19449-2338 MTG   4

Coord 2000	19449-2338		Discov num	MTG   4		Comp			Coord arcsec 2000	19 44 53.80 -23 37 59.3
Date first	2004		Date last	2019		Obs	8
Pa first	355		Pa last	329		P.A. Now (θ)	325.8°
Sep first	0.8		Sep last	0.4		Sep. Now (ρ)	0.33"
Mag pri	14.60		Mag sec	15.30		delta mag (ΔM)	0.7		Spectral class	M4.5V (red)
Pri motion ra	+320		Sec motion ra
Pri motion dec	-167		Sec motion dec
Notes	N O (See Notes, Orbital solution)

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

Precise pa	328.9		Precise sep	0.387		Constellation	Sagittarius		last precise pa	328.9
last precise sep	0.387

Period (P)	33y	± 2.6	Periastron (T)	2023.21y	± 0.55	Semi-major axis (a)	0.459a	± 0.015
Eccentricity (e)	0.804	± 0.056	Inclination (i)	123.2°	± 9	Longitude of periastron (ω)	359°	± 19
Node (Ω)	171.7°	± 8.7	Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2015

label rho theta 2000 0.714 0.3 2001 0.746 358.9 2002 0.772 357.6 2003 0.793 356.4 2004 0.809 355.3 2005 0.820 354.1 2006 0.826 353.0 2007 0.828 351.9 2008 0.824 350.8 2009 0.816 349.7 2010 0.803 348.6 2011 0.785 347.4 2012 0.761 346.1 2013 0.732 344.8 2014 0.697 343.3 2015 0.656 341.7 2016 0.608 339.8 2017 0.553 337.6 2018 0.489 334.9 2019 0.416 331.2 2020 0.331 325.8 2021 0.232 316.1 2022 0.123 289.9 2023 0.086 192.4 2024 0.086 87.8 2025 0.182 36.9 2026 0.285 22.6 2027 0.376 15.7 2028 0.454 11.3 2029 0.521 8.1 2030 0.580 5.7 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
19449-2338	MTG 4		2005	2	353	0.8	9.00	9.10		K	194453.80-233759.3
19449-2338	MTG 4		2010	3	348	0.8	9.00	9.10		K	194453.80-233759.3
19449-2338	MTG 4		2014	4	342	0.7	9.00	9.10		K	194453.80-233759.3
19449-2338	MTG 4		2015	5	341	0.6	9.00	9.10		K	194453.80-233759.3
19449-2338	MTG 4		2017	6	336	0.5	14.60	15.30	M4.5V	NO	194453.80-233759.3
19449-2338	MTG 4		2018	7	334	0.5	14.60	15.30	M4.5V	NO	194453.80-233759.3
19449-2338	MTG 4		2019	8	329	0.4	14.60	15.30	M4.5V	NO	194453.80-233759.3

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