19550+4152 HO 581 (HD 188753)

19^h 54^m 58.40^s +41° 52' 17.6" P.A. 230.00 sep 0.1 mag 8.03,8.72 Sp G9V dist. 46.23 pc (150.8 l.y.)

Coord 2000	19550+4152		Discov num	HO 581		Comp			Coord arcsec 2000	19 54 58.40 +41 52 17.6
Date first	1895		Date last	2012		Obs	120
Pa first	258		Pa last	229.7		P.A. Now (θ)	75.7°
Sep first	0.3		Sep last	0.115		Sep. Now (ρ)	0.351"
Mag pri	8.03		Mag sec	8.72		delta mag (ΔM)	0.69		Spectral class	G9V (yellow)
Pri motion ra	-044		Sec motion ra
Pri motion dec	+293		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Name	HD 188753		Constellation	Cygnus		SAO	48968		HIP	98001
Tycho2	3145-00504-1		Gaia DR2	2075398256940805248		HD	188753		ADS	13125
BD	BD+41 3535		Distance	46.23		Distance ly	150.8

ORBITAL ELEMENTS

Period (P)	25.63y	± 0.04	Periastron (T)	1988.1y	± 0.1	Semi-major axis (a)	258.7m	± 2.8
Eccentricity (e)	0.502	± 0.008	Inclination (i)	31.1°	± 1.5	Longitude of periastron (ω)	233.8°	± 1.3
Node (Ω)	45.7°	± 1.1	Notes	n		Reference	XXX2018c
Equinox	2000		Last observation	2006		Grade	1	(1=Definitive, 9=Indet.)

label	theta	rho
2000	90.1	0.357
2001	95.7	0.353
2002	101.3	0.346
2003	107.3	0.337
2004	113.7	0.325
2005	120.6	0.311
2006	128.2	0.294
2007	136.7	0.276
2008	146.5	0.257
2009	158.0	0.236
2010	171.8	0.214
2011	188.9	0.190
2012	211.1	0.164
2013	242.5	0.135
2014	289.3	0.114
2015	338.2	0.132
2016	8.8	0.174
2017	27.1	0.218
2018	39.6	0.255
2019	49.1	0.286
2020	56.9	0.310
2021	63.7	0.328
2022	69.9	0.342
2023	75.7	0.351
2024	81.2	0.356
2025	86.7	0.357
2026	92.2	0.356
2027	97.7	0.351
2028	103.5	0.343
2029	109.6	0.332
2030	116.2	0.320

grafico orbita

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

wds19550%2B4152b.png orbit plot

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