02057-2423 WSI 71 Aa,Ab

Coord 2000	02057-2423		Discov num	WSI  71		Comp	Aa,Ab		Coord arcsec 2000	02 05 41.51 -24 22 33.8
Date first	2008		Date last	2021		Obs	23
Pa first	143		Pa last	213.7		P.A. Now (θ)	213.7°
Sep first	0.0		Sep last	0.025		Sep. Now (ρ)	0.025"
Mag pri	9.27		Mag sec	9.50		delta mag (ΔM)	0.23		Spectral class	G9V+G9V (yellow/yellow)
Pri motion ra	+419		Sec motion ra
Pri motion dec	-064		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		167545	02 05 42 -24 22 34	WSI 71 Aa,Ab	2021	23	214	0.0	9.27	9.50	0.23	Y	<===
Show	HD 12889	167545	02 05 42 -24 22 34	I 454 AB	2021	45	166	0.5	8.62	11.32	2.70	Y
Show		167545	02 05 42 -24 22 34	I 454 AB,C	2015	19	257	56.6	8.62	8.96	0.34

Quintuple system
4 estimated visually detectable stars in this system

Constellation	Fornax		SAO	167545		HIP	9774		Tycho2	6430-00057-1
HD	12889		ADS	1652		CD	CD-24 891		CP	CP-24 237
Distance	46.64		Distance ly	152.14

Period (P)	2.582y	± 0.003	Periastron (T)	2010.917y	± 0.015	Semi-major axis (a)	0.048a	± 0.003
Eccentricity (e)	0.769	± 0.015	Inclination (i)	75.9°	± 4	Longitude of periastron (ω)	287.9°	± 1.5
Node (Ω)	127.2°	± 4.6	Notes	n		Reference	Tok2014b
Equinox	2000		Last observation	2012		Grade	3	(1=Definitive, 9=Indet.)

label theta rho 2000 291.7 0.046 2001 168.5 0.019 2002 275.2 0.036 2003 304.4 0.031 2004 232.8 0.019 2005 287.8 0.045 2006 149.6 0.022 2007 268.0 0.031 2008 298.3 0.041 2009 208.0 0.017 2010 283.5 0.042 2011 131.7 0.019 2012 258.1 0.026 2013 293.9 0.045 2014 181.3 0.018 2015 278.5 0.039 2016 312.0 0.018 2017 243.5 0.022 2018 290.0 0.046 2019 159.4 0.021 2020 272.2 0.034 2021 301.2 0.037 2022 222.3 0.018 2023 285.9 0.044 2024 142.0 0.022 2025 264.0 0.029 2026 296.2 0.044 2027 195.7 0.017 2028 281.3 0.041 2029 106.5 0.007 2030 252.2 0.024		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic