19553-0644 STF2597AB

Coord 2000	19553-0644		Discov num	STF2597		Comp	AB		Coord arcsec 2000	19 55 19.49 -06 44 04.7
Date first	1826		Date last	2017		Obs	142
Pa first	92		Pa last	101		P.A. Now (θ)	99.6°
Sep first	1.9		Sep last	0.6		Sep. Now (ρ)	0.74"
Mag pri	6.94		Mag sec	7.98		delta mag (ΔM)	1.04		Spectral class	F2V (yellow-white)
Pri motion ra	+030		Sec motion ra
Pri motion dec	-062		Sec motion dec
Notes	N O (See Notes, Orbital solution)

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

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		143911	19553-0644	STF2597	AB	1826	2017	142	100	0.7	6.94	7.98	1.04	Y	<===
Show		143911	19553-0644	BOW 8	AC	-1	-1	0			6.94

Triple system
3 visible stars in this system

Precise pa	100.8		Precise sep	0.647		Constellation	Aquila		SAO	143911
HIP	98038		Tycho2	5159-02691-1		Gaia DR2	88186245504		HD	188405
HR	7599		ADS	13104		BD	BD-07 5102		Distance	81.83
Distance ly	266.93		last precise pa	100.8		last precise sep	0.647

Period (P)	425y	± 22	Periastron (T)	1974.28y	± 0.23	Semi-major axis (a)	1.085a	± 0.024
Eccentricity (e)	0.9414	± 0.002	Inclination (i)	103.05°	± 0.84	Longitude of periastron (ω)	327.9°	± 1.7
Node (Ω)	264.03°	± 0.77	Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation

label rho theta 2000 0.445 104.1 2001 0.461 103.7 2002 0.478 103.4 2003 0.494 103.1 2004 0.510 102.8 2005 0.525 102.5 2006 0.541 102.2 2007 0.556 102.0 2008 0.571 101.7 2009 0.586 101.5 2010 0.601 101.3 2011 0.616 101.1 2012 0.630 100.9 2013 0.644 100.7 2014 0.658 100.5 2015 0.672 100.3 2016 0.686 100.2 2017 0.700 100.0 2018 0.713 99.9 2019 0.727 99.7 2020 0.740 99.6 2021 0.753 99.4 2022 0.766 99.3 2023 0.779 99.2 2024 0.791 99.1 2025 0.804 98.9 2026 0.816 98.8 2027 0.829 98.7 2028 0.841 98.6 2029 0.853 98.5 2030 0.865 98.4 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
19553-0644	STF2597	AB	2006	133	102	0.5	6.94	7.98	F2V	NOD	195519.49-064404.7
19553-0644	STF2597	AB	2008	135	101	0.6	6.94	7.98	F2V	NOD	195519.49-064404.7
19553-0644	STF2597	AB	2010	138	101	0.6	6.94	7.98	F2V	NOD	195519.49-064404.7
19553-0644	STF2597	AB	2014	139	99	0.7	6.94	7.98	F2V	NO	195519.49-064404.7
19553-0644	STF2597	AB	2017	142	101	0.6	6.94	7.98	F2V	NO	195519.49-064404.7

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