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	2016		Obs	43
Pa first	53		Pa last	110		P.A. Now (θ)	115.4°
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_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		250485	09128-6055	CHR 144	Aa,Ab	1989	1989	1	35	0.0	6.50
Show		250485	09128-6055	HDO 207	AB	1915	2016	43	115	0.1	6.97	7.27	0.30	Y	<===

Triple system
2 visible stars in this system

Precise pa	109.5		Precise sep	0.13		Constellation	Carina		SAO	250485
HIP	45214		Tycho2	8940-02645-1		HD	79699		CP	CP-60 1353
Distance	173.31		Distance ly	565.34		last precise pa	109.5		last precise sep	0.13

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

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