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	2018		Obs	24
Pa first	344		Pa last	356		P.A. Now (θ)	351.9°
Sep first	0.7		Sep last	0.3		Sep. Now (ρ)	0.39"
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)

This double is physical.

Precise pa	355.9		Precise sep	0.33		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	355.9		last precise sep	0.33

Period (P)	81.5y		Periastron (T)	1980.4y		Semi-major axis (a)	0.457a
Eccentricity (e)	0.353		Inclination (i)	79.9°		Longitude of periastron (ω)	56.8°
Node (Ω)	159.3°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox			Last observation	1991

label rho theta 2000 0.501 339.6 2001 0.510 340.2 2002 0.517 340.8 2003 0.522 341.3 2004 0.525 341.9 2005 0.526 342.4 2006 0.525 343.0 2007 0.523 343.5 2008 0.519 344.1 2009 0.513 344.7 2010 0.506 345.2 2011 0.498 345.8 2012 0.489 346.5 2013 0.478 347.1 2014 0.466 347.8 2015 0.452 348.5 2016 0.438 349.3 2017 0.423 350.1 2018 0.407 351.0 2019 0.390 351.9 2020 0.372 353.0 2021 0.353 354.1 2022 0.334 355.4 2023 0.314 356.8 2024 0.294 358.5 2025 0.273 0.4 2026 0.252 2.6 2027 0.230 5.2 2028 0.209 8.3 2029 0.188 12.2 2030 0.167 17.0 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

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