (1936.169y)	± 0.62	Semi-major axis (a)	26.9m	± 0.75
Eccentricity (e)	0.542	± 0.0063	Inclination (i)	80.8°	± 0.63	Longitude of periastron (ω)	34°	± 1.3
Node (Ω)	251°	± 0.86	Note			Grade	1	(1=Definitive, 9=Indet.)
Equinox			Last observation

label rho theta 2000-01-01 0.018 87.2 2001-01-01 0.032 78.4 2002-01-01 0.038 74.0 2003-01-01 0.031 69.6 2004-01-01 0.005 43.4 2005-01-01 0.010 234.4 2006-01-01 0.013 94.2 2007-01-01 0.029 80.1 2008-01-01 0.037 75.2 2009-01-01 0.035 71.1 2010-01-01 0.016 62.4 2011-01-01 0.013 246.3 2012-01-01 0.007 111.8 2013-01-01 0.025 82.4 2014-01-01 0.036 76.4 2015-01-01 0.037 72.4 2016-01-01 0.024 66.7 2017-01-01 0.011 256.6 2018-01-01 0.004 174.4 2019-01-01 0.020 85.7 2020-01-01 0.033 77.8 2021-01-01 0.038 73.6 2022-01-01 0.030 69.0 2023-01-01 0.002 354.1 2024-01-01 0.008 227.2 2025-01-01 0.015 91.2 2026-01-01 0.030 79.5 2027-01-01 0.038 74.8 2028-01-01 0.034 70.6 2029-01-01 0.012 59.4 2030-01-01 0.013 242.9 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
19394+3009	MCA 57		1994	52	67	0.0	4.70		G8III-IV	NO	193922.60+300911.6

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