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Doubles in session

Current system

20169+5017
ENG 73 AB
HD 193216

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Binocular doubles
Binary Systems
Triple Systems
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Neglected List I
Neglected List II
Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

20169+5017 ENG 73 AB (HD 193216)

20^h 16^m 54.53^s +50° 16' 43.4" P.A. 74.00 sep 81.4 mag 8.24,10.30 Sp G5 dist. 30.77 pc (100.37 l.y.)

Coord 2000	20169+5017		Discov num	ENG 73		Comp	AB		Coord arcsec 2000	20 16 54.53 +50 16 43.4
Date first	1892		Date last	2015		Obs	16
Pa first	96		Pa last	73.9		P.A. Now (θ)	73.9°
Sep first	54.5		Sep last	81.427		Sep. Now (ρ)	81.427"
Mag pri	8.24		Mag sec	10.30		delta mag (ΔM)	2.06		Spectral class	G5 (yellow)
Pri motion ra	-222		Sec motion ra	-022
Pri motion dec	-215		Sec motion dec	+004
Notes	N L W U (See Notes, Linear solution, , Proper motion indicates non-physical)

rPM=0.96

This double is not physical.

20169+5017 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	HD 193216		20 16 55 +50 16 43	ENG 73 AB	2015	16	74	81.4	8.24	10.30	2.06		<===
Show			20 16 55 +50 16 43	ENG 73 AC	2003	10	158	92.7	8.24	11.00	2.76
Show			20 16 55 +50 16 43	ENG 73 AD	2003	11	340	122.5	8.24	10.61	2.37
Show			20 16 55 +50 16 43	ENG 73 AE	2003	11	118	162.5	8.24	12.30	4.06
Show			20 16 55 +50 16 43	GIC 155 AF	2015	6	287	105.9	8.24	12.99	4.75
Show			20 16 55 +50 16 43	MET 89 AH	2003	1	67	4.2	6.40	18.60	12.20
Show			20 16 55 +50 16 43	MET 89 AI	2003	1	44	8.7	6.40	16.94	10.54
Show			20 16 55 +50 16 43	MET 89 AJ	2004	1	326	11.3	6.40	18.49	12.09
Show			20 16 55 +50 16 43	MET 89 AK	2003	1	232	11.7	6.40	18.41	12.01
Show			20 17 02 +50 17 03	BUP 243 BG	2015	10	193	10.5	10.30	11.04	0.74
Show			20 16 50 +50 18 38	BUP 243 DF	2015	15	216	105.9	10.61	12.99	2.38
Show			20 16 44 +50 17 14	RAO 70 FL	2015	4	266	15.1	12.99	16.40	3.41

12-fold system
12 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Name	HD 193216		Constellation	Cygnus		SAO	32429		HIP	99965
Tycho2	3580-00583-1		Gaia DR2	2085008267746614912		HD	193216		GC	28207
BD	BD+49 3245		Distance	30.77		Distance ly	100.37

ORBITAL ELEMENTS

Period (P)	418.77d		Periastron (T)	50218d (1996.368y)		Semi-major axis (a)	3.7m	± 0.8
Eccentricity (e)	0.084		Inclination (i)	124.9°	± 12.1	Longitude of periastron (ω)	243°
Node (Ω)	174.1°	± 8.6	Notes	n		Reference	Ren2013
Equinox	2000		Last observation			Grade	9	(1=Definitive, 9=Indet.)

label	theta	rho
2000-01-01	206.4	0.003
2001-01-01	281.2	0.002
2002-01-01	338.6	0.003
2003-01-01	8.5	0.003
2004-01-01	49.2	0.003
2005-01-01	114.1	0.003
2006-01-01	154.1	0.004
2007-01-01	179.5	0.004
2008-01-01	215.1	0.003
2009-01-01	296.0	0.002
2010-01-01	344.4	0.003
2011-01-01	14.1	0.003
2012-01-01	59.8	0.002
2013-01-01	123.5	0.003
2014-01-01	158.9	0.004
2015-01-01	184.2	0.004
2016-01-01	225.7	0.002
2017-01-01	308.5	0.002
2018-01-01	349.8	0.003
2019-01-01	20.1	0.003
2020-01-01	71.4	0.002
2021-01-01	131.7	0.003
2022-01-01	163.5	0.004
2023-01-01	189.3	0.003
2024-01-01	238.7	0.002
2025-01-01	318.7	0.003
2026-01-01	354.9	0.004
2027-01-01	26.7	0.003
2028-01-01	83.6	0.002
2029-01-01	138.8	0.003
2030-01-01	167.9	0.004
2031-01-01	194.9	0.003
2032-01-01	254.0	0.002
2033-01-01	327.2	0.003
2034-01-01	360.0	0.004
2035-01-01	34.2	0.003
2036-01-01	95.7	0.002
2037-01-01	145.1	0.003
2038-01-01	172.2	0.004
2039-01-01	201.4	0.003
2040-01-01	270.4	0.002
2041-01-01	334.4	0.003
2042-01-01	5.1	0.004
2043-01-01	42.8	0.003
2044-01-01	107.1	0.002
2045-01-01	150.7	0.003
2046-01-01	176.5	0.004
2047-01-01	209.1	0.003
2048-01-01	286.4	0.002
2049-01-01	340.7	0.003
2050-01-01	10.4	0.003

grafico orbita

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

wds20169%2B5017f.png orbit plot

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