20267-4334 I  1420

Coord 2000	20267-4334		Discov num	I  1420		Comp			Coord arcsec 2000	20 26 44.38 -43 33 56.4
Date first	1925		Date last	2019		Obs	25
Pa first	344		Pa last	358		P.A. Now (θ)	358.4°
Sep first	0.7		Sep last	0.3		Sep. Now (ρ)	0.3"
Mag pri	9.38		Mag sec	9.61		delta mag (ΔM)	0.23		Spectral class	K0V (yellow-orange)
Pri motion ra	+120		Sec motion ra
Pri motion dec	-114		Sec motion dec
Notes	O (Orbital solution)

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

Precise pa	358.3		Precise sep	0.302		Constellation	Sagittarius		SAO	230207
HIP	100836		Tycho2	7961-01417-1		Gaia DR2	45511522048		HD	194327
CD	CD-4313984		CP	CP-43 9228		Distance	45.54		Distance ly	148.55
last precise pa	358.3		last precise sep	0.302

Period (P)	77.81y		Periastron (T)	1981.04y		Semi-major axis (a)	0.446a
Eccentricity (e)	0.336		Inclination (i)	79.3°		Longitude of periastron (ω)	61.6°
Node (Ω)	159.3°		Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2018

label rho theta 2000 0.485 340.4 2001 0.492 341.1 2002 0.496 341.7 2003 0.498 342.4 2004 0.498 343.0 2005 0.496 343.7 2006 0.492 344.3 2007 0.487 345.0 2008 0.480 345.7 2009 0.471 346.4 2010 0.461 347.1 2011 0.450 347.9 2012 0.437 348.7 2013 0.423 349.6 2014 0.408 350.5 2015 0.392 351.5 2016 0.375 352.6 2017 0.357 353.8 2018 0.338 355.2 2019 0.319 356.7 2020 0.299 358.4 2021 0.278 0.3 2022 0.257 2.5 2023 0.236 5.2 2024 0.214 8.4 2025 0.193 12.3 2026 0.172 17.1 2027 0.153 23.2 2028 0.135 31.0 2029 0.120 41.0 2030 0.110 53.2 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
20267-4334	I 1420		1991	20	152	0.3	9.38	9.61	K0V	OD	202644.38-433356.4
20267-4334	I 1420		2008	21	346	0.5	9.38	9.61	K0V	OD	202644.38-433356.4
20267-4334	I 1420		2010	22	347	0.4	9.38	9.61	K0V	OD	202644.38-433356.4
20267-4334	I 1420		2017	23	355	0.3	9.38	9.61	K0V	O	202644.38-433356.4
20267-4334	I 1420		2018	24	356	0.3	9.38	9.61	K0V	O	202644.38-433356.4
20267-4334	I 1420		2019	25	358	0.3	9.38	9.61	K0V	O	202644.38-433356.4

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