19450+4508 STF2579AB (Del Cyg)

Coord 2000	19450+4508		Discov num	STF2579		Comp	AB		Coord arcsec 2000	19 44 58.44 +45 07 50.5
Date first	1826		Date last	2016		Obs	483
Pa first	41		Pa last	217		P.A. Now (θ)	215.7°
Sep first	1.9		Sep last	2.7		Sep. Now (ρ)	2.76"
Mag pri	2.89		Mag sec	6.27		delta mag (ΔM)	3.38		Spectral class	B9.5IV (blue-white)
Pri motion ra	+051		Sec motion ra
Pri motion dec	+050		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	Del Cyg	48796	19450+4508	STF2579	AB	1826	2016	483	216	2.8	2.89	6.27	3.38	Y	<===
Show			19450+4508	STF2579	AC	1913	2017	8	67	62.5	2.89	12.00	9.11
Show			19450+4508	DAL 37	AD	1998	2007	3	246	42.0	2.89	14.80	11.91
Show			19450+4508	DAL 37	AF	1998	2007	3	66	147.5	2.89	12.80	9.91
Show			19450+4508	DAL 37	DE	1998	2015	4	251	3.5	14.80	15.20	0.40
Show			19450+4508	DAL 37	FG	2007	2015	2	312	3.1	13.00	13.80	0.80

Septuple system
7 visible stars in this system

Precise pa	216.7		Precise sep	2.68		Name	Del Cyg		Constellation	Cygnus
SAO	48796		HIP	97165		Tycho2	3557-02486-1		Gaia DR2	87999414656
HD	186882		HR	7528		GC	27347		ADS	12880
BD	BD+44 3234		Bayer	Delta Cygni		Bayer name	Del Cyg		Flamsteed	18 Cygni
Flamsteed name	18 Cyg		Distance	50.58		Distance ly	164.99		last precise pa	216.7
last precise sep	2.68

Period (P)	918.1y		Periastron (T)	1884.5y		Semi-major axis (a)	3.408a
Eccentricity (e)	0.52		Inclination (i)	146.9°		Longitude of periastron (ω)	129.7°
Node (Ω)	95.7°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2012

label rho theta 2000 2.599 224.3 2001 2.608 223.9 2002 2.617 223.4 2003 2.625 222.9 2004 2.634 222.4 2005 2.642 222.0 2006 2.650 221.5 2007 2.659 221.0 2008 2.667 220.6 2009 2.676 220.1 2010 2.684 219.7 2011 2.693 219.2 2012 2.701 218.8 2013 2.710 218.3 2014 2.718 217.9 2015 2.726 217.4 2016 2.735 217.0 2017 2.743 216.6 2018 2.752 216.1 2019 2.760 215.7 2020 2.768 215.3 2021 2.777 214.9 2022 2.785 214.4 2023 2.793 214.0 2024 2.802 213.6 2025 2.810 213.2 2026 2.818 212.8 2027 2.827 212.4 2028 2.835 212.0 2029 2.843 211.6 2030 2.852 211.2 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
19450+4508	STF2579	AB	2007	439	222	2.5	2.89	6.27	B9.5IV	NOD	194458.44+450750.5
19450+4508	STF2579	AB	2008	445	220	2.8	2.89	6.27	B9.5IV	NOD	194458.44+450750.5
19450+4508	STF2579	AB	2010	451	220	2.7	2.89	6.27	B9.5IV	NOD	194458.44+450750.5
19450+4508	STF2579	AB	2011	454	216	2.5	2.89	6.27	B9.5IV	NOD	194458.44+450750.5
19450+4508	STF2579	AB	2013	461	218	2.5	2.89	6.27	B9.5IV	NOD	194458.44+450750.5
19450+4508	STF2579	AB	2014	469	218	2.6	2.89	6.27	B9.5IV	NOD	194458.44+450750.5
19450+4508	STF2579	AB	2015	472	217	2.7	2.89	6.27	B9.5IV	NO	194458.44+450750.5
19450+4508	STF2579	AB	2016	481	215	2.7	2.89	6.27	B9.5IV	NO	194458.44+450750.5

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