20306+1349 HDS2932

Coord 2000	20306+1349		Discov num	HDS2932		Comp			Coord arcsec 2000	20 30 33.47 +13 49 02.4
Date first	1991		Date last	2019		Obs	10
Pa first	325		Pa last	319		P.A. Now (θ)	326.5°
Sep first	0.1		Sep last	0.2		Sep. Now (ρ)	0.16"
Mag pri	8.61		Mag sec	9.23		delta mag (ΔM)	0.62		Spectral class	F8 (yellow-white)
Pri motion ra	+011		Sec motion ra
Pri motion dec	-014		Sec motion dec
Notes	O (Orbital solution)

Visually invisible, K-band or other infrared star This double is physical.

Precise pa	319.3		Precise sep	0.157		Constellation	Delphinus		SAO	106180
HIP	101181		Tycho2	1099-01401-1		Gaia DR2	57532613632		HD	195397
BD	BD+13 4415		Distance	91.24		Distance ly	297.62		last precise pa	319.3
last precise sep	0.157

Period (P)	26.1y	± 0.6	Periastron (T)	2006.12y	± 0.09	Semi-major axis (a)	122.4m	± 3.9
Eccentricity (e)	0.829	± 0.011	Inclination (i)	66.9°	± 1.6	Longitude of periastron (ω)	309.5°	± 2.5
Node (Ω)	170.5°	± 2	Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2008

label rho theta 2000 0.156 336.7 2001 0.148 338.7 2002 0.136 341.0 2003 0.119 343.7 2004 0.096 347.7 2005 0.061 355.1 2006 0.009 102.9 2007 0.033 203.5 2008 0.036 242.9 2009 0.047 270.3 2010 0.060 286.5 2011 0.075 296.6 2012 0.088 303.5 2013 0.102 308.5 2014 0.114 312.5 2015 0.125 315.7 2016 0.134 318.4 2017 0.143 320.7 2018 0.151 322.8 2019 0.157 324.7 2020 0.162 326.5 2021 0.165 328.2 2022 0.167 329.9 2023 0.167 331.5 2024 0.166 333.1 2025 0.163 334.8 2026 0.157 336.6 2027 0.149 338.5 2028 0.137 340.7 2029 0.121 343.4 2030 0.098 347.2 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
20306+1349	HDS2932		1997	2	330	0.2	8.61	9.23	F8		203033.47+134902.4
20306+1349	HDS2932		2004	3	357	0.1	8.61	9.23	F8		203033.47+134902.4
20306+1349	HDS2932		2008	6	259	0.0	8.61	9.23	F8	D	203033.47+134902.4
20306+1349	HDS2932		2015	7	309	0.1	8.61	9.23	F8	O	203033.47+134902.4
20306+1349	HDS2932		2017	8	316	0.1	8.61	9.23	F8	O	203033.47+134902.4
20306+1349	HDS2932		2018	9	317	0.1	8.61	9.23	F8	O	203033.47+134902.4
20306+1349	HDS2932		2019	10	319	0.2	8.61	9.23	F8	O	203033.47+134902.4

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