20158+2749 CHR  94Aa,Ab

Coord 2000	20158+2749		Discov num	CHR  94		Comp	Aa,Ab		Coord arcsec 2000	20 15 46.16 +27 48 51.2
Date first	1985		Date last	2007		Obs	5
Pa first	90		Pa last	331		P.A. Now (θ)	213.5°
Sep first	0.1		Sep last	0.0		Sep. Now (ρ)	0.05"
Mag pri	4.80		Mag sec	6.50		delta mag (ΔM)	1.7		Spectral class	K3III (yellow-orange)
Pri motion ra	-034		Sec motion ra
Pri motion dec	+005		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		88428	20158+2749	CHR 94	Aa,Ab	1985	2007	5	214	0.0	4.80	6.50	1.70	Y	<===
Show	23 Vul	88428	20158+2749	MCA 60	AB	1980	2004	27	148	0.1	4.80	6.94	2.14

Triple system
2 visible stars in this system

Precise pa	330.7		Precise sep	0.047		Constellation	Vulpecula		SAO	88428
HIP	99874		Tycho2	2163-01794-1		Gaia DR2	16310522496		HD	192806
HR	7744		GC	28152		BD	BD+27 3666		Flamsteed	23 Vulpeculae
Flamsteed name	23 Vul		Distance	103.84		Distance ly	338.73		last precise pa	330.7
last precise sep	0.047

Period (P)	25.33y		Periastron (T)	2009.56y		Semi-major axis (a)	0.111a
Eccentricity (e)	0.4		Inclination (i)	71.5°		Longitude of periastron (ω)	293.8°
Node (Ω)	97.5°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2006

label rho theta 2000 0.110 259.9 2001 0.117 263.8 2002 0.121 267.4 2003 0.122 270.8 2004 0.118 274.3 2005 0.109 278.2 2006 0.094 283.2 2007 0.071 290.7 2008 0.041 308.0 2009 0.022 19.2 2010 0.046 76.5 2011 0.071 91.7 2012 0.083 100.2 2013 0.086 107.1 2014 0.082 114.3 2015 0.073 122.8 2016 0.063 133.9 2017 0.054 149.1 2018 0.047 169.5 2019 0.047 192.7 2020 0.053 213.5 2021 0.063 228.9 2022 0.075 239.8 2023 0.087 247.7 2024 0.098 253.7 2025 0.108 258.5 2026 0.115 262.6 2027 0.120 266.3 2028 0.122 269.7 2029 0.120 273.1 2030 0.113 276.9 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
20158+2749	CHR 94	Aa,Ab	1991	3	157	0.1	4.52		K3III	N	201546.16+274851.2
20158+2749	CHR 94	Aa,Ab	2006	4	107	0.1	4.52		K3III	N	201546.16+274851.2
20158+2749	CHR 94	Aa,Ab	2007	5	331	0.0	4.52		K3III	N D	201546.16+274851.2

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