20002-5522 B   459BC

Coord 2000	20002-5522		Discov num	B   459		Comp	BC		Coord arcsec 2000	20 00 14.72 -55 22 25.0
Date first	1926		Date last	2017		Obs	15
Pa first	129		Pa last	204		P.A. Now (θ)	208.8°
Sep first	0.3		Sep last	0.3		Sep. Now (ρ)	0.29"
Mag pri	10.98		Mag sec	11.07		delta mag (ΔM)	0.09		Spectral class	K1+K1 (yellow-orange/yellow-orange)
Pri motion ra	-014		Sec motion ra	-014
Pri motion dec	+002		Sec motion dec	+002
Notes	N O (See Notes, Orbital solution)

This double is physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show			20002-5522	I 1041	A,BC	1910	2017	19	41	1.4	9.69	10.20	0.51
Show			20002-5522	B 459	BC	1926	2017	15	209	0.3	10.98	11.07	0.09	Y	<===

Triple system
4 visible stars in this system

Precise pa	204.2		Precise sep	0.284		Constellation	Telescopium		SAO	246378
HIP	98457		Tycho2	8780-00272-1		Gaia DR2	01202399104		HD	188908
CP	CP-55 9275		Distance	68.78		Distance ly	224.36		last precise pa	204.2
last precise sep	0.284

Period (P)	72.78y	± 1.2	Periastron (T)	2044.56y	± 0.5	Semi-major axis (a)	0.292a	± 0.002
Eccentricity (e)	0.229	± 0.005	Inclination (i)	44.9°	± 2	Longitude of periastron (ω)	278.7°	± 3
Node (Ω)	64.6°	± 1	Note			Grade	2	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2015

label rho theta 2000 0.258 130.1 2001 0.256 134.5 2002 0.254 139.0 2003 0.253 143.5 2004 0.253 148.0 2005 0.253 152.6 2006 0.254 157.1 2007 0.255 161.6 2008 0.257 166.0 2009 0.259 170.4 2010 0.262 174.7 2011 0.265 178.9 2012 0.268 183.0 2013 0.272 187.0 2014 0.275 190.9 2015 0.279 194.7 2016 0.283 198.3 2017 0.287 201.9 2018 0.290 205.4 2019 0.294 208.8 2020 0.296 212.2 2021 0.299 215.5 2022 0.301 218.7 2023 0.302 221.9 2024 0.303 225.1 2025 0.302 228.2 2026 0.301 231.4 2027 0.299 234.7 2028 0.296 238.0 2029 0.292 241.3 2030 0.286 244.8 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
20002-5522	B 459	BC	1991	13	95	0.3	10.98	11.07		O	200014.72-552225.0
20002-5522	B 459	BC	2015	14	197	0.3	10.98	11.07	K1IV	NO	200014.72-552225.0
20002-5522	B 459	BC	2017	15	204	0.3	10.98	11.07	K1+K1	NO	200014.72-552225.0

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