09128-6055 HDO 207AB

Coord 2000	09128-6055		Discov num	HDO 207		Comp	AB		Coord arcsec 2000	09 12 50.63 -60 55 00.5
Date first	1915		Date last	2018		Obs	45
Pa first	53		Pa last	114		P.A. Now (θ)	122.2°
Sep first	0.3		Sep last	0.1		Sep. Now (ρ)	0.13"
Mag pri	6.97		Mag sec	7.27		delta mag (ΔM)	0.3		Spectral class	B9V (blue-white)
Pri motion ra	-022		Sec motion ra
Pri motion dec	+019		Sec motion dec
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		250485	09 12 51 -60 55 00	CHR 144 Aa,Ab	1989	1	35	0.0	6.50
Show		250485	09 12 51 -60 55 00	HDO 207 AB	2018	45	122	0.1	6.97	7.27	0.30	Y	<===

Triple system
2 visible stars in this system

Precise pa	113.6		Precise sep	0.126		Constellation	Carina		SAO	250485
HIP	45214		Tycho2	8940-02645-1		Gaia DR2	5299769848327101184		HD	79699
CP	CP-60 1353		Distance	173.31		Distance ly	565.34		last precise pa	113.6
last precise sep	0.126

Period (P)	400y	± 30	Periastron (T)	1960.65y	± 1.65	Semi-major axis (a)	0.548a	± 0.007
Eccentricity (e)	0.538	± 0.05	Inclination (i)	76.4°	± 1.5	Longitude of periastron (ω)	149°	± 5
Node (Ω)	223.7°	± 1.5	Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2013

label rho theta 2000 0.195 70.7 2001 0.190 72.1 2002 0.185 73.7 2003 0.180 75.3 2004 0.176 77.0 2005 0.171 78.7 2006 0.167 80.6 2007 0.162 82.6 2008 0.158 84.7 2009 0.154 86.9 2010 0.150 89.2 2011 0.146 91.7 2012 0.143 94.2 2013 0.140 96.9 2014 0.137 99.7 2015 0.134 102.7 2016 0.132 105.7 2017 0.130 108.8 2018 0.128 112.1 2019 0.127 115.4 2020 0.126 118.8 2021 0.125 122.2 2022 0.125 125.6 2023 0.126 129.0 2024 0.126 132.4 2025 0.127 135.7 2026 0.129 139.0 2027 0.131 142.1 2028 0.133 145.2 2029 0.136 148.2 2030 0.139 151.0		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
09128-6055	HDO 207	AB	2006	38	80	0.2	6.97	7.27		NO	091250.63-605500.5
09128-6055	HDO 207	AB	2009	39	87	0.2	6.97	7.27		NO	091250.63-605500.5
09128-6055	HDO 207	AB	2010	40	91	0.1	6.97	7.27		NO	091250.63-605500.5
09128-6055	HDO 207	AB	2013	41	97	0.1	6.97	7.27	B9V	NO	091250.63-605500.5
09128-6055	HDO 207	AB	2016	43	110	0.1	6.97	7.27	B9V	NO	091250.63-605500.5
09128-6055	HDO 207	AB	2018	45	114	0.1	6.97	7.27	B9V	NO	091250.63-605500.5

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