01316-5322 I   264AB

Coord 2000	01316-5322		Discov num	I   264		Comp	AB		Coord arcsec 2000	01 31 35.29 -53 22 10.1
Date first	1898		Date last	2017		Obs	45
Pa first	130		Pa last	26		P.A. Now (θ)	26.1°
Sep first	0.5		Sep last	0.8		Sep. Now (ρ)	0.9"
Mag pri	8.36		Mag sec	8.84		delta mag (ΔM)	0.48		Spectral class	F5 (yellow-white)
Pri motion ra	+084		Sec motion ra	+084
Pri motion dec	+030		Sec motion dec	+030
Notes	O (Orbital solution)

Visually invisible, K-band or other infrared star This double is physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		232450	01316-5322	I 264	AB	1898	2017	45	26	0.9	8.36	8.84	0.48	Y	<===
Show		232450	01316-5322	HJ 3444	AB,C	1836	2000	9	7	39.0	8.01	11.20	3.19

Triple system
4 visible stars in this system

Precise pa	25.8		Precise sep	0.793		Constellation	Eridanus		SAO	232450
HIP	7111		Tycho2	8475-01039-1		Gaia DR2	60562750720		HD	9438
CP	CP-54 342		Distance	101.52		Distance ly	331.16		last precise pa	25.8
last precise sep	0.793

Period (P)	250y		Periastron (T)	1889.5y		Semi-major axis (a)	1.46a
Eccentricity (e)	0.892		Inclination (i)	107.4°		Longitude of periastron (ω)	276.9°
Node (Ω)	141°		Note			Grade	5	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	1995

label rho theta 2000 0.841 37.1 2001 0.844 36.5 2002 0.847 35.9 2003 0.850 35.3 2004 0.853 34.7 2005 0.856 34.2 2006 0.859 33.6 2007 0.862 33.0 2008 0.865 32.5 2009 0.868 31.9 2010 0.871 31.4 2011 0.874 30.8 2012 0.877 30.3 2013 0.880 29.8 2014 0.883 29.2 2015 0.886 28.7 2016 0.889 28.2 2017 0.892 27.7 2018 0.895 27.1 2019 0.898 26.6 2020 0.901 26.1 2021 0.904 25.6 2022 0.907 25.1 2023 0.910 24.6 2024 0.912 24.1 2025 0.915 23.6 2026 0.918 23.1 2027 0.921 22.6 2028 0.924 22.1 2029 0.927 21.6 2030 0.929 21.2 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
01316-5322	I 264	AB	1995	36	222	0.8	8.36	8.84	F5	OD	013135.29-532210.1
01316-5322	I 264	AB	2008	37	32	0.8	8.36	8.84	F5	OD	013135.29-532210.1
01316-5322	I 264	AB	2009	39	32	0.8	8.36	8.84	F5	OD	013135.29-532210.1
01316-5322	I 264	AB	2013	43	29	0.8	8.36	8.84	F5	O	013135.29-532210.1
01316-5322	I 264	AB	2016	44	26	0.8	8.36	8.84	F5	O	013135.29-532210.1
01316-5322	I 264	AB	2017	45	26	0.8	8.36	8.84	F5	O	013135.29-532210.1

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