00219-2300 RST5493BC

Coord 2000	00219-2300		Discov num	RST5493		Comp	BC		Coord arcsec 2000	00 21 52.67 -23 00 23.2
Date first	1949		Date last	2020		Obs	13
Pa first	91		Pa last	93		P.A. Now (θ)	91.7°
Sep first	0.2		Sep last	0.1		Sep. Now (ρ)	0.1"
Mag pri	9.90		Mag sec	9.90		delta mag (ΔM)	0		Spectral class
Pri motion ra	+133		Sec motion ra	+133
Pri motion dec	-115		Sec motion dec	-115
Notes	N O (See Notes, Orbital solution)

This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		166213	00 21 52 -23 00 28	HJ 1957 A,BC	2016	44	27	6.1	7.67	9.15	1.48
Show		166213	00 21 53 -23 00 23	RST 5493 BC	2020	13	92	0.1	9.90	9.90	0.00	Y	<===

Triple system
4 visible stars in this system

Precise pa	92.7		Precise sep	0.094		Spectr	G1V		Constellation	Cetus
SAO	166213		HIP	1732		Tycho2	6413-00769-1		Gaia DR2	2360329587101891072
HD	1766		ADS	302		CD	CD-23 111		Distance	59.49
Distance ly	194.06		last precise pa	92.7		last precise sep	0.094

Period (P)	18.44y	± 0.56	Periastron (T)	2019.53y	± 0.45	Semi-major axis (a)	0.134a	± 0.02
Eccentricity (e)	0.831	± 0.034	Inclination (i)	92.1°	± 1.7	Longitude of periastron (ω)	213.6°	± 16
Node (Ω)	91.3°	± 1.5	Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2021

label rho theta 2000 0.008 67.0 2001 0.024 271.3 2002 0.069 92.2 2003 0.124 91.4 2004 0.158 91.1 2005 0.182 90.8 2006 0.198 90.6 2007 0.207 90.4 2008 0.211 90.3 2009 0.211 90.1 2010 0.207 90.0 2011 0.198 89.8 2012 0.186 89.6 2013 0.170 89.4 2014 0.150 89.1 2015 0.126 88.7 2016 0.098 88.1 2017 0.065 87.0 2018 0.026 82.9 2019 0.017 277.2 2020 0.033 93.6 2021 0.103 91.7 2022 0.145 91.2 2023 0.173 90.9 2024 0.192 90.7 2025 0.204 90.5 2026 0.210 90.4 2027 0.212 90.2 2028 0.209 90.0 2029 0.202 89.9 2030 0.192 89.7		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
00219-2300	RST5493	BC	1978	6	90	0.1	9.90	9.90			002106.67-230000.0
00219-2300	RST5493	BC	2008	7	90	0.2	9.90	9.90			002152.67-230023.2
00219-2300	RST5493	BC	2011	9	90	0.2	9.90	9.90		N	002152.67-230023.2
00219-2300	RST5493	BC	2015	10	88	0.1	9.90	9.90		N	002152.67-230023.2
00219-2300	RST5493	BC	2017	12	85	0.0	9.90	9.90		N	002152.67-230023.2

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