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Current system

19531-1436
CHR 90
V505 Sgr

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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

19531-1436 CHR 90 (V505 Sgr)

19^h 53^m 06.39^s -14° 36' 11.1" P.A. 182.70 sep 0.4 mag 9.25,6.61 Sp A2V+G5IV dist. 119.05 pc (388.34 l.y.)

Coord 2000	19531-1436		Discov num	CHR 90		Comp			Coord arcsec 2000	19 53 06.39 -14 36 11.1
Date first	1985		Date last	2018		Obs	26
Pa first	190		Pa last	186		P.A. Now (θ)	182.7°
Sep first	0.3		Sep last	0.4		Sep. Now (ρ)	0.42"
Mag pri	9.25		Mag sec	6.61		delta mag (ΔM)	2.64		Spectral class	A2V+G5IV (white/yellow)
Pri motion ra	-001		Sec motion ra
Pri motion dec	-058		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	185.7		Precise sep	0.388		Var name	V505 Sgr		Constellation	Sagittarius
SAO	163080		HIP	97849		Tycho2	5737-00439-1		Gaia DR2	6878492245986475904
HD	187949		HR	7571		BD	BD-14 5578		Distance	119.05
Distance ly	388.34		last precise pa	185.7		last precise sep	0.388

ORBITAL ELEMENTS

Period (P)	343.2y		Periastron (T)	1998.85y		Semi-major axis (a)	0.678a
Eccentricity (e)	0.716		Inclination (i)	126.5°		Longitude of periastron (ω)	73.5°
Node (Ω)	3.3°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox			Last observation	2018

label	rho	theta
2000	0.117	283.5
2001	0.117	268.7
2002	0.124	254.9
2003	0.136	243.0
2004	0.151	233.2
2005	0.168	225.3
2006	0.186	218.9
2007	0.204	213.6
2008	0.223	209.2
2009	0.241	205.5
2010	0.259	202.3
2011	0.277	199.5
2012	0.293	197.0
2013	0.310	194.8
2014	0.325	192.8
2015	0.341	191.0
2016	0.355	189.4
2017	0.369	187.8
2018	0.383	186.4
2019	0.396	185.1
2020	0.409	183.9
2021	0.421	182.7
2022	0.433	181.6
2023	0.444	180.6
2024	0.455	179.6
2025	0.466	178.6
2026	0.476	177.7
2027	0.486	176.9
2028	0.496	176.0
2029	0.505	175.2
2030	0.514	174.5

grafico orbita

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

wds19531-1436g.png orbit plot

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

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
19531-1436	CHR 90		2006	18	216	0.2	9.25	6.61	A0V+F8IV	NOD	195306.39-143611.1
19531-1436	CHR 90		2009	19	204	0.2	9.25	6.61	A0V+F8IV	NOD	195306.39-143611.1
19531-1436	CHR 90		2010	24	200	0.3	9.25	6.61	A0V+F8IV	NOD	195306.39-143611.1
19531-1436	CHR 90		2015	25	10	0.4	9.25	6.61	A0V+F8IV	NO	195306.39-143611.1
19531-1436	CHR 90		2018	26	186	0.4	9.25	6.61	A0V+F8IV	NO	195306.39-143611.1

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