20312+1116 DA    1BC

Coord 2000	20312+1116		Discov num	DA    1		Comp	BC		Coord arcsec 2000	20 31 11.94 +11 15 33.7
Date first	1840		Date last	2006		Obs	97
Pa first	209		Pa last	179		P.A. Now (θ)	189.3°
Sep first	0.7		Sep last	0.2		Sep. Now (ρ)	0.36"
Mag pri	7.90		Mag sec	8.00		delta mag (ΔM)	0.1		Spectral class	Am (white)
Pri motion ra	-006		Sec motion ra	-006
Pri motion dec	-010		Sec motion dec	-010
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		106196	20312+1116	CHR 99	Aa,Ab	1983	2005	13	137	0.4	7.10
Show			20312+1116	STF2690	A,BC	1777	2018	158	256	17.7	7.12	7.39	0.27
Show			20312+1116	HJ 269	AD	1825	2016	17	108	23.0	7.12	12.10	4.98
Show			20312+1116	DA 1	BC	1840	2006	97	189	0.4	7.90	8.00	0.10	Y	<===

Quintuple system
5 visible stars in this system

Precise pa	178.5		Precise sep	0.202		Constellation	Delphinus		SAO	106195
HIP	101233		Tycho2	1095-01695-1		Gaia DR2	88501616128		HD	195482
ADS	13946		Distance	59.99		Distance ly	195.69		last precise pa	178.5
last precise sep	0.202

Period (P)	236.52y		Periastron (T)	1998.22y		Semi-major axis (a)	0.448a
Eccentricity (e)	0.875		Inclination (i)	68.6°		Longitude of periastron (ω)	237°
Node (Ω)	180.3°		Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2006

label rho theta 2000 0.049 151.3 2001 0.081 164.8 2002 0.111 170.7 2003 0.136 174.3 2004 0.159 176.8 2005 0.180 178.7 2006 0.199 180.2 2007 0.216 181.4 2008 0.233 182.5 2009 0.248 183.4 2010 0.262 184.3 2011 0.275 185.0 2012 0.288 185.7 2013 0.300 186.3 2014 0.311 186.9 2015 0.322 187.4 2016 0.332 187.9 2017 0.342 188.4 2018 0.351 188.9 2019 0.360 189.3 2020 0.369 189.7 2021 0.377 190.1 2022 0.385 190.5 2023 0.393 190.8 2024 0.400 191.2 2025 0.407 191.5 2026 0.414 191.8 2027 0.420 192.1 2028 0.426 192.4 2029 0.433 192.7 2030 0.438 193.0 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
20312+1116	DA 1	BC	2001	97	350	0.1	7.90	8.00		OD	203111.94+111533.7
20312+1116	DA 1	BC	2006	98	179	0.2	7.90	8.00		OD	203111.94+111533.7

If you need more information about this double, apply for a data request form to the WDS.