19398-2326 SEE 389 (53 Sgr)

Coord 2000	19398-2326		Discov num	SEE 389		Comp			Coord arcsec 2000	19 39 49.46 -23 25 39.4
Date first	1897		Date last	2017		Obs	36
Pa first	332		Pa last	333		P.A. Now (θ)	330.3°
Sep first	0.2		Sep last	0.1		Sep. Now (ρ)	0.17"
Mag pri	6.80		Mag sec	7.51		delta mag (ΔM)	0.71		Spectral class	A0V (white)
Pri motion ra	+006		Sec motion ra
Pri motion dec	-037		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

Precise pa	333		Precise sep	0.132		Name	53 Sgr		Constellation	Sagittarius
SAO	188407		HIP	96729		Tycho2	6889-02260-1		Gaia DR2	63020310656
HD	185404		HR	7470		GC	27189		ADS	12741
CD	CD-2315618		CP	CP-23 7543		Flamsteed	53 Sagittarii		Flamsteed name	53 Sgr
Distance	98.72		Distance ly	322.02		last precise pa	333		last precise sep	0.132

Period (P)	46.2y	± 0.1	Periastron (T)	1976.63y	± 0.6	Semi-major axis (a)	0.221a	± 0.001
Eccentricity (e)	0.088	± 0.007	Inclination (i)	93.5°	± 0.2	Longitude of periastron (ω)	0.4°	± 4.7
Node (Ω)	327.9°	± 0.3	Note			Grade	2	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2014

label rho theta 2000 0.240 147.8 2001 0.237 147.4 2002 0.231 146.9 2003 0.222 146.5 2004 0.209 146.0 2005 0.193 145.4 2006 0.174 144.7 2007 0.153 143.9 2008 0.129 142.7 2009 0.103 141.0 2010 0.076 138.0 2011 0.047 131.6 2012 0.021 107.4 2013 0.020 10.6 2014 0.046 344.1 2015 0.074 337.4 2016 0.101 334.3 2017 0.126 332.5 2018 0.149 331.3 2019 0.168 330.3 2020 0.183 329.6 2021 0.194 328.9 2022 0.200 328.4 2023 0.201 327.8 2024 0.198 327.2 2025 0.190 326.6 2026 0.177 325.9 2027 0.160 325.1 2028 0.139 324.1 2029 0.116 322.6 2030 0.090 320.4 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
19398-2326	SEE 389		1991	29	333	0.1	6.80	7.51	A0V	NO	193949.46-232539.4
19398-2326	SEE 389		2008	33	322	0.1	6.80	7.51	A0V	NO	193949.46-232539.4
19398-2326	SEE 389		2014	33	337	0.1	6.80	7.51	A0V	NO	193949.46-232539.4
19398-2326	SEE 389		2015	34	336	0.1	6.80	7.51	A0V	NO	193949.46-232539.4
19398-2326	SEE 389		2017	36	333	0.1	6.80	7.51	A0V	NO	193949.46-232539.4

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