09074-4357 B  1646AB

Coord 2000	09074-4357		Discov num	B  1646		Comp	AB		Coord arcsec 2000	09 07 23.26 -43 57 18.3
Date first	1929		Date last	2019		Obs	8
Pa first	24		Pa last	281		P.A. Now (θ)	266.8°
Sep first	0.3		Sep last	0.0		Sep. Now (ρ)	0.04"
Mag pri	9.50		Mag sec	9.90		delta mag (ΔM)	0.4		Spectral class	A5/7II (white)
Pri motion ra	-010		Sec motion ra
Pri motion dec	+001		Sec motion dec
Notes

Nature of this double is uncertain.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		220870	09074-4357	B 1646	AB	1929	2019	8	267	0.0	9.50	9.90	0.40	Y	<===
Show		220870	09074-4357	HJ 4180	AB,C	1836	2015	9	128	22.1	8.55	10.09	1.54

Triple system
4 visible stars in this system

Precise pa	281.2		Precise sep	0.043		Constellation	Vela		SAO	220870
Tycho2	7689-02574-1		Gaia DR2	01595081216		HD	78547		last precise pa	281.2
last precise sep	0.043

Period (P)	208y		Periastron (T)	2029.45y		Semi-major axis (a)	0.188a
Eccentricity (e)	0.6		Inclination (i)	116.2°		Longitude of periastron (ω)	161.1°
Node (Ω)	15.9°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2019

label rho theta 2000 0.149 356.8 2001 0.143 355.8 2002 0.138 354.7 2003 0.133 353.5 2004 0.127 352.2 2005 0.121 350.8 2006 0.115 349.3 2007 0.109 347.5 2008 0.103 345.6 2009 0.097 343.5 2010 0.091 341.1 2011 0.085 338.3 2012 0.079 335.1 2013 0.073 331.3 2014 0.067 326.9 2015 0.062 321.7 2016 0.056 315.5 2017 0.052 308.1 2018 0.048 299.3 2019 0.045 289.3 2020 0.044 278.3 2021 0.043 266.8 2022 0.045 255.6 2023 0.047 245.4 2024 0.051 236.4 2025 0.055 228.6 2026 0.059 221.9 2027 0.063 216.1 2028 0.067 211.0 2029 0.071 206.4 2030 0.073 202.2 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
09074-4357	B 1646	AB	1993	5	2	0.2	9.50	9.90	A5/7II		090723.26-435718.3
09074-4357	B 1646	AB	2018	6	300	0.0	9.50	9.90	A5/7II		090723.26-435718.3
09074-4357	B 1646	AB	2019	8	281	0.0	9.50	9.90	A5/7II		090723.26-435718.3

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